lib-src/fakemail.c

   1 /* sendmail-like interface to /bin/mail for system V,
   2    Copyright (C) 1985, 1994 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 #define NO_SHORTNAMES
  23 #include <../src/config.h>
  24
  25 #if defined (BSD_SYSTEM) && !defined (BSD4_1) && !defined (USE_FAKEMAIL)
  26 /* This program isnot used in BSD, so just avoid loader complaints.  */
  27 int
  28 main ()
  29 {
  30   return 0;
  31 }
  32 #else /* not BSD 4.2 (or newer) */
  33 #ifdef MSDOS
  34 int
  35 main ()
  36 {
  37   return 0;
  38 }
  39 #else /* not MSDOS */
  40 /* This conditional contains all the rest of the file.  */
  41
  42 /* These are defined in config in some versions. */
  43
  44 #ifdef static
  45 #undef static
  46 #endif
  47
  48 #ifdef read
  49 #undef read
  50 #undef write
  51 #undef open
  52 #undef close
  53 #endif
  54
  55 #ifdef WINDOWSNT
  56 #include "ntlib.h"
  57 #endif
  58
  59 #include <stdio.h>
  60 #include <string.h>
  61 #include <ctype.h>
  62 #include <time.h>
  63 #include <pwd.h>
  64 \f
  65 /* Type definitions */
  66
  67 #define boolean int
  68 #define true 1
  69 #define false 0
  70
  71 /* Various lists */
  72
  73 struct line_record
  74 {
  75   char *string;
  76   struct line_record *continuation;
  77 };
  78 typedef struct line_record *line_list;
  79
  80 struct header_record
  81 {
  82   line_list text;
  83   struct header_record *next;
  84   struct header_record *previous;
  85 };
  86 typedef struct header_record *header;
  87
  88 struct stream_record
  89 {
  90   FILE *handle;
  91   int (*action)();
  92   struct stream_record *rest_streams;
  93 };
  94 typedef struct stream_record *stream_list;
  95
  96 /* A `struct linebuffer' is a structure which holds a line of text.
  97  * `readline' reads a line from a stream into a linebuffer
  98  * and works regardless of the length of the line.
  99  */
 100
 101 struct linebuffer
 102 {
 103   long size;
 104   char *buffer;
 105 };
 106
 107 struct linebuffer lb;
 108
 109 #define new_list()                                      \
 110   ((line_list) xmalloc (sizeof (struct line_record)))
 111 #define new_header()                            \
 112   ((header) xmalloc (sizeof (struct header_record)))
 113 #define new_stream()                            \
 114   ((stream_list) xmalloc (sizeof (struct stream_record)))
 115 #define alloc_string(nchars)                            \
 116   ((char *) xmalloc ((nchars) + 1))
 117 \f
 118 /* Global declarations */
 119
 120 #define BUFLEN 1024
 121 #define KEYWORD_SIZE 256
 122 #define FROM_PREFIX "From"
 123 #define MY_NAME "fakemail"
 124 #define NIL ((line_list) NULL)
 125 #define INITIAL_LINE_SIZE 200
 126
 127 #ifndef MAIL_PROGRAM_NAME
 128 #define MAIL_PROGRAM_NAME "/bin/mail"
 129 #endif
 130
 131 static char *my_name;
 132 static char *the_date;
 133 static char *the_user;
 134 static line_list file_preface;
 135 static stream_list the_streams;
 136 static boolean no_problems = true;
 137
 138 extern FILE *popen ();
 139 extern int fclose (), pclose ();
 140
 141 #ifdef CURRENT_USER
 142 extern struct passwd *getpwuid ();
 143 extern unsigned short geteuid ();
 144 static struct passwd *my_entry;
 145 #define cuserid(s)                              \
 146 (my_entry = getpwuid (((int) geteuid ())),      \
 147  my_entry->pw_name)
 148 #endif
 149 \f
 150 /* Utilities */
 151
 152 /* Print error message.  `s1' is printf control string, `s2' is arg for it. */
 153
 154 static void
 155 error (s1, s2)
 156      char *s1, *s2;
 157 {
 158   printf ("%s: ", my_name);
 159   printf (s1, s2);
 160   printf ("\n");
 161   no_problems = false;
 162 }
 163
 164 /* Print error message and exit.  */
 165
 166 static void
 167 fatal (s1, s2)
 168      char *s1, *s2;
 169 {
 170   error (s1, s2);
 171   exit (1);
 172 }
 173
 174 /* Like malloc but get fatal error if memory is exhausted.  */
 175
 176 static long *
 177 xmalloc (size)
 178      int size;
 179 {
 180   long *result = (long *) malloc (((unsigned) size));
 181   if (result == ((long *) NULL))
 182     fatal ("virtual memory exhausted", 0);
 183   return result;
 184 }
 185
 186 static long *
 187 xrealloc (ptr, size)
 188      long *ptr;
 189      int size;
 190 {
 191   long *result = (long *) realloc (ptr, ((unsigned) size));
 192   if (result == ((long *) NULL))
 193     fatal ("virtual memory exhausted");
 194   return result;
 195 }
 196 \f
 197 /* Initialize a linebuffer for use */
 198
 199 void
 200 init_linebuffer (linebuffer)
 201      struct linebuffer *linebuffer;
 202 {
 203   linebuffer->size = INITIAL_LINE_SIZE;
 204   linebuffer->buffer = ((char *) xmalloc (INITIAL_LINE_SIZE));
 205 }
 206
 207 /* Read a line of text from `stream' into `linebuffer'.
