lib-src/fakemail.c

   1 /* sendmail-like interface to /bin/mail for system V,
   2    Copyright (C) 1985, 1994, 1999 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Emacs is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs; see the file COPYING.  If not, write to
  18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21
  22 /* This is needed to get the declaration of cuserid in GNU libc.  */
  23 #define _XOPEN_SOURCE 1
  24
  25 #define NO_SHORTNAMES
  26 #include <../src/config.h>
  27
  28 #if defined (BSD_SYSTEM) && !defined (BSD4_1) && !defined (USE_FAKEMAIL)
  29 /* This program isnot used in BSD, so just avoid loader complaints.  */
  30 int
  31 main ()
  32 {
  33   return 0;
  34 }
  35 #else /* not BSD 4.2 (or newer) */
  36 #ifdef MSDOS
  37 int
  38 main ()
  39 {
  40   return 0;
  41 }
  42 #else /* not MSDOS */
  43 /* This conditional contains all the rest of the file.  */
  44
  45 /* These are defined in config in some versions. */
  46
  47 #ifdef static
  48 #undef static
  49 #endif
  50
  51 #ifdef WINDOWSNT
  52 #include "ntlib.h"
  53 #endif
  54
  55 #include <stdio.h>
  56 #include <string.h>
  57 #include <ctype.h>
  58 #include <time.h>
  59 #include <pwd.h>
  60
  61 /* This is to declare cuserid.  */
  62 #ifdef HAVE_UNISTD_H
  63 #include <unistd.h>
  64 #endif
  65 \f
  66 /* Type definitions */
  67
  68 #define boolean int
  69 #define true 1
  70 #define false 0
  71
  72 /* Various lists */
  73
  74 struct line_record
  75 {
  76   char *string;
  77   struct line_record *continuation;
  78 };
  79 typedef struct line_record *line_list;
  80
  81 struct header_record
  82 {
  83   line_list text;
  84   struct header_record *next;
  85   struct header_record *previous;
  86 };
  87 typedef struct header_record *header;
  88
  89 struct stream_record
  90 {
  91   FILE *handle;
  92   int (*action)();
  93   struct stream_record *rest_streams;
  94 };
  95 typedef struct stream_record *stream_list;
  96
  97 /* A `struct linebuffer' is a structure which holds a line of text.
  98  * `readline' reads a line from a stream into a linebuffer
  99  * and works regardless of the length of the line.
 100  */
 101
 102 struct linebuffer
 103 {
 104   long size;
 105   char *buffer;
 106 };
 107
 108 struct linebuffer lb;
 109
 110 #define new_list()                                      \
 111   ((line_list) xmalloc (sizeof (struct line_record)))
 112 #define new_header()                            \
 113   ((header) xmalloc (sizeof (struct header_record)))
 114 #define new_stream()                            \
 115   ((stream_list) xmalloc (sizeof (struct stream_record)))
 116 #define alloc_string(nchars)                            \
 117   ((char *) xmalloc ((nchars) + 1))
 118 \f
 119 /* Global declarations */
 120
 121 #define BUFLEN 1024
 122 #define KEYWORD_SIZE 256
 123 #define FROM_PREFIX "From"
 124 #define MY_NAME "fakemail"
 125 #define NIL ((line_list) NULL)
 126 #define INITIAL_LINE_SIZE 200
 127
 128 #ifndef MAIL_PROGRAM_NAME
 129 #define MAIL_PROGRAM_NAME "/bin/mail"
 130 #endif
 131
 132 static char *my_name;
 133 static char *the_date;
 134 static char *the_user;
 135 static line_list file_preface;
 136 static stream_list the_streams;
 137 static boolean no_problems = true;
 138
 139 extern FILE *popen ();
 140 extern int fclose (), pclose ();
 141
 142 #ifdef CURRENT_USER
 143 extern struct passwd *getpwuid ();
 144 extern unsigned short geteuid ();
 145 static struct passwd *my_entry;
 146 #define cuserid(s)                              \
 147 (my_entry = getpwuid (((int) geteuid ())),      \
 148  my_entry->pw_name)
 149 #endif
 150 \f
 151 /* Utilities */
 152
 153 /* Print error message.  `s1' is printf control string, `s2' is arg for it. */
 154
 155 static void
 156 error (s1, s2)
 157      char *s1, *s2;
 158 {
 159   printf ("%s: ", my_name);
 160   printf (s1, s2);
 161   printf ("\n");
 162   no_problems = false;
 163 }
 164
 165 /* Print error message and exit.  */
 166
 167 static void
 168 fatal (s1, s2)
 169      char *s1, *s2;
 170 {
 171   error (s1, s2);
 172   exit (1);
 173 }
 174
 175 /* Like malloc but get fatal error if memory is exhausted.  */
 176
 177 static long *
 178 xmalloc (size)
 179      int size;
 180 {
 181   long *result = (long *) malloc (((unsigned) size));
 182   if (result == ((long *) NULL))
 183     fatal ("virtual memory exhausted", 0);
 184   return result;
 185 }
 186
 187 static long *
 188 xrealloc (ptr, size)
 189      long *ptr;
 190      int size;
 191 {
 192   long *result = (long *) realloc (ptr, ((unsigned) size));
 193   if (result == ((long *) NULL))
 194     fatal ("virtual memory exhausted");
 195   return result;
 196 }
 197 \f
 198 /* Initialize a linebuffer for use */
 199
 200 void
 201 init_linebuffer (linebuffer)
 202      struct linebuffer *linebuffer;
 203 {
 204   linebuffer->size = INITIAL_LINE_SIZE;
 205   linebuffer->buffer = ((char *) xmalloc (INITIAL_LINE_SIZE));
 206 }
 207
 208 /* Read a line of text from `stream' into `linebuffer'.
