nail.h

   1 /*@ S-nail - a mail user agent derived from Berkeley Mail.
   2  *@ Header inclusion, macros, constants, types and the global var declarations.
   3  *
   4  * Copyright (c) 2000-2004 Gunnar Ritter, Freiburg i. Br., Germany.
   5  * Copyright (c) 2012 - 2015 Steffen (Daode) Nurpmeso <sdaoden@users.sf.net>.
   6  */
   7 /*
   8  * Copyright (c) 1980, 1993
   9  *      The Regents of the University of California.  All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 /*
  37  * Mail -- a mail program
  38  *
  39  * Author: Kurt Shoens (UCB) March 25, 1978
  40  */
  41
  42 #include "config.h"
  43
  44 #include <sys/stat.h>
  45 #include <sys/types.h>
  46
  47 #ifdef HAVE_GETTIMEOFDAY
  48 # include <sys/time.h>
  49 #endif
  50
  51 #include <errno.h>
  52 #include <fcntl.h>
  53 #include <limits.h>
  54 #include <setjmp.h>
  55 #include <signal.h>
  56 #include <stdarg.h>
  57 #include <stdio.h>
  58 #include <stdlib.h>
  59 #include <string.h>
  60 #include <termios.h>
  61 #include <time.h>
  62 #include <unistd.h>
  63
  64 #if defined __STDC_VERSION__ && __STDC_VERSION__ + 0 >= 199901L
  65 # include <stdint.h>
  66 #else
  67 # include <inttypes.h>
  68 #endif
  69
  70 #ifdef HAVE_C90AMEND1
  71 # include <wchar.h>
  72 # include <wctype.h>
  73 #endif
  74 #ifdef HAVE_DEBUG
  75 # include <assert.h>
  76 #endif
  77 #ifdef HAVE_ICONV
  78 # include <iconv.h>
  79 #endif
  80 #ifdef HAVE_REGEX
  81 # include <regex.h>
  82 #endif
  83
  84 #ifdef HAVE_OPENSSL_MD5
  85 # include <openssl/md5.h>
  86 #endif
  87
  88 /*
  89  * Constants, some nail-specific macros
  90  */
  91
  92 #if !defined NI_MAXHOST
  93 # define NI_MAXHOST     1025
  94 #endif
  95
  96 /* TODO PATH_MAX: fixed-size buffer is always wrong (think NFS) */
  97 #ifndef PATH_MAX
  98 # ifdef MAXPATHLEN
  99 #  define PATH_MAX      MAXPATHLEN
 100 # else
 101 #  define PATH_MAX      1024        /* _XOPEN_PATH_MAX POSIX 2008/Cor 1-2013 */
 102 # endif
 103 #endif
 104
 105 #ifndef HOST_NAME_MAX
 106 # ifdef _POSIX_HOST_NAME_MAX
 107 #  define HOST_NAME_MAX _POSIX_HOST_NAME_MAX
 108 # else
 109 #  define HOST_NAME_MAX 255
 110 # endif
 111 #endif
 112
 113 #ifndef NAME_MAX
 114 # ifdef _POSIX_NAME_MAX
 115 #  define NAME_MAX      _POSIX_NAME_MAX
 116 # else
 117 #  define NAME_MAX      14
 118 # endif
 119 #endif
 120 #if NAME_MAX < 8
 121 # error NAME_MAX too small
 122 #endif
 123
 124 #ifndef STDIN_FILENO
 125 # define STDIN_FILENO   0
 126 #endif
 127 #ifndef STDOUT_FILENO
 128 # define STDOUT_FILENO  1
 129 #endif
 130 #ifndef STDERR_FILENO
 131 # define STDERR_FILENO  2
 132 #endif
 133
 134 #ifdef NSIG_MAX
 135 # undef NSIG
 136 # define NSIG           NSIG_MAX
 137 #elif !defined NSIG
 138 # define NSIG           ((sizeof(sigset_t) * 8) - 1)
 139 #endif
 140
 141 #ifdef O_CLOEXEC
 142 # define _O_CLOEXEC        O_CLOEXEC
 143 # define _CLOEXEC_SET(FD)  do {;} while(0)
 144 #else
 145 # define _O_CLOEXEC        0
 146 # define _CLOEXEC_SET(FD)  \
 147    do { (void)fcntl((FD), F_SETFD, FD_CLOEXEC); } while (0)
 148 #endif
 149
 150 /*  */
 151
 152 #if BUFSIZ + 0 > 2560               /* TODO simply use BUFSIZ? */
 153 # define LINESIZE       BUFSIZ      /* max readable line width */
 154 #else
 155 # define LINESIZE       2560
 156 #endif
 157 #define BUFFER_SIZE     (BUFSIZ >= (1u << 13) ? BUFSIZ : (1u << 14))
 158
 159 /* Network protocol newline */
 160 #define NETNL           "\015\012"
 161 #define NETLINE(X)      X NETNL
 162
 163 /* Number of Not-Yet-Dead calls that are remembered */
 164 #if defined HAVE_DEBUG || defined HAVE_DEVEL || defined HAVE_NYD2
 165 # ifdef HAVE_NYD2
 166 #  define NYD_CALLS_MAX (25 * 84)
 167 # elif defined HAVE_DEVEL
 168 #  define NYD_CALLS_MAX (25 * 42)
 169 # else
 170 #  define NYD_CALLS_MAX (25 * 10)
 171 # endif
 172 #endif
 173
 174 #define APPEND                   /* New mail goes to end of mailbox */
 175 #define CBAD            (-15555)
 176 #define DOTLOCK_TRIES   5        /* Number of open(2) calls for dotlock */
 177 #define FILE_LOCK_TRIES 10       /* Maximum tries before file_lock() fails */
 178 #define ERRORS_MAX      1000     /* Maximum error ring entries TODO configable*/
 179 #define ESCAPE          '~'      /* Default escape for sending */
 180 #define FIO_STACK_SIZE  20       /* Maximum recursion for sourcing */
 181 #define HIST_SIZE       242      /* tty.c: history list default size */
 182 #define HSHSIZE         23       /* Hash prime TODO make dynamic, obsolete */
 183 #define MAXARGC         1024     /* Maximum list of raw strings */
 184 #define MAXEXP          25       /* Maximum expansion of aliases */
 185 #define PROMPT_BUFFER_SIZE 80    /* getprompt() bufsize (> 3!) */
 186 #define REFERENCES_MAX  20       /* Maximum entries in References: */
 187 #define FTMP_OPEN_TRIES 10       /* Maximum number of Ftmp() open(2) tries */
 188
 189 #define ACCOUNT_NULL    "null"   /* Name of "null" account */
 190 #define MAILRC          "~/.mailrc"
 191 #define NETRC           "~/.netrc"
 192 #define TMPDIR_FALLBACK "/tmp"
 193
 194 /* Some environment variables for pipe hooks */
 195 #define AGENT_USER      "NAIL_USER"
 196 #define AGENT_USER_ENC  "NAIL_USER_ENC"
 197 #define AGENT_HOST      "NAIL_HOST"
 198 #define AGENT_HOST_PORT "NAIL_HOST_PORT"
 199
 200 /* Colour stuff */
 201 #ifdef HAVE_COLOUR
 202 # define n_COLOUR(X)       X
 203 #else
 204 # define n_COLOUR(X)
 205 #endif
 206
 207 /* The n_COLOUR_TERMS is in addition to those which have "color" in their name!
 208  * (Keep in SYNC: ./nail.h:n_COLOUR_TERMS, ./nail.1:*colour-terms*"!) */
 209 #define n_COLOUR_TERMS     \
 210    "aterm,cons25,gnome,konsole,kterm,linux,"\
 211    "rxvt,rxvt-unicode,screen,sun,vt100,vt220,wsvt25,xterm"
 212
 213 /* Special FD requests for run_command() / start_command() */
 214 #define COMMAND_FD_PASS -1
 215 #define COMMAND_FD_NULL -2
 216
 217 /*  */
 218 #define FROM_DATEBUF    64    /* Size of RFC 4155 From_ line date */
 219 #define DATE_DAYSYEAR   365L
 220 #define DATE_SECSMIN    60L
 221 #define DATE_MINSHOUR   60L
 222 #define DATE_HOURSDAY   24L
 223 #define DATE_SECSDAY    (DATE_SECSMIN * DATE_MINSHOUR * DATE_HOURSDAY)
 224
 225 /* *indentprefix* default as of POSIX */
 226 #define INDENT_DEFAULT  "\t"
 227
 228 /* Default *encoding* as enum mime_enc below */
 229 #define MIME_DEFAULT_ENCODING MIMEE_QP
 230
 231 /* Maximum allowed line length in a mail before QP folding is necessary), and
 232  * the real limit we go for */
 233 #define MIME_LINELEN_MAX   998   /* Plus CRLF */
 234 #define MIME_LINELEN_LIMIT (MIME_LINELEN_MAX - 48)
 235
 236 /* Ditto, SHOULD */
 237 #define MIME_LINELEN    78    /* Plus CRLF */
 238
 239 /* And in headers which contain an encoded word according to RFC 2047 there is
 240  * yet another limit; also RFC 2045: 6.7, (5). */
 241 #define MIME_LINELEN_RFC2047 76
 242
 243 /* Locations of mime.types(5) */
 244 #define MIME_TYPES_USR  "~/.mime.types"
 245 #define MIME_TYPES_SYS  "/etc/mime.types"
 246
 247 /* Fallback MIME charsets, if *charset-7bit* and *charset-8bit* or not set.
 248  * (Keep in SYNC: ./nail.1:"Character sets", ./nail.h:CHARSET_*!) */
 249 #define CHARSET_7BIT    "US-ASCII"
 250 #ifdef HAVE_ICONV
 251 # define CHARSET_8BIT      "UTF-8"
 252 # define CHARSET_8BIT_OKEY charset_8bit
 253 #else
 254 # define CHARSET_8BIT      "ISO-8859-1"
 255 # define CHARSET_8BIT_OKEY ttycharset
 256 #endif
 257
 258 /* Some environment variables for pipe hooks etc. */
 259 #define NAILENV_TMPDIR              "NAIL_TMPDIR"
 260 #define NAILENV_FILENAME            "NAIL_FILENAME"
 261 #define NAILENV_FILENAME_GENERATED  "NAIL_FILENAME_GENERATED"
 262 #define NAILENV_FILENAME_TEMPORARY  "NAIL_FILENAME_TEMPORARY"
 263 #define NAILENV_CONTENT             "NAIL_CONTENT"
 264 #define NAILENV_CONTENT_EVIDENCE    "NAIL_CONTENT_EVIDENCE"
 265
 266 /* Is *W* a quoting (ASCII only) character? */
 267 #define ISQUOTE(W)      \
 268    ((W) == L'>' || (W) == L'|' || (W) == L'}' || (W) == L':')
 269
 270 /* Maximum number of quote characters (not bytes!) that'll be used on
 271  * follow lines when compressing leading quote characters */
 272 #define QUOTE_MAX       42
 273
 274 /* How much spaces should a <tab> count when *quote-fold*ing? (power-of-two!) */
 275 #define QUOTE_TAB_SPACES 8
 276
 277 /* Maximum size of a message that is passed through to the spam system */
 278 #define SPAM_MAXSIZE    420000
 279
 280 /* String dope: dynamic buffer size, and size of the single builtin one that's
 281  * used first; note that these value include the size of the structure */
 282 #define SBUFFER_SIZE    ((0x10000u >> 1u) - 0x400)
 283 #define SBUFFER_BUILTIN (0x10000u >> 1u)
 284
 285 /* These come from the configuration (named Xxy to not clash with sh(1)..) */
 286 #ifndef XSHELL
 287 # define XSHELL         "/bin/sh"
 288 #endif
 289 #ifndef XLISTER
 290 # define XLISTER        "ls"
 291 #endif
 292 #ifndef XPAGER
 293 # define XPAGER         "more"
 294 #endif
 295
 296 /*
 297  * OS, CC support, generic macros etc.
