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 #define NO_SHORTNAMES
  22 #define _XOPEN_SOURCE 500       /* for cuserid */
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  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 long
 212 readline (linebuffer, stream)
 213      struct linebuffer *linebuffer;
 214      FILE *stream;
 215 {
 216   char *buffer = linebuffer->buffer;
 217   char *p = linebuffer->buffer;
 218   char *end = p + linebuffer->size;
 219
 220   while (true)
 221     {
 222       int c = getc (stream);
 223       if (p == end)
 224         {
 225           linebuffer->size *= 2;
 226           buffer = ((char *) xrealloc ((long *)buffer, linebuffer->size));
 227           p = buffer + (p - linebuffer->buffer);
 228           end = buffer + linebuffer->size;
 229           linebuffer->buffer = buffer;
 230         }
 231       if (c < 0 || c == '\n')
 232         {
 233           *p = 0;
 234           break;
 235         }
 236       *p++ = c;
 237     }
 238
 239   return p - buffer;
 240 }
 241 \f
 242 /* Extract a colon-terminated keyword from the string FIELD.
 243    Return that keyword as a string stored in a static buffer.
 244    Store the address of the rest of the string into *REST.
 245
 246    If there is no keyword, return NULL and don't alter *REST.  */
 247
 248 char *
 249 get_keyword (field, rest)
 250      register char *field;
 251      char **rest;
 252 {
 253   static char keyword[KEYWORD_SIZE];
 254   register char *ptr;
 255   register int c;
 256
 257   ptr = &keyword[0];
 258   c = (unsigned char) *field++;
 259   if (isspace (c) || c == ':')
 260     return ((char *) NULL);
 261   *ptr++ = (islower (c) ? toupper (c) : c);
 262   while (((c = (unsigned char) *field++) != ':') && ! isspace (c))
 263     *ptr++ = (islower (c) ? toupper (c) : c);
 264   *ptr++ = '\0';
 265   while (isspace (c))
 266     c = (unsigned char) *field++;
 267   if (c != ':')
 268     return ((char *) NULL);
 269   *rest = field;
 270   return &keyword[0];
 271 }
 272
 273 /* Nonzero if the string FIELD starts with a colon-terminated keyword.  */
 274
 275 boolean
 276 has_keyword (field)
 277      char *field;
 278 {
 279   char *ignored;
 280   return (get_keyword (field, &ignored) != ((char *) NULL));
 281 }
 282
 283 /* Store the string FIELD, followed by any lines in THE_LIST,
 284    into the buffer WHERE.
 285    Concatenate lines, putting just a space between them.
 286    Delete everything contained in parentheses.
 287    When a recipient name contains <...>, we discard
 288    everything except what is inside the <...>.
 289
 290    We don't pay attention to overflowing WHERE;
 291    the caller has to make it big enough.  */
 292
 293 char *
 294 add_field (the_list, field, where)
 295      line_list the_list;
 296      register char *field, *where;
 297 {
 298   register char c;
 299   while (true)
 300     {
 301       char *this_recipient_where;
 302       int in_quotes = 0;
 303
 304       *where++ = ' ';
 305       this_recipient_where = where;
 306
 307       while ((c = *field++) != '\0')
 308         {
 309           if (c == '\\')
 310             *where++ = c;
 311           else if (c == '"')
 312             {
 313               in_quotes = ! in_quotes;
 314               *where++ = c;
 315             }
 316           else if (in_quotes)
 317             *where++ = c;
 318           else if (c == '(')
 319             {
 320               while (*field && *field != ')') ++field;
 321               if (! (*field++)) break; /* no close */
 322               continue;
 323             }
 324           else if (c == ',')
 325             {
 326               *where++ = ' ';
 327               /* When we get to the end of one recipient,
 328                  don't discard it if the next one has <...>.  */
 329               this_recipient_where = where;
 330             }
 331           else if (c == '<')
 332             /* Discard everything we got before the `<'.  */
 333             where = this_recipient_where;
 334           else if (c == '>')
 335             /* Discard the rest of this name that follows the `>'.  */
 336             {
 337               while (*field && *field != ',') ++field;
 338               if (! (*field++)) break; /* no comma */
 339               continue;
 340             }
 341           else
 342             *where++ = c;