 208  * Return the length of the line.
 209  */
 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 (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 char c;
 256
 257   ptr = &keyword[0];
 258   c = *field++;
 259   if (isspace (c) || c == ':')
 260     return ((char *) NULL);
 261   *ptr++ = (islower (c) ? toupper (c) : c);
 262   while (((c = *field++) != ':') && ! isspace (c))
 263     *ptr++ = (islower (c) ? toupper (c) : c);
 264   *ptr++ = '\0';
 265   while (isspace (c))
 266     c = *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 parse_header (the_header, where)
 598      header the_header;
 599      register char *where;
 600 {
 601   register header old = the_header;
 602   do
 603     {
 604       char *field;
 605       register char *keyword = get_keyword (the_header->text->string, &field);
 606       if (strcmp (keyword, "TO") == 0)
 607         where = add_field (the_header->text->continuation, field, where);
 608       else if (strcmp (keyword, "CC") == 0)
 609         where = add_field (the_header->text->continuation, field, where);
 610       else if (strcmp (keyword, "BCC") == 0)
 611         {
 612           where = add_field (the_header->text->continuation, field, where);
 613           the_header->previous->next = the_header->next;
 614           the_header->next->previous = the_header->previous;
 615         }
 616       else if (strcmp (keyword, "FCC") == 0)
 617         setup_files (the_header->text->continuation, field);
 618       the_header = the_header->next;
 619     } while (the_header != old);
 620   *where = '\0';
 621   return;
 622 }
 623 \f
 624 /* Read lines from the input until we get a blank line.
 625    Create a list of `header' objects, one for each header field,
 626    each of which points to a list of `line_list' objects,
 627    one for each line in that field.
 628    Continuation lines are grouped in the headers they continue.  */
 629
 630 header
 631 read_header ()
 632 {
 633   register header the_header = ((header) NULL);
 634   register line_list *next_line = ((line_list *) NULL);
 635
 636   init_linebuffer (&lb);
 637
 638   do
 639     {
 640       long length;
 641       register char *line;
 642
 643       readline (&lb, stdin);
 644       line = lb.buffer;
 645       length = strlen (line);
 646       if (length == 0) break;
 647
 648       if (has_keyword (line))
 649         {
 650           register header old = the_header;
 651           the_header = new_header ();
 652           if (old == ((header) NULL))
 653             {
 654               the_header->next = the_header;
 655               the_header->previous = the_header;
 656             }
 657           else
 658             {
 659               the_header->previous = old;
 660               the_header->next = old->next;
 661               old->next = the_header;
 662             }
 663           next_line = &(the_header->text);
 664         }
 665
 666       if (next_line == ((line_list *) NULL))
 667         {
 668           /* Not a valid header */
 669           exit (1);
 670         }
 671       *next_line = new_list ();
 672       (*next_line)->string = alloc_string (length);
 673       strcpy (((*next_line)->string), line);
 674       next_line = &((*next_line)->continuation);
 675       *next_line = NIL;
 676
 677     } while (true);
 678
 679   return the_header->next;
 680 }
 681 \f
 682 void
 683 write_header (the_header)
 684      header the_header;
 685 {
 686   register header old = the_header;
 687   do
 688     {
 689       register line_list the_list;
 690       for (the_list = the_header->text;
 691            the_list != NIL;
 692            the_list = the_list->continuation)
 693         put_line (the_list->string);
 694       the_header = the_header->next;
 695     } while (the_header != old);
 696   put_line ("");
 697   return;
 698 }
 699 \f
 700 int
 701 main (argc, argv)
 702      int argc;
 703      char **argv;
 704 {
 705   char *command_line;
 706   header the_header;
 707   long name_length;
 708   char *mail_program_name;
 709   char buf[BUFLEN + 1];
 710   register int size;
 711   FILE *the_pipe;
 712
 713   extern char *getenv ();
 714
 715   mail_program_name = getenv ("FAKEMAILER");
 716   if (!(mail_program_name && *mail_program_name))
 717     mail_program_name = MAIL_PROGRAM_NAME;
 718   name_length = strlen (mail_program_name);
 719
 720   my_name = MY_NAME;
 721   the_streams = ((stream_list) NULL);
 722   the_date = ((char *) NULL);
 723   the_user = ((char *) NULL);
 724
 725   the_header = read_header ();
 726   command_line = alloc_string (name_length + args_size (the_header));
 727   strcpy (command_line, mail_program_name);
 728   parse_header (the_header, &command_line[name_length]);
 729
 730   the_pipe = popen (command_line, "w");
 731   if (the_pipe == ((FILE *) NULL))
 732     fatal ("cannot open pipe to real mailer");
 733
 734   add_a_stream (the_pipe, pclose);
 735
 736   write_header (the_header);
 737
 738   /* Dump the message itself */
 739
 740   while (!feof (stdin))
 741     {
 742       size = fread (buf, 1, BUFLEN, stdin);
 743       buf[size] = '\0';
 744       put_string (buf);
 745     }
 746
 747   exit (close_the_streams ());
 748 }
 749
 750 #endif /* not MSDOS */
 751 #endif /* not BSD 4.2 (or newer) */