 298  */
 299
 300 /* OS: we're not a library, only set what needs special treatment somewhere */
 301 #define OS_DRAGONFLY    0
 302 #define OS_SOLARIS      0
 303 #define OS_SUNOS        0
 304
 305 #ifdef __DragonFly__
 306 # undef OS_DRAGONFLY
 307 # define OS_DRAGONFLY   1
 308 #elif defined __solaris__ || defined __sun
 309 # if defined __SVR4 || defined __svr4__
 310 #  undef OS_SOLARIS
 311 #  define OS_SOLARIS    1
 312 # else
 313 #  undef OS_SUNOS
 314 #  define OS_SUNOS      1
 315 # endif
 316 #endif
 317
 318 /* CC */
 319 #define CC_CLANG           0
 320 #define PREREQ_CLANG(X,Y)  0
 321 #define CC_GCC             0
 322 #define PREREQ_GCC(X,Y)    0
 323 #define CC_TCC             0
 324 #define PREREQ_TCC(X,Y)    0
 325
 326 #ifdef __clang__
 327 # undef CC_CLANG
 328 # undef PREREQ_CLANG
 329 # define CC_CLANG          1
 330 # define PREREQ_CLANG(X,Y) \
 331    (__clang_major__ + 0 > (X) || \
 332     (__clang_major__ + 0 == (X) && __clang_minor__ + 0 >= (Y)))
 333 # define __EXTEN           __extension__
 334
 335 #elif defined __GNUC__
 336 # undef CC_GCC
 337 # undef PREREQ_GCC
 338 # define CC_GCC            1
 339 # define PREREQ_GCC(X,Y)   \
 340    (__GNUC__ + 0 > (X) || (__GNUC__ + 0 == (X) && __GNUC_MINOR__ + 0 >= (Y)))
 341 # define __EXTEN           __extension__
 342
 343 #elif defined __TINYC__
 344 # undef CC_TCC
 345 # define CC_TCC            1
 346 #endif
 347
 348 #ifndef __EXTEN
 349 # define __EXTEN
 350 #endif
 351
 352 /* Suppress some technical warnings via #pragma's unless developing.
 353  * XXX Wild guesses: clang(1) 1.7 and (OpenBSD) gcc(1) 4.2.1 don't work */
 354 #ifndef HAVE_DEVEL
 355 # if PREREQ_CLANG(3, 4)
 356 #  pragma clang diagnostic ignored "-Wunused-result"
 357 #  pragma clang diagnostic ignored "-Wformat"
 358 # elif PREREQ_GCC(4, 7)
 359 #  pragma GCC diagnostic ignored "-Wunused-local-typedefs"
 360 #  pragma GCC diagnostic ignored "-Wunused-result"
 361 #  pragma GCC diagnostic ignored "-Wformat"
 362 # endif
 363 #endif
 364
 365 /* For injection macros like DBG(), NATCH_CHAR() */
 366 #define COMMA           ,
 367
 368 #define EMPTY_FILE()    typedef int CONCAT(avoid_empty_file__, n_FILE);
 369
 370 /* Pointer to size_t */
 371 #define PTR2SIZE(X)     ((size_t)(uintptr_t)(X))
 372
 373 /* Pointer comparison (types from below) */
 374 #define PTRCMP(A,C,B)   ((uintptr_t)(A) C (uintptr_t)(B))
 375
 376 /* Ditto, compare (maybe mixed-signed) integers cases to T bits, unsigned;
 377  * Note: doesn't sign-extend correctly, that's still up to the caller */
 378 #define UICMP(T,A,C,B)  ((ui ## T ## _t)(A) C (ui ## T ## _t)(B))
 379
 380 /* Align something to a size/boundary that cannot cause just any problem */
 381 #define n_ALIGN(X)      (((X) + 2*sizeof(void*)) & ~((2*sizeof(void*)) - 1))
 382
 383 /* Members in constant array */
 384 #ifndef NELEM
 385 # define NELEM(A)       (sizeof(A) / sizeof(A[0]))
 386 #endif
 387
 388 /* sizeof() for member fields */
 389 #define SIZEOF_FIELD(T,F) sizeof(((T *)NULL)->F)
 390
 391 /* Casts-away (*NOT* cast-away) */
 392 #define UNUSED(X)       ((void)(X))
 393 #define UNCONST(P)      ((void*)(uintptr_t)(void const*)(P))
 394 #define UNVOLATILE(P)   ((void*)(uintptr_t)(void volatile*)(P))
 395 #define UNXXX(T,C,P)    ((T)(uintptr_t)(C)(P))
 396
 397 /* __STDC_VERSION__ is ISO C99, so also use __STDC__, which should work */
 398 #if defined __STDC__ || defined __STDC_VERSION__ /*|| defined __cplusplus*/
 399 # define STRING(X)      #X
 400 # define XSTRING(X)     STRING(X)
 401 # define CONCAT(S1,S2)  _CONCAT(S1, S2)
 402 # define _CONCAT(S1,S2) S1 ## S2
 403 #else
 404 # define STRING(X)      "X"
 405 # define XSTRING        STRING
 406 # define CONCAT(S1,S2)  S1/**/S2
 407 #endif
 408
 409 #if defined __STDC_VERSION__ && __STDC_VERSION__ + 0 >= 199901L
 410 # define n_FIELD_INITN(N) CONCAT(., N) =
 411 # define n_FIELD_INITI(I) [I] =
 412 #else
 413 # define n_FIELD_INITN(N)
 414 # define n_FIELD_INITI(N)
 415 #endif
 416
 417 #if defined __STDC_VERSION__ && __STDC_VERSION__ + 0 >= 199901L
 418 # define VFIELD_SIZE(X)
 419 # define VFIELD_SIZEOF(T,F) (0)
 420 # define VSTRUCT_SIZEOF(T,F) sizeof(T)
 421 #else
 422 # define VFIELD_SIZE(X) \
 423   ((X) == 0 ? sizeof(size_t) \
 424    : ((ssize_t)(X) < 0 ? sizeof(size_t) - ABS(X) : (size_t)(X)))
 425 # define VFIELD_SIZEOF(T,F) SIZEOF_FIELD(T, F)
 426 # define VSTRUCT_SIZEOF(T,F) (sizeof(T) - SIZEOF_FIELD(T, F))
 427 #endif
 428
 429 #if defined __STDC_VERSION__ && __STDC_VERSION__ + 0 >= 199901L
 430 # define HAVE_INLINE
 431 # define INLINE         inline
 432 # define SINLINE        static inline
 433 #elif CC_CLANG || PREREQ_GCC(2, 9)
 434 # define HAVE_INLINE
 435 # define INLINE         static __inline
 436 # define SINLINE        static __inline
 437 #else
 438 # define INLINE
 439 # define SINLINE        static
 440 #endif
 441
 442 #undef __FUN__
 443 #if defined __STDC_VERSION__ && __STDC_VERSION__ + 0 >= 199901L
 444 # define __FUN__        __func__
 445 #elif CC_CLANG || PREREQ_GCC(3, 4)
 446 # define __FUN__        __extension__ __FUNCTION__
 447 #else
 448 # define __FUN__        uagent   /* Something that is not a literal */
 449 #endif
 450
 451 #if defined __predict_true && defined __predict_false
 452 # define LIKELY(X)      __predict_true(X)
 453 # define UNLIKELY(X)    __predict_false(X)
 454 #elif CC_CLANG || PREREQ_GCC(2, 96)
 455 # define LIKELY(X)      __builtin_expect(X, 1)
 456 # define UNLIKELY(X)    __builtin_expect(X, 0)
 457 #else
 458 # define LIKELY(X)      (X)
 459 # define UNLIKELY(X)    (X)
 460 #endif
 461
 462 #undef HAVE_NATCH_CHAR
 463 #undef NATCH_CHAR
 464 #if defined HAVE_SETLOCALE && defined HAVE_C90AMEND1 && defined HAVE_WCWIDTH
 465 # define HAVE_NATCH_CHAR
 466 # define NATCH_CHAR(X)  X
 467 #else
 468 # define NATCH_CHAR(X)
 469 #endif
 470
 471 /* Compile-Time-Assert
 472  * Problem is that some compilers warn on unused local typedefs, so add
 473  * a special local CTA to overcome this */
 474 #define CTA(TEST)       _CTA_1(TEST, n_FILE, __LINE__)
 475 #define LCTA(TEST)      _LCTA_1(TEST, n_FILE, __LINE__)
 476
 477 #if defined __STDC_VERSION__ && __STDC_VERSION__ + 0 >= 201112L
 478 # define n_CTA(T,M) _Static_assert(T, M)
 479 # define n_LCTA(T,M) _Static_assert(T, M)
 480 #else
 481 # define n_CTA(T,M)  _CTA_1(T, n_FILE, __LINE__)
 482 # define n_LCTA(T,M) _LCTA_1(T, n_FILE, __LINE__)
 483 #endif
 484 #define n_CTAV(T) n_CTA(T, "Unexpected value of constant")
 485 #define n_LCTAV(T) n_LCTA(T, "Unexpected value of constant")
 486
 487 #ifdef n_MAIN_SOURCE
 488 # define n_MCTA(T,M) n_CTA(T, M);
 489 #else
 490 # define n_MCTA(T,M)
 491 #endif
 492
 493 #define _CTA_1(T,F,L)   _CTA_2(T, F, L)
 494 #define _CTA_2(T,F,L)  \
 495    typedef char ASSERTION_failed_in_file_## F ## _at_line_ ## L[(T) ? 1 : -1]
 496 #define _LCTA_1(T,F,L)  _LCTA_2(T, F, L)
 497 #define _LCTA_2(T,F,L) \
 498 do {\
 499    typedef char ASSERTION_failed_in_file_## F ## _at_line_ ## L[(T) ? 1 : -1];\
 500    ASSERTION_failed_in_file_## F ## _at_line_ ## L __i_am_unused__;\
 501    UNUSED(__i_am_unused__);\
 502 } while (0)
 503
 504 #define UNINIT(N,V)     N = V
 505
 506 #undef ISPOW2
 507 #define ISPOW2(X)       ((((X) - 1) & (X)) == 0)
 508 #undef MIN
 509 #define MIN(A, B)       ((A) < (B) ? (A) : (B))
 510 #undef MAX
 511 #define MAX(A, B)       ((A) < (B) ? (B) : (A))
 512 #undef ABS
 513 #define ABS(A)          ((A) < 0 ? -(A) : (A))
 514
 515 #undef DBG
 516 #undef NDBG
 517 #ifndef HAVE_DEBUG
 518 # undef assert
 519 # define assert(X)      UNUSED(0)
 520 # define DBG(X)
 521 # define NDBG(X)        X
 522 # define DBGOR(X,Y)     Y
 523 #else
 524 # define DBG(X)         X
 525 # define NDBG(X)
 526 # define DBGOR(X,Y)     X
 527 #endif
 528
 529 /* Translation (init in main.c) */