 343         }
 344       if (the_list == NIL) break;
 345       field = the_list->string;
 346       the_list = the_list->continuation;
 347     }
 348   return where;
 349 }
 350 \f
 351 line_list
 352 make_file_preface ()
 353 {
 354   char *the_string, *temp;
 355   long idiotic_interface;
 356   long prefix_length;
 357   long user_length;
 358   long date_length;
 359   line_list result;
 360
 361   prefix_length = strlen (FROM_PREFIX);
 362   time (&idiotic_interface);
 363   the_date = ctime (&idiotic_interface);
 364   /* the_date has an unwanted newline at the end */
 365   date_length = strlen (the_date) - 1;
 366   the_date[date_length] = '\0';
 367   temp = cuserid ((char *) NULL);
 368   user_length = strlen (temp);
 369   the_user = alloc_string (user_length + 1);
 370   strcpy (the_user, temp);
 371   the_string = alloc_string (3 + prefix_length
 372                              + user_length
 373                              + date_length);
 374   temp = the_string;
 375   strcpy (temp, FROM_PREFIX);
 376   temp = &temp[prefix_length];
 377   *temp++ = ' ';
 378   strcpy (temp, the_user);
 379   temp = &temp[user_length];
 380   *temp++ = ' ';
 381   strcpy (temp, the_date);
 382   result = new_list ();
 383   result->string = the_string;
 384   result->continuation = ((line_list) NULL);
 385   return result;
 386 }
 387
 388 void
 389 write_line_list (the_list, the_stream)
 390      register line_list the_list;
 391      FILE *the_stream;
 392 {
 393   for ( ;
 394       the_list != ((line_list) NULL) ;
 395       the_list = the_list->continuation)
 396     {
 397       fputs (the_list->string, the_stream);
 398       putc ('\n', the_stream);
 399     }
 400   return;
 401 }
 402 \f
 403 int
 404 close_the_streams ()
 405 {
 406   register stream_list rem;
 407   for (rem = the_streams;
 408        rem != ((stream_list) NULL);
 409        rem = rem->rest_streams)
 410     no_problems = (no_problems &&
 411                    ((*rem->action) (rem->handle) == 0));
 412   the_streams = ((stream_list) NULL);
 413   return (no_problems ? 0 : 1);
 414 }
 415
 416 void
 417 add_a_stream (the_stream, closing_action)
 418      FILE *the_stream;
 419      int (*closing_action)();
 420 {
 421   stream_list old = the_streams;
 422   the_streams = new_stream ();
 423   the_streams->handle = the_stream;
 424   the_streams->action = closing_action;
 425   the_streams->rest_streams = old;
 426   return;
 427 }
 428
 429 int
 430 my_fclose (the_file)
 431      FILE *the_file;
 432 {
 433   putc ('\n', the_file);
 434   fflush (the_file);
 435   return fclose (the_file);
 436 }
 437
 438 boolean
 439 open_a_file (name)
 440      char *name;
 441 {
 442   FILE *the_stream = fopen (name, "a");
 443   if (the_stream != ((FILE *) NULL))
 444     {
 445       add_a_stream (the_stream, my_fclose);
 446       if (the_user == ((char *) NULL))
 447         file_preface = make_file_preface ();
 448       write_line_list (file_preface, the_stream);
 449       return true;
 450     }
 451   return false;
 452 }
 453
 454 void
 455 put_string (s)
 456      char *s;
 457 {
 458   register stream_list rem;
 459   for (rem = the_streams;
 460        rem != ((stream_list) NULL);
 461        rem = rem->rest_streams)
 462     fputs (s, rem->handle);
 463   return;
 464 }
 465
 466 void
 467 put_line (string)
 468      char *string;
 469 {
 470   register stream_list rem;
 471   for (rem = the_streams;
 472        rem != ((stream_list) NULL);
 473        rem = rem->rest_streams)
 474     {
 475       char *s = string;
 476       int column = 0;
 477
 478       /* Divide STRING into lines.  */
 479       while (*s != 0)
 480         {
 481           char *breakpos;
 482
 483           /* Find the last char that fits.  */
 484           for (breakpos = s; *breakpos && column < 78; ++breakpos)
 485             {
 486               if (*breakpos == '\t')
 487                 column += 8;
 488               else
 489                 column++;
 490             }
 491           /* If we didn't reach end of line, break the line.  */
 492           if (*breakpos)
 493             {
 494               /* Back up to just after the last comma that fits.  */
 495               while (breakpos != s && breakpos[-1] != ',') --breakpos;
 496
 497               if (breakpos == s)
 498                 {
 499                   /* If no comma fits, move past the first address anyway.  */