 209  * Return the length of the line.
 210  */
 211
 212 long
 213 readline (linebuffer, stream)
 214      struct linebuffer *linebuffer;
 215      FILE *stream;
 216 {
 217   char *buffer = linebuffer->buffer;
 218   char *p = linebuffer->buffer;
 219   char *end = p + linebuffer->size;
 220
 221   while (true)
 222     {
 223       int c = getc (stream);
 224       if (p == end)
 225         {
 226           linebuffer->size *= 2;
 227           buffer = ((char *) xrealloc ((long *)buffer, linebuffer->size));
 228           p = buffer + (p - linebuffer->buffer);
 229           end = buffer + linebuffer->size;
 230           linebuffer->buffer = buffer;
 231         }
 232       if (c < 0 || c == '\n')
 233         {
 234           *p = 0;
 235           break;
 236         }
 237       *p++ = c;
 238     }
 239
 240   return p - buffer;
 241 }
 242 \f
 243 /* Extract a colon-terminated keyword from the string FIELD.
 244    Return that keyword as a string stored in a static buffer.
 245    Store the address of the rest of the string into *REST.
 246
 247    If there is no keyword, return NULL and don't alter *REST.  */
 248
 249 char *
 250 get_keyword (field, rest)
 251      register char *field;
 252      char **rest;
 253 {
 254   static char keyword[KEYWORD_SIZE];
 255   register char *ptr;
 256   register int c;
 257
 258   ptr = &keyword[0];
 259   c = (unsigned char) *field++;
 260   if (isspace (c) || c == ':')
 261     return ((char *) NULL);
 262   *ptr++ = (islower (c) ? toupper (c) : c);
 263   while (((c = (unsigned char) *field++) != ':') && ! isspace (c))
 264     *ptr++ = (islower (c) ? toupper (c) : c);
 265   *ptr++ = '\0';
 266   while (isspace (c))
 267     c = (unsigned char) *field++;
 268   if (c != ':')
 269     return ((char *) NULL);
 270   *rest = field;
 271   return &keyword[0];
 272 }
 273
 274 /* Nonzero if the string FIELD starts with a colon-terminated keyword.  */
 275
 276 boolean
 277 has_keyword (field)
 278      char *field;
 279 {
 280   char *ignored;
 281   return (get_keyword (field, &ignored) != ((char *) NULL));
 282 }
 283
 284 /* Store the string FIELD, followed by any lines in THE_LIST,
 285    into the buffer WHERE.
 286    Concatenate lines, putting just a space between them.
 287    Delete everything contained in parentheses.
 288    When a recipient name contains <...>, we discard
 289    everything except what is inside the <...>.