 530 #undef _
 531 #undef N_
 532 #undef V_
 533 #define _(S)            S
 534 #define N_(S)           S
 535 #define V_(S)           S
 536
 537 /*
 538  * Types
 539  */
 540
 541 #ifdef UINT8_MAX
 542 # define UI8_MAX        UINT8_MAX
 543 # define SI8_MIN        INT8_MIN
 544 # define SI8_MAX        INT8_MAX
 545 typedef uint8_t         ui8_t;
 546 typedef int8_t          si8_t;
 547 #elif UCHAR_MAX != 255
 548 # error UCHAR_MAX must be 255
 549 #else
 550 # define UI8_MAX        UCHAR_MAX
 551 # define SI8_MIN        CHAR_MIN
 552 # define SI8_MAX        CHAR_MAX
 553 typedef unsigned char   ui8_t;
 554 typedef signed char     si8_t;
 555 #endif
 556
 557 #if !defined PRIu8 || !defined PRId8
 558 # undef PRIu8
 559 # undef PRId8
 560 # define PRIu8          "hhu"
 561 # define PRId8          "hhd"
 562 #endif
 563
 564 #ifdef UINT16_MAX
 565 # define UI16_MAX       UINT16_MAX
 566 # define SI16_MIN       INT16_MIN
 567 # define SI16_MAX       INT16_MAX
 568 typedef uint16_t        ui16_t;
 569 typedef int16_t         si16_t;
 570 #elif USHRT_MAX != 0xFFFFu
 571 # error USHRT_MAX must be 0xFFFF
 572 #else
 573 # define UI16_MAX       USHRT_MAX
 574 # define SI16_MIN       SHRT_MIN
 575 # define SI16_MAX       SHRT_MAX
 576 typedef unsigned short  ui16_t;
 577 typedef signed short    si16_t;
 578 #endif
 579
 580 #if !defined PRIu16 || !defined PRId16
 581 # undef PRIu16
 582 # undef PRId16
 583 # if UI16_MAX == UINT_MAX
 584 #  define PRIu16        "u"
 585 #  define PRId16        "d"
 586 # else
 587 #  define PRIu16        "hu"
 588 #  define PRId16        "hd"
 589 # endif
 590 #endif
 591
 592 #ifdef UINT32_MAX
 593 # define UI32_MAX       UINT32_MAX
 594 # define SI32_MIN       INT32_MIN
 595 # define SI32_MAX       INT32_MAX
 596 typedef uint32_t        ui32_t;
 597 typedef int32_t         si32_t;
 598 #elif ULONG_MAX == 0xFFFFFFFFu
 599 # define UI32_MAX       ULONG_MAX
 600 # define SI32_MIN       LONG_MIN
 601 # define SI32_MAX       LONG_MAX
 602 typedef unsigned long int  ui32_t;
 603 typedef signed long int    si32_t;
 604 #elif UINT_MAX != 0xFFFFFFFFu
 605 # error UINT_MAX must be 0xFFFFFFFF
 606 #else
 607 # define UI32_MAX       UINT_MAX
 608 # define SI32_MIN       INT_MIN
 609 # define SI32_MAX       INT_MAX
 610 typedef unsigned int    ui32_t;
 611 typedef signed int      si32_t;
 612 #endif
 613
 614 #if !defined PRIu32 || !defined PRId32
 615 # undef PRIu32
 616 # undef PRId32
 617 # if UI32_MAX == ULONG_MAX
 618 #  define PRIu32        "lu"
 619 #  define PRId32        "ld"
 620 # else
 621 #  define PRIu32        "u"
 622 #  define PRId32        "d"
 623 # endif
 624 #endif
 625
 626 #ifdef UINT64_MAX
 627 # define UI64_MAX       UINT64_MAX
 628 # define SI64_MIN       INT64_MIN
 629 # define SI64_MAX       INT64_MAX
 630 typedef uint64_t        ui64_t;
 631 typedef int64_t         si64_t;
 632 #elif ULONG_MAX <= 0xFFFFFFFFu
 633 # if !defined ULLONG_MAX || (ULLONG_MAX >> 31) < 0xFFFFFFFFu
 634 #  error We need a 64 bit integer
 635 # else
 636 #  define UI64_MAX      ULLONG_MAX
 637 #  define SI64_MIN      LLONG_MIN
 638 #  define SI64_MAX      LLONG_MAX
 639 __EXTEN typedef unsigned long long  ui64_t;
 640 __EXTEN typedef signed long long    si64_t;
 641 # endif
 642 #else
 643 # define UI64_MAX       ULONG_MAX
 644 # define SI64_MIN       LONG_MIN
 645 # define SI64_MAX       LONG_MAX
 646 typedef unsigned long   ui64_t;
 647 typedef signed long     si64_t;
 648 #endif
 649
 650 #if !defined PRIu64 || !defined PRId64 || !defined PRIX64
 651 # undef PRIu64
 652 # undef PRId64
 653 # undef PRIX64
 654 # if defined ULLONG_MAX && UI64_MAX == ULLONG_MAX
 655 #  define PRIu64        "llu"
 656 #  define PRId64        "lld"
 657 #  define PRIX64        "llX"
 658 # else
 659 #  define PRIu64        "lu"
 660 #  define PRId64        "ld"
 661 #  define PRIX64        "lX"
 662 # endif
 663 #endif
 664
 665 /* (So that we can use UICMP() for size_t comparison, too) */
 666 typedef size_t          uiz_t;
 667 typedef ssize_t         siz_t;
 668
 669 #undef PRIuZ
 670 #undef PRIdZ
 671 #if defined __STDC_VERSION__ && __STDC_VERSION__ + 0 >= 199901L
 672 # define PRIuZ          "zu"
 673 # define PRIdZ          "zd"
 674 # define UIZ_MAX        SIZE_MAX
 675 #elif defined SIZE_MAX
 676   /* UnixWare has size_t as unsigned as required but uses a signed limit
 677    * constant (which is thus false!) */
 678 # if SIZE_MAX == UI64_MAX || SIZE_MAX == SI64_MAX
 679 #  define PRIuZ         PRIu64
 680 #  define PRIdZ         PRId64
 681 n_MCTA(sizeof(size_t) == sizeof(ui64_t),
 682    "Format string mismatch, compile with ISO C99 compiler (-std=c99)!")
 683 # elif SIZE_MAX == UI32_MAX || SIZE_MAX == SI32_MAX
 684 #  define PRIuZ         PRIu32
 685 #  define PRIdZ         PRId32
 686 n_MCTA(sizeof(size_t) == sizeof(ui32_t),
 687    "Format string mismatch, compile with ISO C99 compiler (-std=c99)!")
 688 # else
 689 #  error SIZE_MAX is neither UI64_MAX nor UI32_MAX (please report this)
 690 # endif
 691 # define UIZ_MAX        SIZE_MAX
 692 #endif
 693 #ifndef PRIuZ
 694 # define PRIuZ          "lu"
 695 # define PRIdZ          "ld"
 696 n_MCTA(sizeof(size_t) == sizeof(unsigned long),
 697    "Format string mismatch, compile with ISO C99 compiler (-std=c99)!")
 698 # define UIZ_MAX        ULONG_MAX
 699 #endif
 700
 701 #ifndef UINTPTR_MAX
 702 # ifdef SIZE_MAX
 703 #  define uintptr_t     size_t
 704 #  define UINTPTR_MAX   SIZE_MAX
 705 # else
 706 #  define uintptr_t     unsigned long
 707 #  define UINTPTR_MAX   ULONG_MAX
 708 # endif
 709 #endif
 710
 711 #if !defined PRIuPTR || !defined PRIXPTR
 712 # undef PRIuPTR
 713 # undef PRIXPTR
 714 # if UINTPTR_MAX == ULONG_MAX
 715 #  define PRIuPTR       "lu"
 716 #  define PRIXPTR       "lX"
 717 # else
 718 #  define PRIuPTR       "u"
 719 #  define PRIXPTR       "X"
 720 # endif
 721 #endif
 722
 723 enum {FAL0, TRU1, TRUM1 = -1};
 724 typedef si8_t           bool_t;
 725
 726 /* Add shorter aliases for "normal" integers */
 727 typedef unsigned long   ul_i;
 728 typedef unsigned int    ui_i;
 729 typedef unsigned short  us_i;
 730 typedef unsigned char   uc_i;
 731
 732 typedef signed long     sl_i;
 733 typedef signed int      si_i;
 734 typedef signed short    ss_i;
 735 typedef signed char     sc_i;
 736
 737 typedef void (          *sighandler_type)(int);
 738
 739 enum authtype {
 740    AUTHTYPE_NONE     = 1<<0,
 741    AUTHTYPE_PLAIN    = 1<<1,  /* POP3: APOP is covered by this */
 742    AUTHTYPE_LOGIN    = 1<<2,
 743    AUTHTYPE_CRAM_MD5 = 1<<3,
 744    AUTHTYPE_GSSAPI   = 1<<4
 745 };
 746
 747 enum expand_addr_flags {
 748    EAF_NONE       = 0,        /* -> EAF_NOFILE | EAF_NOPIPE */
 749    EAF_RESTRICT   = 1<<0,     /* "restrict" (do unless interaktive / -[~#]) */
 750    EAF_FAIL       = 1<<1,     /* "fail" */
 751    /* Bits reused by enum expand_addr_check_mode! */
 752    EAF_FILE       = 1<<3,     /* +"file" targets */
 753    EAF_PIPE       = 1<<4,     /* +"pipe" command pipe targets */
 754    EAF_NAME       = 1<<5,     /* +"name"s (non-address) names / MTA aliases */
 755    EAF_ADDR       = 1<<6,     /* +"addr" network address (contain "@") */
 756
 757    EAF_TARGET_MASK  = EAF_FILE | EAF_PIPE | EAF_NAME | EAF_ADDR,
 758    EAF_RESTRICT_TARGETS = EAF_NAME | EAF_ADDR /* (default set if not set) */
 759 };
 760
 761 enum expand_addr_check_mode {
 762    EACM_NONE      = 0,        /* Don't care about *expandaddr* */
 763    EACM_NORMAL    = 1<<0,     /* Use our normal *expandaddr* checking */
 764    EACM_STRICT    = 1<<1,     /* Never allow any file or pipe addresse */
 765    EACM_MODE_MASK = 0x3,      /* _NORMAL and _STRICT are mutual! */
 766
 767    EACM_NOLOG     = 1<<2,     /* Don't log check errors */
 768
 769    /* Some special overwrites of EAF_TARGETs.