 500                   while (*breakpos != 0 && *breakpos != ',') ++breakpos;
 501                   if (*breakpos != 0)
 502                     /* Include the comma after it.  */
 503                     ++breakpos;
 504                 }
 505             }
 506           /* Output that much, then break the line.  */
 507           fwrite (s, 1, breakpos - s, rem->handle);
 508           column = 8;
 509
 510           /* Skip whitespace and prepare to print more addresses.  */
 511           s = breakpos;
 512           while (*s == ' ' || *s == '\t') ++s;
 513           if (*s != 0)
 514             fputs ("\n\t", rem->handle);
 515         }
 516       putc ('\n', rem->handle);
 517     }
 518   return;
 519 }
 520 \f
 521 #define mail_error error
 522
 523 /* Handle an FCC field.  FIELD is the text of the first line (after
 524    the header name), and THE_LIST holds the continuation lines if any.
 525    Call open_a_file for each file.  */
 526
 527 void
 528 setup_files (the_list, field)
 529      register line_list the_list;
 530      register char *field;
 531 {
 532   register char *start;
 533   register char c;
 534   while (true)
 535     {
 536       while (((c = *field) != '\0')
 537              && (c == ' '
 538                  || c == '\t'
 539                  || c == ','))
 540         field += 1;
 541       if (c != '\0')
 542         {
 543           start = field;
 544           while (((c = *field) != '\0')
 545                  && c != ' '
 546                  && c != '\t'
 547                  && c != ',')
 548             field += 1;
 549           *field = '\0';
 550           if (!open_a_file (start))
 551             mail_error ("Could not open file %s", start);
 552           *field = c;
 553           if (c != '\0') continue;
 554         }
 555       if (the_list == ((line_list) NULL))
 556         return;
 557       field = the_list->string;
 558       the_list = the_list->continuation;
 559     }
 560 }
 561 \f
 562 /* Compute the total size of all recipient names stored in THE_HEADER.
 563    The result says how big to make the buffer to pass to parse_header.  */
 564
 565 int
 566 args_size (the_header)
 567      header the_header;
 568 {
 569   register header old = the_header;
 570   register line_list rem;
 571   register int size = 0;
 572   do
 573     {
 574       char *field;
 575       register char *keyword = get_keyword (the_header->text->string, &field);
 576       if ((strcmp (keyword, "TO") == 0)
 577           || (strcmp (keyword, "CC") == 0)
 578           || (strcmp (keyword, "BCC") == 0))
 579         {
 580           size += 1 + strlen (field);
 581           for (rem = the_header->text->continuation;
 582                rem != NIL;
 583                rem = rem->continuation)
 584             size += 1 + strlen (rem->string);
 585         }
 586       the_header = the_header->next;
 587     } while (the_header != old);
 588   return size;
 589 }
 590
 591 /* Scan the header described by the lists THE_HEADER,
 592    and put all recipient names into the buffer WHERE.
 593    Precede each recipient name with a space.
 594
 595    Also, if the header has any FCC fields, call setup_files for each one.  */
 596
 597 void
 598 parse_header (the_header, where)
 599      header the_header;
 600      register char *where;
 601 {
 602   register header old = the_header;
 603   do
 604     {
 605       char *field;
 606       register char *keyword = get_keyword (the_header->text->string, &field);
 607       if (strcmp (keyword, "TO") == 0)
 608         where = add_field (the_header->text->continuation, field, where);
 609       else if (strcmp (keyword, "CC") == 0)
 610         where = add_field (the_header->text->continuation, field, where);
 611       else if (strcmp (keyword, "BCC") == 0)
 612         {
 613           where = add_field (the_header->text->continuation, field, where);
 614           the_header->previous->next = the_header->next;
 615           the_header->next->previous = the_header->previous;
 616         }
 617       else if (strcmp (keyword, "FCC") == 0)
 618         setup_files (the_header->text->continuation, field);
 619       the_header = the_header->next;
 620     } while (the_header != old);
 621   *where = '\0';
 622   return;
 623 }
 624 \f
 625 /* Read lines from the input until we get a blank line.