 290
 291    We don't pay attention to overflowing WHERE;
 292    the caller has to make it big enough.  */
 293
 294 char *
 295 add_field (the_list, field, where)
 296      line_list the_list;
 297      register char *field, *where;
 298 {
 299   register char c;
 300   while (true)
 301     {
 302       char *this_recipient_where;
 303       int in_quotes = 0;
 304
 305       *where++ = ' ';
 306       this_recipient_where = where;
 307
 308       while ((c = *field++) != '\0')
 309         {
 310           if (c == '\\')
 311             *where++ = c;
 312           else if (c == '"')
 313             {
 314               in_quotes = ! in_quotes;
 315               *where++ = c;
 316             }
 317           else if (in_quotes)
 318             *where++ = c;
 319           else if (c == '(')
 320             {
 321               while (*field && *field != ')') ++field;
 322               if (! (*field++)) break; /* no close */
 323               continue;
 324             }
 325           else if (c == ',')
 326             {
 327               *where++ = ' ';
 328               /* When we get to the end of one recipient,
 329                  don't discard it if the next one has <...>.  */
 330               this_recipient_where = where;
 331             }
 332           else if (c == '<')
 333             /* Discard everything we got before the `<'.  */
 334             where = this_recipient_where;
 335           else if (c == '>')
 336             /* Discard the rest of this name that follows the `>'.  */
 337             {
 338               while (*field && *field != ',') ++field;
 339               if (! (*field++)) break; /* no comma */
 340               continue;
 341             }
 342           else
 343             *where++ = c;
 344         }
 345       if (the_list == NIL) break;
 346       field = the_list->string;
 347       the_list = the_list->continuation;
 348     }
 349   return where;
 350 }
 351 \f
 352 line_list
 353 make_file_preface ()
 354 {
 355   char *the_string, *temp;
 356   long idiotic_interface;
 357   long prefix_length;
 358   long user_length;
 359   long date_length;
 360   line_list result;
 361
 362   prefix_length = strlen (FROM_PREFIX);
 363   time (&idiotic_interface);
 364   the_date = ctime (&idiotic_interface);
 365   /* the_date has an unwanted newline at the end */
 366   date_length = strlen (the_date) - 1;
 367   the_date[date_length] = '\0';
 368   temp = cuserid ((char *) NULL);
 369   user_length = strlen (temp);
 370   the_user = alloc_string (user_length + 1);
 371   strcpy (the_user, temp);
 372   the_string = alloc_string (3 + prefix_length
 373                              + user_length
 374                              + date_length);
 375   temp = the_string;
 376   strcpy (temp, FROM_PREFIX);
 377   temp = &temp[prefix_length];
 378   *temp++ = ' ';
 379   strcpy (temp, the_user);
 380   temp = &temp[user_length];
 381   *temp++ = ' ';
 382   strcpy (temp, the_date);
 383   result = new_list ();
 384   result->string = the_string;
 385   result->continuation = ((line_list) NULL);
 386   return result;
 387 }
 388
 389 void
 390 write_line_list (the_list, the_stream)
 391      register line_list the_list;
 392      FILE *the_stream;
 393 {
 394   for ( ;
 395       the_list != ((line_list) NULL) ;
 396       the_list = the_list->continuation)
 397     {
 398       fputs (the_list->string, the_stream);
 399       putc ('\n', the_stream);
 400     }
 401   return;
 402 }
 403 \f
 404 int
 405 close_the_streams ()
 406 {
 407   register stream_list rem;
 408   for (rem = the_streams;
 409        rem != ((stream_list) NULL);
 410        rem = rem->rest_streams)
 411     no_problems = (no_problems &&
 412                    ((*rem->action) (rem->handle) == 0));
 413   the_streams = ((stream_list) NULL);
 414   return (no_problems ? 0 : 1);
 415 }
 416
 417 void
 418 add_a_stream (the_stream, closing_action)
 419      FILE *the_stream;
 420      int (*closing_action)();
 421 {
 422   stream_list old = the_streams;
 423   the_streams = new_stream ();
 424   the_streams->handle = the_stream;
 425   the_streams->action = closing_action;
 426   the_streams->rest_streams = old;
 427   return;
 428 }
 429
 430 int
 431 my_fclose (the_file)
 432      FILE *the_file;
 433 {
 434   putc ('\n', the_file);
 435   fflush (the_file);
 436   return fclose (the_file);
 437 }
 438
 439 boolean
 440 open_a_file (name)
 441      char *name;
 442 {
 443   FILE *the_stream = fopen (name, "a");
 444   if (the_stream != ((FILE *) NULL))
 445     {
 446       add_a_stream (the_stream, my_fclose);