 770     * May NOT clash with EAF_* bits which may be ORd to these here! */
 771
 772    EACM_NONAME    = 1<<16
 773 };
 774
 775 #ifdef HAVE_COLOUR
 776 /* We do have several groups of colour IDs; since only one of them can be
 777  * active at any given time let's share the value range */
 778 enum n_colour_group{
 779    n_COLOUR_GROUP_SUM,
 780    n_COLOUR_GROUP_VIEW,
 781    n__COLOUR_GROUPS = 2
 782 };
 783
 784 enum n_colour_id{
 785    /* Header summary */
 786    n_COLOUR_ID_SUM_DOTMARK = 0,
 787    n_COLOUR_ID_SUM_HEADER,
 788    n_COLOUR_ID_SUM_THREAD,
 789
 790    /* Message display */
 791    n_COLOUR_ID_VIEW_FROM_ = 0,
 792    n_COLOUR_ID_VIEW_HEADER,
 793    n_COLOUR_ID_VIEW_MSGINFO,
 794    n_COLOUR_ID_VIEW_PARTINFO,
 795
 796    n__COLOUR_IDS = n_COLOUR_ID_VIEW_PARTINFO + 1
 797 };
 798
 799 /* Colour preconditions, let's call them tags, cannot be an enum because for
 800  * message display they are the actual header name of the current header.  Thus
 801  * let's use constants of pseudo pointers */
 802 # define n_COLOUR_TAG_SUM_DOT ((char*)-2)
 803 # define n_COLOUR_TAG_SUM_OLDER ((char*)-3)
 804 #endif /* HAVE_COLOUR */
 805
 806 enum conversion {
 807    CONV_NONE,        /* no conversion */
 808    CONV_7BIT,        /* no conversion, is 7bit */
 809    CONV_FROMQP,      /* convert from quoted-printable */
 810    CONV_TOQP,        /* convert to quoted-printable */
 811    CONV_8BIT,        /* convert to 8bit (iconv) */
 812    CONV_FROMB64,     /* convert from base64 */
 813    CONV_FROMB64_T,   /* convert from base64/text */
 814    CONV_TOB64,       /* convert to base64 */
 815    CONV_FROMHDR,     /* convert from RFC1522 format */
 816    CONV_TOHDR,       /* convert to RFC1522 format */
 817    CONV_TOHDR_A      /* convert addresses for header */
 818 };
 819
 820 enum cproto {
 821    CPROTO_SMTP,
 822    CPROTO_POP3
 823 };
 824
 825 enum dotlock_state {
 826    DLS_NONE,
 827    DLS_CANT_CHDIR,            /* Failed to chdir(2) into desired path */
 828    DLS_NAMETOOLONG,           /* Lock file name would be too long */
 829    DLS_ROFS,                  /* Read-only filesystem (no error, mailbox RO) */
 830    DLS_NOPERM,                /* No permission to creat lock file */
 831    DLS_NOEXEC,                /* Privilege separated dotlocker not found */
 832    DLS_PRIVFAILED,            /* Rising privileges failed in dotlocker */
 833    DLS_EXIST,                 /* Lock file already exists, stale lock? */
 834    DLS_FISHY,                 /* Something makes us think bad of situation */
 835    DLS_DUNNO,                 /* Catch-all error */
 836    DLS_PING,                  /* Not an error, but have to wait for lock */
 837    DLS_ABANDON    = 1<<7      /* ORd to any but _NONE: give up, don't retry */
 838 };
 839
 840 enum exit_status {
 841    EXIT_OK        = EXIT_SUCCESS,
 842    EXIT_ERR       = EXIT_FAILURE,
 843    EXIT_USE       = 64,       /* sysexits.h:EX_USAGE */
 844    EXIT_NOUSER    = 67,       /* :EX_NOUSER */
 845    EXIT_COLL_ABORT = 1<<1,    /* Message collection was aborted */
 846    EXIT_SEND_ERROR = 1<<2     /* Unspecified send error occurred */
 847 };
 848
 849 enum fedit_mode {
 850    FEDIT_NONE     = 0,
 851    FEDIT_SYSBOX   = 1<<0,     /* %: prefix */
 852    FEDIT_RDONLY   = 1<<1,     /* Readonly (per-box, OPT_R_FLAG is global) */
 853    FEDIT_NEWMAIL  = 1<<2      /* `newmail' operation TODO OBSOLETE THIS! */
 854 };
 855
 856 enum fexp_mode {
 857    FEXP_FULL,                 /* Full expansion */
 858    FEXP_LOCAL     = 1<<0,     /* Result must be local file/maildir */
 859    FEXP_SHELL     = 1<<1,     /* No folder %,#,&,+ stuff, yet sh(1) */
 860    FEXP_NSHORTCUT = 1<<2,     /* Don't expand shortcuts */
 861    FEXP_SILENT    = 1<<3,     /* Don't print but only return errors */
 862    FEXP_MULTIOK   = 1<<4,     /* Expansion to many entries is ok */
 863    FEXP_NSHELL    = 1<<5      /* Don't do shell word exp. (but ~/, $VAR) */
 864 };
 865
 866 enum file_lock_type {
 867    FLT_READ,
 868    FLT_WRITE
 869 };
 870
 871 enum mimecontent {
 872    MIME_UNKNOWN,     /* unknown content */
 873    MIME_SUBHDR,      /* inside a multipart subheader */
 874    MIME_822,         /* message/rfc822 content */
 875    MIME_MESSAGE,     /* other message/ content */
 876    MIME_TEXT_PLAIN,  /* text/plain content */
 877    MIME_TEXT_HTML,   /* text/html content */
 878    MIME_TEXT,        /* other text/ content */
 879    MIME_ALTERNATIVE, /* multipart/alternative content */
 880    MIME_RELATED,     /* mime/related (RFC 2387) */
 881    MIME_DIGEST,      /* multipart/digest content */
 882    MIME_MULTI,       /* other multipart/ content */
 883    MIME_PKCS7,       /* PKCS7 content */
 884    MIME_DISCARD      /* content is discarded */
 885 };
 886
 887 enum mime_counter_evidence {
 888    MIMECE_NONE,
 889    MIMECE_SET        = 1<<0,  /* *mime-counter-evidence* was set */
 890    MIMECE_BIN_OVWR   = 1<<1,  /* appli../octet-stream: check, ovw if possible */
 891    MIMECE_ALL_OVWR   = 1<<2,  /* all: check, ovw if possible */
 892    MIMECE_BIN_PARSE  = 1<<3   /* appli../octet-stream: classify contents last */
 893 };
 894
 895 /* Content-Transfer-Encodings as defined in RFC 2045:
 896  * - Quoted-Printable, section 6.7
 897  * - Base64, section 6.8 */
 898 #define QP_LINESIZE     (4 * 19)       /* Max. compliant QP linesize */
 899
 900 #define B64_LINESIZE    (4 * 19)       /* Max. compliant Base64 linesize */
 901 #define B64_ENCODE_INPUT_PER_LINE 57   /* Max. input for Base64 encode/line */
 902
 903 enum mime_enc {
 904    MIMEE_NONE,       /* message is not in MIME format */
 905    MIMEE_BIN,        /* message is in binary encoding */
 906    MIMEE_8B,         /* message is in 8bit encoding */
 907    MIMEE_7B,         /* message is in 7bit encoding */
 908    MIMEE_QP,         /* message is quoted-printable */
 909    MIMEE_B64         /* message is in base64 encoding */
 910 };
 911
 912 /* xxx QP came later, maybe rewrite all to use mime_enc_flags directly? */
 913 enum mime_enc_flags {
 914    MIMEEF_NONE,
 915    MIMEEF_SALLOC     = 1<<0,  /* Use salloc(), not srealloc().. */
 916    /* ..result .s,.l point to user buffer of *_LINESIZE+[+[+]] bytes instead */
 917    MIMEEF_BUF        = 1<<1,
 918    MIMEEF_CRLF       = 1<<2,  /* (encode) Append "\r\n" to lines */
 919    MIMEEF_LF         = 1<<3,  /* (encode) Append "\n" to lines */
 920    /* (encode) If one of _CRLF/_LF is set, honour *_LINESIZE+[+[+]] and
 921     * inject the desired line-ending whenever a linewrap is desired */
 922    MIMEEF_MULTILINE  = 1<<4,
 923    /* (encode) Quote with header rules, do not generate soft NL breaks?
 924     * For mustquote(), specifies wether special RFC 2047 header rules
 925     * should be used instead */
 926    MIMEEF_ISHEAD     = 1<<5,
 927    /* (encode) Ditto; for mustquote() this furtherly fine-tunes behaviour in
 928     * that characters which would not be reported as "must-quote" when
 929     * detecting wether quoting is necessary at all will be reported as
 930     * "must-quote" if they have to be encoded in an encoded word */
 931    MIMEEF_ISENCWORD  = 1<<6,
 932    __MIMEEF_LAST     = 6
 933 };
 934
 935 enum qpflags {
 936    QP_NONE        = MIMEEF_NONE,
 937    QP_SALLOC      = MIMEEF_SALLOC,
 938    QP_BUF         = MIMEEF_BUF,
 939    QP_ISHEAD      = MIMEEF_ISHEAD,
 940    QP_ISENCWORD   = MIMEEF_ISENCWORD
 941 };
 942
 943 enum b64flags {
 944    B64_NONE       = MIMEEF_NONE,
 945    B64_SALLOC     = MIMEEF_SALLOC,
 946    B64_BUF        = MIMEEF_BUF,
 947    B64_CRLF       = MIMEEF_CRLF,
 948    B64_LF         = MIMEEF_LF,
 949    B64_MULTILINE  = MIMEEF_MULTILINE,
 950    /* Not used, but for clarity only */
 951    B64_ISHEAD     = MIMEEF_ISHEAD,
 952    B64_ISENCWORD  = MIMEEF_ISENCWORD,
 953    /* Special version of Base64, "Base64URL", according to RFC 4648.
 954     * Only supported for encoding! */
 955    B64_RFC4648URL = 1<<(__MIMEEF_LAST+1),
 956    /* Don't use any ("=") padding;
 957     * may NOT be used with any of _CRLF, _LF or _MULTILINE */
 958    B64_NOPAD      = 1<<(__MIMEEF_LAST+2)
 959 };
 960
 961 enum mime_parse_flags {
 962    MIME_PARSE_NONE      = 0,
 963    MIME_PARSE_DECRYPT   = 1<<0,
 964    MIME_PARSE_PARTS     = 1<<1
 965 };
 966
 967 enum mime_handler_flags {
 968    MIME_HDL_NULL,                /* No pipe- mimetype handler, go away */
 969    MIME_HDL_CMD,                 /* Normal command */
 970    MIME_HDL_TEXT,                /* @ special cmd to force treatment as text */
 971    MIME_HDL_PTF,                 /* A special pointer-to-function handler */
 972    MIME_HDL_MSG,                 /* Display msg (returned as command string) */
 973    MIME_HDL_TYPE_MASK   = 7,
 974    MIME_HDL_ISQUOTE     = 1<<4,  /* Is quote action (we have info, keep it!) */
 975    MIME_HDL_NOQUOTE     = 1<<5,  /* No MIME for quoting */
 976    MIME_HDL_ALWAYS      = 1<<6,  /* Handler shall run for multi-msg actions */
 977    MIME_HDL_ASYNC       = 1<<7,  /* Should run asynchronously */
 978    MIME_HDL_NEEDSTERM   = 1<<8,  /* Takes over terminal */
 979    MIME_HDL_TMPF        = 1<<9,  /* Create temporary file (zero-sized) */
 980    MIME_HDL_TMPF_FILL   = 1<<10, /* Fill in the msg body content */
 981    MIME_HDL_TMPF_UNLINK = 1<<11  /* Delete it later again */
 982 };
 983
 984 enum mlist_state {
 985    MLIST_OTHER       = 0,     /* Normal address */
 986    MLIST_KNOWN       = 1,     /* A known `mlist' */
 987    MLIST_SUBSCRIBED  = -1     /* A `mlsubscribe'd list */
 988 };
 989
 990 enum oflags {
 991    OF_RDONLY      = 1<<0,
 992    OF_WRONLY      = 1<<1,
 993    OF_RDWR        = 1<<2,
 994    OF_APPEND      = 1<<3,
 995    OF_CREATE      = 1<<4,
 996    OF_TRUNC       = 1<<5,
 997    OF_EXCL        = 1<<6,
 998    OF_CLOEXEC     = 1<<7,     /* TODO not used, always implied!  CHANGE!! */
 999    OF_UNLINK      = 1<<8,     /* Only for Ftmp(): unlink(2) after creation */
1000    OF_HOLDSIGS    = 1<<9,     /* Mutual with OF_UNLINK - await Ftmp_free() */
1001    OF_REGISTER    = 1<<10,    /* Register file in our file table */
1002    OF_REGISTER_UNLINK = 1<<11, /* unlink(2) upon unreg.; _REGISTER asserted! */
1003    OF_SUFFIX      = 1<<12     /* Ftmp() name hint is mandatory! extension! */
1004 };
1005
1006 enum okay {
1007    STOP = 0,
1008    OKAY = 1
1009 };
1010
1011 enum okey_xlook_mode {
1012    OXM_PLAIN      = 1<<0,     /* Plain key always tested */
1013    OXM_H_P        = 1<<1,     /* Check PLAIN-.url_h_p */
1014    OXM_U_H_P      = 1<<2,     /* Check PLAIN-.url_u_h_p */
1015    OXM_ALL        = 0x7
1016 };
1017
1018 /* <0 means "stop" unless *prompt* extensions are enabled. */
1019 enum prompt_exp {
1020    PROMPT_STOP    = -1,       /* \c */
1021    /* *prompt* extensions: \$, \@ etc. */
1022    PROMPT_DOLLAR  = -2,
1023    PROMPT_AT      = -3
1024 };
1025
1026 enum protocol {
1027    PROTO_FILE,       /* refers to a local file */
1028    PROTO_POP3,       /* is a pop3 server string */
1029    PROTO_MAILDIR,    /* refers to a maildir folder */
1030    PROTO_UNKNOWN     /* unknown protocol */
1031 };
1032
1033 enum sendaction {
1034    SEND_MBOX,        /* no conversion to perform */
1035    SEND_RFC822,      /* no conversion, no From_ line */
1036    SEND_TODISP,      /* convert to displayable form */
1037    SEND_TODISP_ALL,  /* same, include all MIME parts */
1038    SEND_SHOW,        /* convert to 'show' command form */
1039    SEND_TOSRCH,      /* convert for IMAP SEARCH */
1040    SEND_TOFILE,      /* convert for saving body to a file */
1041    SEND_TOPIPE,      /* convert for pipe-content/subc. */
1042    SEND_QUOTE,       /* convert for quoting */
1043    SEND_QUOTE_ALL,   /* same, include all MIME parts */
1044    SEND_DECRYPT      /* decrypt */
1045 };
1046
1047 #ifdef HAVE_SSL
1048 enum ssl_verify_level {
1049    SSL_VERIFY_IGNORE,
1050    SSL_VERIFY_WARN,
1051    SSL_VERIFY_ASK,
1052    SSL_VERIFY_STRICT
1053 };
1054 #endif
1055
1056 enum tdflags {
1057    TD_NONE,                   /* no display conversion */
1058    TD_ISPR        = 1<<0,     /* use isprint() checks */
1059    TD_ICONV       = 1<<1,     /* use iconv() */
1060    TD_DELCTRL     = 1<<2,     /* delete control characters */
1061
1062    /*
1063     * NOTE: _TD_EOF and _TD_BUFCOPY may be ORd with enum conversion and
1064     * enum sendaction, and may thus NOT clash with their bit range!