 626    Create a list of `header' objects, one for each header field,
 627    each of which points to a list of `line_list' objects,
 628    one for each line in that field.
 629    Continuation lines are grouped in the headers they continue.  */
 630
 631 header
 632 read_header ()
 633 {
 634   register header the_header = ((header) NULL);
 635   register line_list *next_line = ((line_list *) NULL);
 636
 637   init_linebuffer (&lb);
 638
 639   do
 640     {
 641       long length;
 642       register char *line;
 643
 644       readline (&lb, stdin);
 645       line = lb.buffer;
 646       length = strlen (line);
 647       if (length == 0) break;
 648
 649       if (has_keyword (line))
 650         {
 651           register header old = the_header;
 652           the_header = new_header ();
 653           if (old == ((header) NULL))
 654             {
 655               the_header->next = the_header;
 656               the_header->previous = the_header;
 657             }
 658           else
 659             {
 660               the_header->previous = old;
 661               the_header->next = old->next;
 662               old->next = the_header;
 663             }
 664           next_line = &(the_header->text);
 665         }
 666
 667       if (next_line == ((line_list *) NULL))
 668         {
 669           /* Not a valid header */
 670           exit (1);
 671         }
 672       *next_line = new_list ();
 673       (*next_line)->string = alloc_string (length);
 674       strcpy (((*next_line)->string), line);
 675       next_line = &((*next_line)->continuation);
 676       *next_line = NIL;
 677
 678     } while (true);
 679
 680   return the_header->next;
 681 }
 682 \f
 683 void
 684 write_header (the_header)
 685      header the_header;
 686 {
 687   register header old = the_header;
 688   do
 689     {
 690       register line_list the_list;
 691       for (the_list = the_header->text;
 692            the_list != NIL;
 693            the_list = the_list->continuation)
 694         put_line (the_list->string);
 695       the_header = the_header->next;
 696     } while (the_header != old);
 697   put_line ("");
 698   return;
 699 }
 700 \f
 701 int
 702 main (argc, argv)
 703      int argc;
 704      char **argv;
 705 {
 706   char *command_line;
 707   header the_header;
 708   long name_length;
 709   char *mail_program_name;
 710   char buf[BUFLEN + 1];
 711   register int size;
 712   FILE *the_pipe;
 713
 714   extern char *getenv ();
 715
 716   mail_program_name = getenv ("FAKEMAILER");
 717   if (!(mail_program_name && *mail_program_name))
 718     mail_program_name = MAIL_PROGRAM_NAME;
 719   name_length = strlen (mail_program_name);
 720
 721   my_name = MY_NAME;
 722   the_streams = ((stream_list) NULL);
 723   the_date = ((char *) NULL);
 724   the_user = ((char *) NULL);
 725
 726   the_header = read_header ();
 727   command_line = alloc_string (name_length + args_size (the_header));
 728   strcpy (command_line, mail_program_name);
 729   parse_header (the_header, &command_line[name_length]);
 730
 731   the_pipe = popen (command_line, "w");
 732   if (the_pipe == ((FILE *) NULL))
 733     fatal ("cannot open pipe to real mailer");
 734
 735   add_a_stream (the_pipe, pclose);
 736
 737   write_header (the_header);
 738
 739   /* Dump the message itself */
 740
 741   while (!feof (stdin))
 742     {
 743       size = fread (buf, 1, BUFLEN, stdin);
 744       buf[size] = '\0';
 745       put_string (buf);
 746     }
 747
 748   exit (close_the_streams ());
 749 }
 750
 751 #endif /* not MSDOS */
 752 #endif /* not BSD 4.2 (or newer) */