 447       if (the_user == ((char *) NULL))
 448         file_preface = make_file_preface ();
 449       write_line_list (file_preface, the_stream);
 450       return true;
 451     }
 452   return false;
 453 }
 454
 455 void
 456 put_string (s)
 457      char *s;
 458 {
 459   register stream_list rem;
 460   for (rem = the_streams;
 461        rem != ((stream_list) NULL);
 462        rem = rem->rest_streams)
 463     fputs (s, rem->handle);
 464   return;
 465 }
 466
 467 void
 468 put_line (string)
 469      char *string;
 470 {
 471   register stream_list rem;
 472   for (rem = the_streams;
 473        rem != ((stream_list) NULL);
 474        rem = rem->rest_streams)
 475     {
 476       char *s = string;
 477       int column = 0;
 478
 479       /* Divide STRING into lines.  */
 480       while (*s != 0)
 481         {
 482           char *breakpos;
 483
 484           /* Find the last char that fits.  */
 485           for (breakpos = s; *breakpos && column < 78; ++breakpos)
 486             {
 487               if (*breakpos == '\t')
 488                 column += 8;
 489               else
 490                 column++;
 491             }
 492           /* If we didn't reach end of line, break the line.  */
 493           if (*breakpos)
 494             {
 495               /* Back up to just after the last comma that fits.  */
 496               while (breakpos != s && breakpos[-1] != ',') --breakpos;
 497
 498               if (breakpos == s)
 499                 {
 500                   /* If no comma fits, move past the first address anyway.  */
 501                   while (*breakpos != 0 && *breakpos != ',') ++breakpos;
 502                   if (*breakpos != 0)
 503                     /* Include the comma after it.  */
 504                     ++breakpos;
 505                 }
 506             }
 507           /* Output that much, then break the line.  */
 508           fwrite (s, 1, breakpos - s, rem->handle);
 509           column = 8;
 510
 511           /* Skip whitespace and prepare to print more addresses.  */
 512           s = breakpos;
 513           while (*s == ' ' || *s == '\t') ++s;
 514           if (*s != 0)
 515             fputs ("\n\t", rem->handle);
 516         }
 517       putc ('\n', rem->handle);
 518     }
 519   return;
 520 }
 521 \f
 522 #define mail_error error
 523
 524 /* Handle an FCC field.  FIELD is the text of the first line (after
 525    the header name), and THE_LIST holds the continuation lines if any.
 526    Call open_a_file for each file.  */
 527
 528 void
 529 setup_files (the_list, field)
 530      register line_list the_list;
 531      register char *field;
 532 {
 533   register char *start;
 534   register char c;
 535   while (true)
 536     {
 537       while (((c = *field) != '\0')
 538              && (c == ' '
 539                  || c == '\t'
 540                  || c == ','))
 541         field += 1;
 542       if (c != '\0')
 543         {
 544           start = field;
 545           while (((c = *field) != '\0')
 546                  && c != ' '
 547                  && c != '\t'
 548                  && c != ',')
 549             field += 1;
 550           *field = '\0';
 551           if (!open_a_file (start))
 552             mail_error ("Could not open file %s", start);
 553           *field = c;
 554           if (c != '\0') continue;
 555         }
 556       if (the_list == ((line_list) NULL))
 557         return;
 558       field = the_list->string;
 559       the_list = the_list->continuation;
 560     }
 561 }
 562 \f
 563 /* Compute the total size of all recipient names stored in THE_HEADER.
 564    The result says how big to make the buffer to pass to parse_header.  */
 565
 566 int
 567 args_size (the_header)
 568      header the_header;
 569 {
 570   register header old = the_header;
 571   register line_list rem;
 572   register int size = 0;
 573   do
 574     {
 575       char *field;
 576       register char *keyword = get_keyword (the_header->text->string, &field);
 577       if ((strcmp (keyword, "TO") == 0)
 578           || (strcmp (keyword, "CC") == 0)
 579           || (strcmp (keyword, "BCC") == 0))
 580         {
 581           size += 1 + strlen (field);
 582           for (rem = the_header->text->continuation;
 583                rem != NIL;
 584                rem = rem->continuation)
 585             size += 1 + strlen (rem->string);
 586         }
 587       the_header = the_header->next;
 588     } while (the_header != old);
 589   return size;
 590 }
 591
 592 /* Scan the header described by the lists THE_HEADER,
 593    and put all recipient names into the buffer WHERE.