1065     */
1066    _TD_EOF        = 1<<14,    /* EOF seen, last round! */
1067    _TD_BUFCOPY    = 1<<15     /* Buffer may be constant, copy it */
1068 };
1069
1070 enum user_options {
1071    OPT_NONE,
1072    OPT_DEBUG      = 1u<< 0,   /* -d / *debug* */
1073    OPT_VERB       = 1u<< 1,   /* -v / *verbose* */
1074    OPT_VERBVERB   = 1u<< 2,   /* .. even more verbosity */
1075    OPT_EXISTONLY  = 1u<< 3,   /* -e */
1076    OPT_HEADERSONLY = 1u<<4,   /* -H */
1077    OPT_HEADERLIST = 1u<< 5,   /* -L */
1078    OPT_QUICKRUN_MASK = OPT_EXISTONLY | OPT_HEADERSONLY | OPT_HEADERLIST,
1079    OPT_E_FLAG     = 1u<< 7,   /* -E / *skipemptybody* */
1080    OPT_F_FLAG     = 1u<< 8,   /* -F */
1081    OPT_N_FLAG     = 1u<< 9,   /* -N / *header* */
1082    OPT_R_FLAG     = 1u<<10,   /* -R */
1083    OPT_r_FLAG     = 1u<<11,   /* -r (plus option_r_arg) */
1084    OPT_t_FLAG     = 1u<<12,   /* -t */
1085    OPT_u_FLAG     = 1u<<13,   /* -u / $USER and pw->pw_uid != getuid(2) */
1086    OPT_TILDE_FLAG = 1u<<14,   /* -~ */
1087    OPT_BATCH_FLAG = 1u<<15,   /* -# */
1088
1089    /*  */
1090    OPT_MEMDEBUG   = 1<<16,    /* *memdebug* */
1091
1092    /*  */
1093    OPT_SENDMODE   = 1u<<17,   /* Usage case forces send mode */
1094    OPT_TTYIN      = 1u<<18,
1095    OPT_TTYOUT     = 1u<<19,
1096    OPT_INTERACTIVE = 1u<<20,
1097    OPT_UNICODE    = 1u<<21,   /* We're in an UTF-8 environment */
1098    OPT_ENC_MBSTATE = 1u<<22,  /* Multibyte environment with shift states */
1099
1100    /* Some easy-access shortcuts */
1101    OPT_D_V        = OPT_DEBUG | OPT_VERB,
1102    OPT_D_VV       = OPT_DEBUG | OPT_VERBVERB,
1103    OPT_D_V_VV     = OPT_DEBUG | OPT_VERB | OPT_VERBVERB
1104 };
1105
1106 #define OBSOLETE(X) \
1107 do {\
1108    if (options & OPT_D_V_VV)\
1109       n_err("%s: %s\n", _("Obsoletion warning"), X);\
1110 } while (0)
1111 #define OBSOLETE2(X,Y) \
1112 do {\
1113    if (options & OPT_D_V_VV)\
1114       n_err("%s: %s: %s\n", _("Obsoletion warning"), X, Y);\
1115 } while (0)
1116
1117 enum program_state {
1118    PS_NONE           = 0,
1119    PS_STARTED        = 1<< 0,       /* main.c startup code passed, functional */
1120
1121    PS_LOADING        = 1<< 1,       /* Loading user resource files, startup */
1122    PS_SOURCING       = 1<< 2,       /* Sourcing a resource file */
1123    PS_IN_LOAD        = PS_LOADING | PS_SOURCING,
1124    PS_PIPING         = 1<< 3,       /* `source'ing via pipe */
1125
1126    PS_EVAL_ERROR     = 1<< 4,       /* Last evaluate() command failed */
1127
1128    PS_HOOK_NEWMAIL   = 1<< 6,
1129    PS_HOOK           = 1<< 7,
1130    PS_HOOK_MASK      = PS_HOOK_NEWMAIL | PS_HOOK,
1131
1132    PS_EDIT           = 1<< 8,       /* Current mailbox not a "system mailbox" */
1133    PS_SETFILE_OPENED = 1<< 9,       /* (hack) setfile() opened a new box */
1134    PS_SAW_COMMAND    = 1<<10,       /* ..after mailbox switch */
1135
1136    PS_DID_PRINT_DOT  = 1<<16,       /* Current message has been printed */
1137
1138    PS_MSGLIST_SAW_NO = 1<<17,       /* Last *LIST saw numerics */
1139    PS_MSGLIST_DIRECT = 1<<18,       /* One msg was directly chosen by number */
1140    PS_MSGLIST_MASK   = PS_MSGLIST_SAW_NO | PS_MSGLIST_DIRECT,
1141
1142    PS_HEADER_NEEDED_MIME = 1<<20,   /* mime_write_tohdr() needed x TODO HACK! */
1143
1144    PS_COLOUR_ACTIVE  = 1<<22,       /* n_colour_env_create().._gut() cycle */
1145
1146    /* Various first-time-init switches */
1147    PS_ERRORS_NOTED   = 1<<24,       /* Ring of `errors' content, print msg */
1148    PS_ATTACHMENTS_NOTED = 1<<25,    /* Attachment filename quoting noted */
1149    PS_t_FLAG         = 1<<26        /* OPT_t_FLAG made persistant */
1150 };
1151
1152 /* A large enum with all the boolean and value options a.k.a their keys.
1153  * Only the constant keys are in here, to be looked up via ok_[bv]look(),
1154  * ok_[bv]set() and ok_[bv]clear().
1155  * Note: see the comments in accmacvar.c before changing *anything* in here! */
1156 enum okeys {
1157    /* TODO likely temporary hook data, v15 drop */
1158    ok_v_on_compose_enter,
1159    ok_v_on_compose_leave,
1160    ok_v_compose_from,
1161    ok_v_compose_sender,
1162    ok_v_compose_to,
1163    ok_v_compose_cc,
1164    ok_v_compose_bcc,
1165    ok_v_compose_subject,
1166
1167    ok_b_add_file_recipients,
1168    ok_v_agent_shell_lookup,
1169    ok_b_allnet,
1170    ok_b_append,
1171    ok_b_ask,
1172    ok_b_askatend,
1173    ok_b_askattach,
1174    ok_b_askbcc,
1175    ok_b_askcc,
1176    ok_b_asksign,
1177    ok_b_asksub,
1178    ok_b_attachment_ask_content_description,
1179    ok_b_attachment_ask_content_disposition,
1180    ok_b_attachment_ask_content_id,
1181    ok_b_attachment_ask_content_type,
1182    ok_v_attrlist,
1183    ok_v_autobcc,
1184    ok_v_autocc,
1185    ok_b_autocollapse,
1186    ok_b_autoprint,
1187 ok_b_autothread,
1188    ok_v_autosort,
1189
1190    ok_b_bang,
1191    ok_b_batch_exit_on_error,
1192    ok_b_bsdannounce,
1193    ok_b_bsdcompat,
1194    ok_b_bsdflags,
1195    ok_b_bsdheadline,
1196    ok_b_bsdmsgs,
1197    ok_b_bsdorder,
1198    ok_b_bsdset,
1199
1200    ok_v_charset_7bit,
1201    ok_v_charset_8bit,
1202    ok_v_charset_unknown_8bit,
1203    ok_v_cmd,
1204    ok_b_colour_disable,
1205    ok_b_colour_pager,
1206    ok_v_colour_terms,
1207    ok_v_crt,
1208    ok_v_customhdr,
1209
1210    ok_v_DEAD,
1211    ok_v_datefield,
1212    ok_v_datefield_markout_older,
1213    ok_b_debug,                         /* {special=1} */
1214    ok_b_disposition_notification_send,
1215    ok_b_dot,
1216    ok_b_dotlock_ignore_error,
1217
1218    ok_v_EDITOR,
1219    ok_b_editalong,
1220    ok_b_editheaders,
1221 ok_b_emptybox,
1222    ok_b_emptystart,
1223    ok_v_encoding,
1224    ok_v_escape,
1225    ok_v_expandaddr,
1226    ok_v_expandargv,
1227
1228    ok_v_features,                      /* {rdonly=1,virtual=_features} */
1229    ok_b_flipr,
1230    ok_v_folder,                        /* {special=1} */
1231    ok_v_folder_hook,
1232    ok_b_followup_to,
1233    ok_v_followup_to_honour,
1234    ok_b_forward_as_attachment,
1235    ok_v_from,
1236    ok_b_fullnames,
1237    ok_v_fwdheading,
1238
1239    ok_b_header,                        /* {special=1} */
1240    ok_v_headline,
1241    ok_v_headline_bidi,
1242    ok_v_history_file,
1243    ok_b_history_gabby,
1244    ok_b_history_gabby_persist,
1245    ok_v_history_size,
1246    ok_b_hold,
1247    ok_v_hostname,
1248
1249    ok_b_idna_disable,
1250    ok_b_ignore,
1251    ok_b_ignoreeof,
1252    ok_v_indentprefix,
1253
1254    ok_b_keep,
1255    ok_b_keep_content_length,
1256    ok_b_keepsave,
1257
1258    ok_v_LISTER,
1259    ok_v_line_editor_cursor_right,      /* {special=1} */
1260    ok_b_line_editor_disable,
1261
1262    ok_v_MAIL,
1263    ok_v_MBOX,
1264    ok_b_markanswered,
1265    ok_b_mbox_rfc4155,
1266    ok_b_memdebug,                      /* {special=1} */
1267    ok_b_message_id_disable,
1268    ok_v_message_inject_head,
1269    ok_v_message_inject_tail,
1270    ok_b_metoo,
1271    ok_b_mime_allow_text_controls,
1272    ok_b_mime_alternative_favour_rich,
1273    ok_v_mime_counter_evidence,
1274    ok_v_mimetypes_load_control,
1275
1276    ok_v_NAIL_EXTRA_RC,                 /* {name=NAIL_EXTRA_RC} */
1277 ok_v_NAIL_HEAD,                     /* {name=NAIL_HEAD} */
1278 ok_v_NAIL_HISTFILE,                 /* {name=NAIL_HISTFILE} */
1279 ok_v_NAIL_HISTSIZE,                 /* {name=NAIL_HISTSIZE} */
1280 ok_v_NAIL_TAIL,                     /* {name=NAIL_TAIL} */
1281    ok_b_netrc_lookup,
1282    ok_v_newfolders,
1283    ok_v_newmail,
1284
1285    ok_b_outfolder,
1286
1287    ok_v_PAGER,
1288    ok_b_page,
1289    ok_v_password,
1290    ok_b_piperaw,
1291    ok_v_pop3_auth,
1292    ok_b_pop3_bulk_load,
1293    ok_v_pop3_keepalive,
1294    ok_b_pop3_no_apop,
1295    ok_b_pop3_use_starttls,
1296    ok_b_print_alternatives,
1297    ok_v_prompt,
1298
1299    ok_b_quiet,
1300    ok_v_quote,
1301    ok_b_quote_as_attachment,
1302    ok_v_quote_fold,
1303
1304    ok_b_recipients_in_cc,
1305    ok_v_record,
1306    ok_b_record_resent,
1307    ok_b_reply_in_same_charset,
1308    ok_v_reply_strings,
1309    ok_v_replyto,
1310    ok_v_reply_to_honour,
1311    ok_b_rfc822_body_from_,             /* {name=rfc822-body-from_} */
1312
1313    ok_v_SHELL,
1314    ok_b_save,
1315    ok_v_screen,
1316    ok_b_searchheaders,
1317    ok_v_sendcharsets,
1318    ok_b_sendcharsets_else_ttycharset,
1319    ok_v_sender,
1320    ok_v_sendmail,
1321    ok_v_sendmail_arguments,
1322    ok_b_sendmail_no_default_arguments,
1323    ok_v_sendmail_progname,
1324    ok_b_sendwait,
1325    ok_b_showlast,
1326    ok_b_showname,
1327    ok_b_showto,
1328    ok_v_Sign,
1329    ok_v_sign,
1330    ok_v_signature,
1331    ok_b_skipemptybody,                 /* {special=1} */
1332    ok_v_smime_ca_dir,
1333    ok_v_smime_ca_file,
1334    ok_v_smime_cipher,
1335    ok_v_smime_crl_dir,
1336    ok_v_smime_crl_file,
1337    /* smime-encrypt-USER@HOST */
1338    ok_b_smime_force_encryption,
1339    ok_b_smime_no_default_ca,
1340    ok_b_smime_sign,
1341    ok_v_smime_sign_cert,
1342    ok_v_smime_sign_include_certs,
1343    ok_v_smime_sign_message_digest,
1344    ok_v_smtp,
1345    ok_v_smtp_auth,
1346 ok_v_smtp_auth_password,
1347 ok_v_smtp_auth_user,
1348    ok_v_smtp_hostname,
1349    ok_b_smtp_use_starttls,
1350    ok_v_spam_interface,
1351    ok_v_spam_maxsize,
1352    ok_v_spamc_command,
1353    ok_v_spamc_arguments,
1354    ok_v_spamc_user,
1355    ok_v_spamd_socket,
1356    ok_v_spamd_user,
1357    ok_v_spamfilter_ham,
1358    ok_v_spamfilter_noham,
1359    ok_v_spamfilter_nospam,
1360    ok_v_spamfilter_rate,
1361    ok_v_spamfilter_rate_scanscore,
1362    ok_v_spamfilter_spam,
1363    ok_v_ssl_ca_dir,
1364    ok_v_ssl_ca_file,
1365    ok_v_ssl_cert,
1366    ok_v_ssl_cipher_list,
1367    ok_v_ssl_config_file,
1368    ok_v_ssl_crl_dir,
1369    ok_v_ssl_crl_file,
1370    ok_v_ssl_key,
1371    ok_v_ssl_method,
1372    ok_b_ssl_no_default_ca,
1373    ok_v_ssl_protocol,
1374    ok_v_ssl_rand_egd,
1375    ok_v_ssl_rand_file,
1376    ok_v_ssl_verify,
1377    ok_v_stealthmua,
1378
1379    ok_b_term_ca_mode,
1380    ok_v_toplines,
1381    ok_v_ttycharset,
1382
1383    ok_v_user,
1384
1385    ok_v_VISUAL,
1386    ok_b_v15_compat,
1387    ok_b_verbose,                       /* {special=1} */
1388    ok_v_version,                       /* {rdonly=1,virtual=VERSION} */
1389    ok_v_version_major,                 /* {rdonly=1,virtual=VERSION_MAJOR} */
1390    ok_v_version_minor,                 /* {rdonly=1,virtual=VERSION_MINOR} */
1391    ok_v_version_update,                /* {rdonly=1,virtual=VERSION_UPDATE} */
1392
1393    ok_b_writebackedited
1394 };
1395
1396 /* Locale-independent character classes */
1397 enum {
1398    C_CNTRL        = 0000,
1399    C_BLANK        = 0001,
1400    C_WHITE        = 0002,
1401    C_SPACE        = 0004,
1402    C_PUNCT        = 0010,
1403    C_OCTAL        = 0020,
1404    C_DIGIT        = 0040,
1405    C_UPPER        = 0100,
1406    C_LOWER        = 0200
1407 };
1408
1409 struct str {
1410    char     *s;      /* the string's content */
1411    size_t   l;       /* the stings's length */
1412 };
1413
1414 struct bidi_info {
1415    struct str  bi_start;      /* Start of (possibly) bidirectional text */
1416    struct str  bi_end;        /* End of ... */
1417    size_t      bi_pad;        /* No of visual columns to reserve for BIDI pad */
1418 };
1419
1420 #ifdef HAVE_COLOUR
1421 struct n_colour_pen;
1422 #endif
1423
1424 struct url {
1425    char const     *url_input;       /* Input as given (really) */
1426    enum cproto    url_cproto;       /* Communication protocol as given */
1427    bool_t         url_needs_tls;    /* Wether the protocol uses SSL/TLS */
1428    bool_t         url_had_user;     /* Wether .url_user was part of the URL */
1429    ui16_t         url_portno;       /* atoi .url_port or default, host endian */
1430    char const     *url_port;        /* Port (if given) or NULL */
1431    char           url_proto[14];    /* Communication protocol as 'xy\0//' */
1432    ui8_t          url_proto_len;    /* Length of .url_proto ('\0' index) */
1433    ui8_t          url_proto_xlen;   /* .. if '\0' is replaced with ':' */
1434    struct str     url_user;         /* User, exactly as given / looked up */
1435    struct str     url_user_enc;     /* User, urlxenc()oded */
1436    struct str     url_pass;         /* Pass (urlxdec()oded) or NULL */
1437    struct str     url_host;         /* Service hostname */
1438    struct str     url_path;         /* Path suffix or NULL */
1439    /* TODO: url_get_component(url *, enum COMPONENT, str *store) */
1440    struct str     url_h_p;          /* .url_host[:.url_port] */
1441    /* .url_user@.url_host
1442     * Note: for CPROTO_SMTP this may resolve HOST via *smtp-hostname* (->
1443     * *hostname*)!  (And may later be overwritten according to *from*!) */
1444    struct str     url_u_h;
1445    struct str     url_u_h_p;        /* .url_user@.url_host[:.url_port] */
1446    struct str     url_eu_h_p;       /* .url_user_enc@.url_host[:.url_port] */
1447    char const     *url_p_u_h_p;     /* .url_proto://.url_u_h_p */
1448    char const     *url_p_eu_h_p;    /* .url_proto://.url_eu_h_p */
1449    char const     *url_p_eu_h_p_p;  /* .url_proto://.url_eu_h_p[/.url_path] */
1450 };
1451
1452 struct ccred {
1453    enum cproto    cc_cproto;     /* Communication protocol */
1454    enum authtype  cc_authtype;   /* Desired authentication */
1455    char const     *cc_auth;      /* Authentication type as string */
1456    struct str     cc_user;       /* User (urlxdec()oded) or NULL */
1457    struct str     cc_pass;       /* Password (urlxdec()oded) or NULL */
1458 };
1459
1460 #ifdef HAVE_DOTLOCK
1461 struct dotlock_info {
1462    char const  *di_file_name;    /* Mailbox to lock */
1463    char const  *di_lock_name;    /* .di_file_name + .lock */
1464    char const  *di_hostname;     /* ..filled in parent (due resolver delays) */
1465    char const  *di_randstr;      /* ..ditto, random string */
1466    size_t      di_pollmsecs;     /* Delay in between locking attempts */
1467    struct stat *di_stb;
1468 };
1469 #endif
1470
1471 struct mime_handler {
1472    enum mime_handler_flags mh_flags;
1473    struct str  mh_msg;           /* Message describing this command */
1474    /* XXX union{} the following? */
1475    char const  *mh_shell_cmd;    /* For MIME_HDL_CMD */
1476    int         (*mh_ptf)(void);  /* PTF main() for MIME_HDL_PTF */
1477 };
1478
1479 struct time_current {
1480    time_t      tc_time;
1481    struct tm   tc_gm;
1482    struct tm   tc_local;
1483    char        tc_ctime[32];
1484 };
1485
1486 struct quoteflt {
1487    FILE        *qf_os;        /* Output stream */
1488    char const  *qf_pfix;
1489    ui32_t      qf_pfix_len;   /* Length of prefix: 0: bypass */
1490    ui32_t      qf_qfold_min;  /* Simple way: wrote prefix? */
1491 #ifdef HAVE_QUOTE_FOLD
1492    ui32_t      qf_qfold_max;  /* Otherwise: line lengths */
1493    ui8_t       qf_state;      /* *quote-fold* state machine */
1494    bool_t      qf_brk_isws;   /* Breakpoint is at WS */
1495    ui8_t       __dummy[2];
1496    ui32_t      qf_wscnt;      /* Whitespace count */
1497    ui32_t      qf_brkl;       /* Breakpoint */
1498    ui32_t      qf_brkw;       /* Visual width, breakpoint */
1499    ui32_t      qf_datw;       /* Current visual output line width */
1500    struct str  qf_dat;        /* Current visual output line */
1501    struct str  qf_currq;      /* Current quote, compressed */
1502    mbstate_t   qf_mbps[2];
1503 #endif
1504 };
1505
1506 #ifdef HAVE_FILTER_HTML_TAGSOUP
1507 struct htmlflt {
1508    FILE        *hf_os;        /* Output stream */
1509    ui32_t      hf_flags;
1510    ui32_t      hf_lmax;       /* Maximum byte +1 in .hf_line/4 */
1511    ui32_t      hf_len;        /* Current bytes in .hf_line */
1512    ui32_t      hf_last_ws;    /* Last whitespace on line (fold purposes) */
1513    ui32_t      hf_mboff;      /* Last offset for "mbtowc" */
1514    ui32_t      hf_mbwidth;    /* We count characters not bytes if possible */
1515    char        *hf_line;      /* Output line buffer - MUST be last field! */
1516    si32_t      hf_href_dist;  /* Count of lines since last HREF flush */
1517    ui32_t      hf_href_no;    /* HREF sequence number */
1518    struct htmlflt_href *hf_hrefs;
1519    struct htmlflt_tag const *hf_ign_tag; /* Tag that will end ignore mode */
1520    char        *hf_curr;      /* Current cursor into .hf_bdat */
1521    char        *hf_bmax;      /* Maximum byte in .hf_bdat +1 */
1522    char        *hf_bdat;      /* (Temporary) Tag content data storage */
1523 };
1524 #endif
1525
1526 struct search_expr {
1527    char const  *ss_where;     /* ..to search for the expr. (not always used) */
1528    char const  *ss_sexpr;     /* String search expr.; NULL: use .ss_regex */
1529 #ifdef HAVE_REGEX
1530    regex_t     ss_regex;
1531 #endif
1532 };
1533
1534 struct eval_ctx {
1535    struct str  ev_line;          /* The terminated data to evaluate */
1536    ui32_t      ev_line_size;     /* May be used to store line memory size */
1537    bool_t      ev_is_recursive;  /* Evaluation in evaluation? (collect ~:) */
1538    ui8_t       __dummy[3];
1539    bool_t      ev_add_history;   /* Enter (final) command in history? */
1540    char const  *ev_new_content;  /* History: reenter line, start with this */
1541 };
1542
1543 struct termios_state {
1544    struct termios ts_tios;
1545    char        *ts_linebuf;
1546    size_t      ts_linesize;
1547    bool_t      ts_needs_reset;
1548 };
1549
1550 #define termios_state_reset() \
1551 do {\
1552    if (termios_state.ts_needs_reset) {\
1553       tcsetattr(0, TCSADRAIN, &termios_state.ts_tios);\
1554       termios_state.ts_needs_reset = FAL0;\
1555    }\
1556 } while (0)
1557
1558 struct sock {                 /* data associated with a socket */
1559    int         s_fd;          /* file descriptor */
1560 #ifdef HAVE_SSL
1561    int         s_use_ssl;     /* SSL is used */
1562 # ifdef HAVE_OPENSSL
1563    void        *s_ssl;        /* SSL object */
1564 # endif
1565 #endif
1566    char        *s_wbuf;       /* for buffered writes */
1567    int         s_wbufsize;    /* allocated size of s_buf */
1568    int         s_wbufpos;     /* position of first empty data byte */
1569    char        *s_rbufptr;    /* read pointer to s_rbuf */
1570    int         s_rsz;         /* size of last read in s_rbuf */
1571    char const  *s_desc;       /* description of error messages */
1572    void        (*s_onclose)(void);     /* execute on close */
1573    char        s_rbuf[LINESIZE + 1];   /* for buffered reads */
1574 };
1575
1576 struct sockconn {
1577    struct url     sc_url;
1578    struct ccred   sc_cred;
1579    struct sock    sc_sock;
1580 };
1581
1582 struct mailbox {
1583    enum {
1584       MB_NONE     = 000,      /* no reply expected */
1585       MB_COMD     = 001,      /* command reply expected */
1586       MB_MULT     = 002,      /* multiline reply expected */
1587       MB_PREAUTH  = 004,      /* not in authenticated state */
1588       MB_BYE      = 010       /* may accept a BYE state */
1589    }           mb_active;
1590    FILE        *mb_itf;       /* temp file with messages, read open */
1591    FILE        *mb_otf;       /* same, write open */
1592    char        *mb_sorted;    /* sort method */
1593    enum {
1594       MB_VOID,       /* no type (e. g. connection failed) */
1595       MB_FILE,       /* local file */
1596       MB_POP3,       /* POP3 mailbox */
1597       MB_MAILDIR     /* maildir folder */
1598    }           mb_type;       /* type of mailbox */
1599    enum {
1600       MB_DELE = 01,  /* may delete messages in mailbox */