 594    Precede each recipient name with a space.
 595
 596    Also, if the header has any FCC fields, call setup_files for each one.  */
 597
 598 void
 599 parse_header (the_header, where)
 600      header the_header;
 601      register char *where;
 602 {
 603   register header old = the_header;
 604   do
 605     {
 606       char *field;
 607       register char *keyword = get_keyword (the_header->text->string, &field);
 608       if (strcmp (keyword, "TO") == 0)
 609         where = add_field (the_header->text->continuation, field, where);
 610       else if (strcmp (keyword, "CC") == 0)
 611         where = add_field (the_header->text->continuation, field, where);
 612       else if (strcmp (keyword, "BCC") == 0)
 613         {
 614           where = add_field (the_header->text->continuation, field, where);
 615           the_header->previous->next = the_header->next;
 616           the_header->next->previous = the_header->previous;
 617         }
 618       else if (strcmp (keyword, "FCC") == 0)
 619         setup_files (the_header->text->continuation, field);
 620       the_header = the_header->next;
 621     } while (the_header != old);
 622   *where = '\0';
 623   return;
 624 }
 625 \f
 626 /* Read lines from the input until we get a blank line.
 627    Create a list of `header' objects, one for each header field,
 628    each of which points to a list of `line_list' objects,
 629    one for each line in that field.
 630    Continuation lines are grouped in the headers they continue.  */
 631
 632 header
 633 read_header ()
 634 {
 635   register header the_header = ((header) NULL);
 636   register line_list *next_line = ((line_list *) NULL);
 637
 638   init_linebuffer (&lb);
 639
 640   do
 641     {
 642       long length;
 643       register char *line;
 644
 645       readline (&lb, stdin);
 646       line = lb.buffer;
 647       length = strlen (line);
 648       if (length == 0) break;
 649
 650       if (has_keyword (line))
 651         {
 652           register header old = the_header;
 653           the_header = new_header ();
 654           if (old == ((header) NULL))
 655             {
 656               the_header->next = the_header;
 657               the_header->previous = the_header;
 658             }
 659           else
 660             {
 661               the_header->previous = old;
 662               the_header->next = old->next;
 663               old->next = the_header;
 664             }
 665           next_line = &(the_header->text);
 666         }
 667
 668       if (next_line == ((line_list *) NULL))
 669         {
 670           /* Not a valid header */
 671           exit (1);
 672         }
 673       *next_line = new_list ();
 674       (*next_line)->string = alloc_string (length);
 675       strcpy (((*next_line)->string), line);
 676       next_line = &((*next_line)->continuation);
 677       *next_line = NIL;
 678
 679     } while (true);
 680
 681   return the_header->next;
 682 }
 683 \f
 684 void
 685 write_header (the_header)
 686      header the_header;
 687 {
 688   register header old = the_header;
 689   do
 690     {
 691       register line_list the_list;
 692       for (the_list = the_header->text;
 693            the_list != NIL;
 694            the_list = the_list->continuation)
 695         put_line (the_list->string);
 696       the_header = the_header->next;
 697     } while (the_header != old);
 698   put_line ("");
 699   return;
 700 }
 701 \f
 702 int
 703 main (argc, argv)
 704      int argc;
 705      char **argv;
 706 {
 707   char *command_line;
 708   header the_header;
 709   long name_length;
 710   char *mail_program_name;
 711   char buf[BUFLEN + 1];
 712   register int size;
 713   FILE *the_pipe;
 714
 715   extern char *getenv ();
 716
 717   mail_program_name = getenv ("FAKEMAILER");
 718   if (!(mail_program_name && *mail_program_name))
 719     mail_program_name = MAIL_PROGRAM_NAME;
 720   name_length = strlen (mail_program_name);
 721
 722   my_name = MY_NAME;
 723   the_streams = ((stream_list) NULL);
 724   the_date = ((char *) NULL);
 725   the_user = ((char *) NULL);
 726
 727   the_header = read_header ();
 728   command_line = alloc_string (name_length + args_size (the_header));
 729   strcpy (command_line, mail_program_name);
 730   parse_header (the_header, &command_line[name_length]);
 731
 732   the_pipe = popen (command_line, "w");
 733   if (the_pipe == ((FILE *) NULL))
 734     fatal ("cannot open pipe to real mailer");
 735
 736   add_a_stream (the_pipe, pclose);
 737
 738   write_header (the_header);
 739
 740   /* Dump the message itself */
 741
 742   while (!feof (stdin))
 743     {
 744       size = fread (buf, 1, BUFLEN, stdin);
 745       buf[size] = '\0';
 746       put_string (buf);
 747     }
 748
 749   exit (close_the_streams ());
 750 }
 751
 752 #endif /* not MSDOS */
 753 #endif /* not BSD 4.2 (or newer) */