1601       MB_EDIT = 02   /* may edit messages in mailbox */
1602    }           mb_perm;
1603    int mb_threaded;           /* mailbox has been threaded */
1604    struct sock mb_sock;       /* socket structure */
1605 };
1606
1607 enum needspec {
1608    NEED_UNSPEC,      /* unspecified need, don't fetch */
1609    NEED_HEADER,      /* need the header of a message */
1610    NEED_BODY         /* need header and body of a message */
1611 };
1612
1613 enum havespec {
1614    HAVE_NOTHING,              /* nothing downloaded yet */
1615    HAVE_HEADER    = 01,       /* header is downloaded */
1616    HAVE_BODY      = 02        /* entire message is downloaded */
1617 };
1618
1619 /* flag bits. Attention: Flags that are used in cache.c may not change */
1620 enum mflag {
1621    MUSED          = (1<< 0),  /* entry is used, but this bit isn't */
1622    MDELETED       = (1<< 1),  /* entry has been deleted */
1623    MSAVED         = (1<< 2),  /* entry has been saved */
1624    MTOUCH         = (1<< 3),  /* entry has been noticed */
1625    MPRESERVE      = (1<< 4),  /* keep entry in sys mailbox */
1626    MMARK          = (1<< 5),  /* message is marked! */
1627    MODIFY         = (1<< 6),  /* message has been modified */
1628    MNEW           = (1<< 7),  /* message has never been seen */
1629    MREAD          = (1<< 8),  /* message has been read sometime. */
1630    MSTATUS        = (1<< 9),  /* message status has changed */
1631    MBOX           = (1<<10),  /* Send this to mbox, regardless */
1632    MNOFROM        = (1<<11),  /* no From line */
1633    MHIDDEN        = (1<<12),  /* message is hidden to user */
1634    MBOXED         = (1<<13),  /* message has been sent to mbox */
1635    MNEWEST        = (1<<14),  /* message is very new (newmail) */
1636    MFLAG          = (1<<15),  /* message has been flagged recently */
1637    MUNFLAG        = (1<<16),  /* message has been unflagged */
1638    MFLAGGED       = (1<<17),  /* message is `flagged' */
1639    MANSWER        = (1<<18),  /* message has been answered recently */
1640    MUNANSWER      = (1<<19),  /* message has been unanswered */
1641    MANSWERED      = (1<<20),  /* message is `answered' */
1642    MDRAFT         = (1<<21),  /* message has been drafted recently */
1643    MUNDRAFT       = (1<<22),  /* message has been undrafted */
1644    MDRAFTED       = (1<<23),  /* message is marked as `draft' */
1645    MOLDMARK       = (1<<24),  /* messages was marked previously */
1646    MSPAM          = (1<<25),  /* message is classified as spam */
1647    MSPAMUNSURE    = (1<<26)   /* message may be spam, but it is unsure */
1648 };
1649 #define MMNORM          (MDELETED | MSAVED | MHIDDEN)
1650 #define MMNDEL          (MDELETED | MHIDDEN)
1651
1652 #define visible(mp)     (((mp)->m_flag & MMNDEL) == 0)
1653
1654 struct mimepart {
1655    enum mflag  m_flag;        /* flags */
1656    enum havespec m_have;      /* downloaded parts of the part */
1657 #ifdef HAVE_SPAM
1658    ui32_t      m_spamscore;   /* Spam score as int, 24:8 bits */
1659 #endif
1660    int         m_block;       /* block number of this part */
1661    size_t      m_offset;      /* offset in block of part */
1662    size_t      m_size;        /* Bytes in the part */
1663    size_t      m_xsize;       /* Bytes in the full part */
1664    long        m_lines;       /* Lines in the message */
1665    long        m_xlines;      /* Lines in the full message */
1666    time_t      m_time;        /* time the message was sent */
1667    char const  *m_from;       /* message sender */
1668    struct mimepart *m_nextpart;     /* next part at same level */
1669    struct mimepart *m_multipart;    /* parts of multipart */
1670    struct mimepart *m_parent;       /* enclosing multipart part */
1671    char const  *m_ct_type;          /* content-type */
1672    char const  *m_ct_type_plain;    /* content-type without specs */
1673    char const  *m_ct_type_usr_ovwr; /* Forcefully overwritten one */
1674    enum mimecontent m_mimecontent;  /* same in enum */
1675    char const  *m_charset;    /* charset */
1676    char const  *m_ct_enc;     /* content-transfer-encoding */
1677    enum mime_enc m_mime_enc;     /* same in enum */
1678    char        *m_partstring; /* part level string */
1679    char        *m_filename;   /* attachment filename */
1680 };
1681
1682 struct message {
1683    enum mflag  m_flag;        /* flags */
1684    enum havespec m_have;      /* downloaded parts of the message */
1685 #ifdef HAVE_SPAM
1686    ui32_t      m_spamscore;   /* Spam score as int, 24:8 bits */
1687 #endif
1688    int         m_block;       /* block number of this message */
1689    size_t      m_offset;      /* offset in block of message */
1690    size_t      m_size;        /* Bytes in the message */
1691    size_t      m_xsize;       /* Bytes in the full message */
1692    long        m_lines;       /* Lines in the message */
1693    long        m_xlines;      /* Lines in the full message */
1694    time_t      m_time;        /* time the message was sent */
1695    time_t      m_date;        /* time in the 'Date' field */
1696    unsigned    m_idhash;      /* hash on Message-ID for threads */
1697    struct message *m_child;   /* first child of this message */
1698    struct message *m_younger; /* younger brother of this message */
1699    struct message *m_elder;   /* elder brother of this message */
1700    struct message *m_parent;  /* parent of this message */
1701    unsigned    m_level;       /* thread level of message */
1702    long        m_threadpos;   /* position in threaded display */
1703    char        *m_maildir_file;  /* original maildir file of msg */
1704    ui32_t      m_maildir_hash;   /* hash of file name in maildir sub */
1705    int         m_collapsed;      /* collapsed thread information */
1706 };
1707
1708 /* Given a file address, determine the block number it represents */
1709 #define mailx_blockof(off)                ((int) ((off) / 4096))
1710 #define mailx_offsetof(off)               ((int) ((off) % 4096))
1711 #define mailx_positionof(block, offset)   ((off_t)(block) * 4096 + (offset))
1712
1713 /* Argument types */
1714 enum argtype {
1715    ARG_MSGLIST    = 0,        /* Message list type */
1716    ARG_STRLIST    = 1,        /* A pure string */
1717    ARG_RAWLIST    = 2,        /* Shell string list */
1718    ARG_NOLIST     = 3,        /* Just plain 0 */
1719    ARG_NDMLIST    = 4,        /* Message list, no defaults */
1720    ARG_ECHOLIST   = 5,        /* Like raw list, but keep quote chars */
1721    ARG_ARGMASK    = 7,        /* Mask of the above */
1722
1723    ARG_A          = 1u<< 4,   /* Needs an active mailbox */
1724    ARG_F          = 1u<< 5,   /* Is a conditional command */
1725    ARG_H          = 1u<< 6,   /* Never place in history */
1726    ARG_I          = 1u<< 7,   /* Interactive command bit */
1727    ARG_M          = 1u<< 8,   /* Legal from send mode bit */
1728    ARG_P          = 1u<< 9,   /* Autoprint dot after command */
1729    ARG_R          = 1u<<10,   /* Cannot be called from collect / recursion */
1730    ARG_T          = 1u<<11,   /* Is a transparent command */
1731    ARG_V          = 1u<<12,   /* Places data in temporary_arg_v_store */
1732    ARG_W          = 1u<<13,   /* Invalid when read only bit */
1733    ARG_O          = 1u<<14    /* OBSOLETE()d command */
1734 };
1735
1736 enum gfield {
1737    GTO            = 1<< 0,    /* Grab To: line */
1738    GSUBJECT       = 1<< 1,    /* Likewise, Subject: line */
1739    GCC            = 1<< 2,    /* And the Cc: line */
1740    GBCC           = 1<< 3,    /* And also the Bcc: line */
1741
1742    GNL            = 1<< 4,    /* Print blank line after */
1743    GDEL           = 1<< 5,    /* Entity removed from list */
1744    GCOMMA         = 1<< 6,    /* detract() puts in commas */
1745    GUA            = 1<< 7,    /* User-Agent field */
1746    GMIME          = 1<< 8,    /* MIME 1.0 fields */
1747    GMSGID         = 1<< 9,    /* a Message-ID */
1748    GNAMEONLY      = 1<<10,    /* detract() does NOT use fullnames */
1749
1750    GIDENT         = 1<<11,    /* From:, Reply-To:, MFT: (user headers) */
1751    GREF           = 1<<12,    /* References:, In-Reply-To:, (Message-ID:) */
1752    GDATE          = 1<<13,    /* Date: field */
1753    GFULL          = 1<<14,    /* Include full names, comments etc. */
1754    GSKIN          = 1<<15,    /* Skin names */
1755    GEXTRA         = 1<<16,    /* Extra fields (mostly like GIDENT XXX) */
1756    GFILES         = 1<<17,    /* Include filename and pipe addresses */
1757    GFULLEXTRA     = 1<<18     /* Only with GFULL: GFULL less address */
1758 };
1759 #define GMASK           (GTO | GSUBJECT | GCC | GBCC)
1760
1761 enum header_flags {
1762    HF_NONE        = 0,
1763    HF_LIST_REPLY  = 1<< 0,
1764    HF_MFT_SENDER  = 1<< 1,    /* Add ourselves to Mail-Followup-To: */
1765    HF_RECIPIENT_RECORD = 1<<10, /* Save message in file named after rec. */
1766    HF__NEXT_SHIFT = 11
1767 };
1768
1769 /* Structure used to pass about the current state of a message (header) */
1770 struct n_header_field{
1771    struct n_header_field *hf_next;
1772    ui32_t hf_nl;              /* Field-name length */
1773    ui32_t hf_bl;              /* Field-body length*/
1774    char hf_dat[VFIELD_SIZE(0)];
1775 };
1776
1777 struct header {
1778    ui32_t      h_flags;       /* enum header_flags bits */
1779    ui32_t      h_dummy;
1780    struct name *h_to;         /* Dynamic "To:" string */
1781    char        *h_subject;    /* Subject string */
1782    struct name *h_cc;         /* Carbon copies string */
1783    struct name *h_bcc;        /* Blind carbon copies */
1784    struct name *h_ref;        /* References (possibly overridden) */
1785    struct attachment *h_attach; /* MIME attachments */
1786    char        *h_charset;    /* preferred charset */
1787    struct name *h_from;       /* overridden "From:" field */
1788    struct name *h_sender;     /* overridden "Sender:" field */
1789    struct name *h_replyto;    /* overridden "Reply-To:" field */
1790    struct name *h_message_id; /* overridden "Message-ID:" field */
1791    struct name *h_in_reply_to;/* overridden "In-Reply-To:" field */
1792    struct name *h_mft;        /* Mail-Followup-To */
1793    char const  *h_list_post;  /* Address from List-Post:, for `Lreply' */
1794    struct n_header_field *h_user_headers;
1795    struct n_header_field *h_custom_headers; /* (Cached result) */
1796 };
1797
1798 /* Handling of namelist nodes used in processing the recipients of mail and
1799  * aliases, inspection of mail-addresses and all that kind of stuff */
1800 enum nameflags {
1801    NAME_NAME_SALLOC        = 1<< 0, /* .n_name is doped */
1802    NAME_FULLNAME_SALLOC    = 1<< 1, /* .n_fullname is doped */
1803    NAME_SKINNED            = 1<< 2, /* Is actually skin()ned */
1804    NAME_IDNA               = 1<< 3, /* IDNA was applied */
1805
1806    NAME_ADDRSPEC_CHECKED   = 1<< 4, /* Address has been .. and */
1807    NAME_ADDRSPEC_ISFILE    = 1<< 5, /* ..is a file path */
1808    NAME_ADDRSPEC_ISPIPE    = 1<< 6, /* ..is a command for piping */
1809    NAME_ADDRSPEC_ISFILEORPIPE = NAME_ADDRSPEC_ISFILE | NAME_ADDRSPEC_ISPIPE,
1810    NAME_ADDRSPEC_ISNAME    = 1<< 7, /* ..is a valid mail network address */
1811    NAME_ADDRSPEC_ISADDR    = 1<< 8, /* ..is a valid mail network address */
1812
1813    NAME_ADDRSPEC_ERR_EMPTY = 1<< 9, /* An empty string (or NULL) */
1814    NAME_ADDRSPEC_ERR_ATSEQ = 1<<10, /* Weird @ sequence */
1815    NAME_ADDRSPEC_ERR_CHAR  = 1<<11, /* Invalid character */
1816    NAME_ADDRSPEC_ERR_IDNA  = 1<<12, /* IDNA convertion failed */
1817    NAME_ADDRSPEC_INVALID   = NAME_ADDRSPEC_ERR_EMPTY |
1818          NAME_ADDRSPEC_ERR_ATSEQ | NAME_ADDRSPEC_ERR_CHAR |
1819          NAME_ADDRSPEC_ERR_IDNA,
1820
1821    /* Error storage (we must fit in 31-bit) */
1822    _NAME_SHIFTWC  = 13,
1823    _NAME_MAXWC    = 0x3FFFF,
1824    _NAME_MASKWC   = _NAME_MAXWC << _NAME_SHIFTWC
1825 };
1826
1827 /* In the !_ERR_EMPTY case, the failing character can be queried */
1828 #define NAME_ADDRSPEC_ERR_GETWC(F)  \
1829    ((((unsigned int)(F) & _NAME_MASKWC) >> _NAME_SHIFTWC) & _NAME_MAXWC)
1830 #define NAME_ADDRSPEC_ERR_SET(F, E, WC) \
1831 do {\
1832    (F) = ((F) & ~(NAME_ADDRSPEC_INVALID | _NAME_MASKWC)) |\
1833          (E) | (((unsigned int)(WC) & _NAME_MAXWC) << _NAME_SHIFTWC);\
1834 } while (0)
1835
1836 struct name {
1837    struct name *n_flink;      /* Forward link in list. */
1838    struct name *n_blink;      /* Backward list link */
1839    enum gfield n_type;        /* From which list it came */
1840    enum nameflags n_flags;    /* enum nameflags */
1841    char        *n_name;       /* This fella's address */
1842    char        *n_fullname;   /* Ditto, unless GFULL including comment */
1843    char        *n_fullextra;  /* GFULL, without address */
1844 };
1845
1846 struct addrguts {
1847    char const  *ag_input;     /* Input string as given */
1848    size_t      ag_ilen;       /* strlen() of input */
1849    size_t      ag_iaddr_start; /* Start of *addr-spec* in .ag_input */
1850    size_t      ag_iaddr_aend; /* ..and one past its end */
1851    char        *ag_skinned;   /* Output (alloced if !=.ag_input) */
1852    size_t      ag_slen;       /* strlen() of .ag_skinned */
1853    size_t      ag_sdom_start; /* Start of domain in .ag_skinned, */
1854    enum nameflags ag_n_flags; /* enum nameflags of .ag_skinned */
1855 };
1856
1857 /* MIME attachments */
1858 enum attach_conv {
1859    AC_DEFAULT,       /* _get_lc() -> _iter_*() */
1860    AC_FIX_OUTCS,     /* _get_lc() -> "charset=" .a_charset */
1861    AC_FIX_INCS,      /* "charset=".a_input_charset (nocnv) */
1862    AC_TMPFILE        /* attachment.a_tmpf is converted */
1863 };
1864
1865 struct attachment {
1866    struct attachment *a_flink;   /* Forward link in list. */
1867    struct attachment *a_blink;   /* Backward list link */
1868    char const  *a_name;       /* file name */
1869    char const  *a_content_type;  /* content type */
1870    char const  *a_content_disposition; /* content disposition */
1871    char const  *a_content_id; /* content id */
1872    char const  *a_content_description; /* content description */
1873    char const  *a_input_charset; /* Interpretation depends on .a_conv */
1874    char const  *a_charset;    /* ... */
1875    FILE        *a_tmpf;       /* If AC_TMPFILE */
1876    enum attach_conv a_conv;   /* User chosen conversion */
1877    int         a_msgno;       /* message number */
1878 };
1879
1880 struct sendbundle {
1881    struct header  *sb_hp;
1882    struct name    *sb_to;
1883    FILE           *sb_input;
1884    struct str     sb_signer;  /* USER@HOST for signing+ */
1885    struct url     sb_url;
1886    struct ccred   sb_ccred;
1887 };
1888
1889 /* Structure of the hash table of ignored header fields */
1890 struct ignoretab {
1891    int         i_count;       /* Number of entries */
1892    struct ignored {
1893       struct ignored *i_link;    /* Next ignored field in bucket */
1894       char           *i_field;   /* This ignored field */
1895    }           *i_head[HSHSIZE];
1896 };
1897
1898 /* For saving the current directory and later returning */
1899 struct cw {
1900 #ifdef HAVE_FCHDIR
1901    int         cw_fd;
1902 #else
1903    char        cw_wd[PATH_MAX];
1904 #endif
1905 };
1906
1907 /*
1908  * Global variable declarations
1909  *
1910  * These become instantiated in main.c.
1911  */
1912
1913 #undef VL
1914 #ifdef n_MAIN_SOURCE
1915 # ifndef HAVE_AMALGAMATION
1916 #  define VL
1917 # else
1918 #  define VL            static
1919 # endif
1920 #else
1921 # define VL             extern
1922 #endif
1923
1924 VL int         mb_cur_max;          /* Value of MB_CUR_MAX */
1925 VL int         realscreenheight;    /* The real screen height */
1926 VL int         scrnwidth;           /* Screen width, or best guess */
1927 VL int         scrnheight;          /* Screen height/guess (4 header) */
1928
1929 VL char const  *homedir;            /* Path name of home directory */
1930 VL char const  *myname;             /* My login name */
1931 VL char const  *progname;           /* Our name */
1932 VL char const  *tempdir;            /* The temporary directory */
1933
1934 VL gid_t       group_id;            /* getgid() and getuid() */
1935 VL uid_t       user_id;
1936
1937 VL int         exit_status;         /* Exit status */
1938 VL ui32_t      options;             /* Bits of enum user_options */
1939 VL struct name *option_r_arg;       /* Argument to -r option */
1940 VL char const  **smopts;            /* sendmail(1) opts from commline */
1941 VL size_t      smopts_count;        /* Entries in smopts */
1942
1943 VL ui32_t      pstate;              /* Bits of enum program_state */
1944 VL size_t      noreset;             /* String resets suspended (recursive) */
1945
1946 /* XXX stylish sorting */
1947 VL int            msgCount;            /* Count of messages read in */
1948 VL struct mailbox mb;                  /* Current mailbox */
1949 VL int            image;               /* File descriptor for msg image */
1950 VL char           mailname[PATH_MAX];  /* Name of current file TODO URL/object*/
1951 VL char           displayname[80 - 40]; /* Prettyfied for display TODO URL/obj*/
1952 VL char           prevfile[PATH_MAX];  /* Name of previous file TODO URL/obj */
1953 VL char const     *account_name;       /* Current account name or NULL */
1954 VL off_t          mailsize;            /* Size of system mailbox */
1955 VL struct message *dot;                /* Pointer to current message */
1956 VL struct message *prevdot;            /* Previous current message */
1957 VL struct message *message;            /* The actual message structure */
1958 VL struct message *threadroot;         /* first threaded message */
1959
1960 VL struct ignoretab  ignore[2];        /* ignored and retained fields
1961                                         * 0 is ignore, 1 is retain */
1962 VL struct ignoretab  saveignore[2];    /* ignored and retained fields
1963                                         * on save to folder */
1964 VL struct ignoretab  allignore[2];     /* special, ignore all headers */
1965 VL struct ignoretab  fwdignore[2];     /* fields to ignore for forwarding */
1966
1967 VL struct time_current  time_current;  /* time(3); send: mail1() XXXcarrier */
1968 VL struct termios_state termios_state; /* getpassword(); see commands().. */
1969
1970 #ifdef HAVE_SSL
1971 VL enum ssl_verify_level   ssl_verify_level; /* SSL verification level */
1972 #endif
1973
1974 #ifdef HAVE_ICONV
1975 VL iconv_t     iconvd;
1976 #endif
1977
1978 VL sigjmp_buf  srbuf;
1979 VL int         interrupts;
1980 VL sighandler_type dflpipe;
1981 VL sighandler_type handlerstacktop;
1982 #define handlerpush(f)  (savedtop = handlerstacktop, handlerstacktop = (f))
1983 #define handlerpop()    (handlerstacktop = savedtop)
1984
1985 /* TODO Temporary hacks unless the codebase doesn't jump and uses pass-by-value
1986  * TODO carrier structs instead of locals */
1987 VL char        *temporary_arg_v_store;
1988 VL void        *temporary_localopts_store;
1989 /* TODO temporary storage to overcome which_protocol() mess (for PROTO_FILE) */
1990 VL char const  *temporary_protocol_ext;
1991
1992 /* The remaining variables need initialization */
1993
1994 #ifndef HAVE_AMALGAMATION
1995 VL char const  month_names[12 + 1][4];
1996 VL char const  weekday_names[7 + 1][4];
1997
1998 VL char const  uagent[sizeof UAGENT];
1999
2000 VL uc_i const  class_char[1 + 0x7F];
2001 #endif
2002
2003 /*
2004  * Finally, let's include the function prototypes XXX embed
2005  */
2006
2007 #ifndef n_PRIVSEP_SOURCE
2008 # include "nailfuns.h"
2009 #endif
2010
2011 /* s-it-mode */