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
  65 /* This is to declare cuserid.  */
  66 #ifdef HAVE_UNISTD_H
  67 #include <unistd.h>
  68 #endif
  69 \f
  70 /* Type definitions */
  71
  72 #define boolean int
  73 #define true 1
  74 #define false 0
  75
  76 /* Various lists */
  77
  78 struct line_record
  79 {
  80   char *string;
  81   struct line_record *continuation;
  82 };
  83 typedef struct line_record *line_list;
  84
  85 struct header_record
  86 {
  87   line_list text;
  88   struct header_record *next;
  89   struct header_record *previous;
  90 };
  91 typedef struct header_record *header;
  92
  93 struct stream_record
  94 {
  95   FILE *handle;
  96   int (*action)();
  97   struct stream_record *rest_streams;
  98 };
  99 typedef struct stream_record *stream_list;
 100
 101 /* A `struct linebuffer' is a structure which holds a line of text.
 102  * `readline' reads a line from a stream into a linebuffer
 103  * and works regardless of the length of the line.
 104  */
 105
 106 struct linebuffer
 107 {
 108   long size;
 109   char *buffer;
 110 };
 111
 112 struct linebuffer lb;
 113
 114 #define new_list()                                      \
 115   ((line_list) xmalloc (sizeof (struct line_record)))
 116 #define new_header()                            \
 117   ((header) xmalloc (sizeof (struct header_record)))
 118 #define new_stream()                            \
 119   ((stream_list) xmalloc (sizeof (struct stream_record)))
 120 #define alloc_string(nchars)                            \
 121   ((char *) xmalloc ((nchars) + 1))
 122 \f
 123 /* Global declarations */
 124
 125 #define BUFLEN 1024
 126 #define KEYWORD_SIZE 256
 127 #define FROM_PREFIX "From"
 128 #define MY_NAME "fakemail"
 129 #define NIL ((line_list) NULL)
 130 #define INITIAL_LINE_SIZE 200
 131
 132 #ifndef MAIL_PROGRAM_NAME
 133 #define MAIL_PROGRAM_NAME "/bin/mail"
 134 #endif
 135
 136 static char *my_name;
 137 static char *the_date;
 138 static char *the_user;
 139 static line_list file_preface;
 140 static stream_list the_streams;
 141 static boolean no_problems = true;
 142
 143 extern FILE *popen ();
 144 extern int fclose (), pclose ();
 145
 146 #ifdef CURRENT_USER
 147 extern struct passwd *getpwuid ();
 148 extern unsigned short geteuid ();
 149 static struct passwd *my_entry;
 150 #define cuserid(s)                              \
 151 (my_entry = getpwuid (((int) geteuid ())),      \
 152  my_entry->pw_name)
 153 #endif
 154 \f
 155 /* Utilities */
 156
 157 /* Print error message.  `s1' is printf control string, `s2' is arg for it. */
 158
 159 static void
 160 error (s1, s2)
 161      char *s1, *s2;
 162 {
 163   printf ("%s: ", my_name);
 164   printf (s1, s2);
 165   printf ("\n");
 166   no_problems = false;
 167 }
 168
 169 /* Print error message and exit.  */
 170
 171 static void
 172 fatal (s1, s2)
 173      char *s1, *s2;
 174 {
 175   error (s1, s2);
 176   exit (1);
 177 }
 178
 179 /* Like malloc but get fatal error if memory is exhausted.  */
 180
 181 static long *
 182 xmalloc (size)
 183      int size;
 184 {
 185   long *result = (long *) malloc (((unsigned) size));
 186   if (result == ((long *) NULL))
 187     fatal ("virtual memory exhausted", 0);
 188   return result;
 189 }
 190
 191 static long *
 192 xrealloc (ptr, size)
 193      long *ptr;
 194      int size;
 195 {
 196   long *result = (long *) realloc (ptr, ((unsigned) size));
 197   if (result == ((long *) NULL))
 198     fatal ("virtual memory exhausted");
 199   return result;
 200 }
 201 \f
 202 /* Initialize a linebuffer for use */
 203
 204 void
 205 init_linebuffer (linebuffer)
 206      struct linebuffer *linebuffer;
 207 {
 208   linebuffer->size = INITIAL_LINE_SIZE;
 209   linebuffer->buffer = ((char *) xmalloc (INITIAL_LINE_SIZE));
 210 }
 211
 212 /* Read a line of text from `stream' into `linebuffer'.
 213  * Return the length of the line.
 214  */
 215
 216 long
 217 readline (linebuffer, stream)
 218      struct linebuffer *linebuffer;
 219      FILE *stream;
 220 {
 221   char *buffer = linebuffer->buffer;
 222   char *p = linebuffer->buffer;
 223   char *end = p + linebuffer->size;
 224
 225   while (true)
 226     {
 227       int c = getc (stream);
 228       if (p == end)
 229         {
 230           linebuffer->size *= 2;
 231           buffer = ((char *) xrealloc (buffer, linebuffer->size));
 232           p = buffer + (p - linebuffer->buffer);
 233           end = buffer + linebuffer->size;
 234           linebuffer->buffer = buffer;
 235         }
 236       if (c < 0 || c == '\n')
 237         {
 238           *p = 0;
 239           break;
 240         }
 241       *p++ = c;
 242     }
 243
 244   return p - buffer;
 245 }
 246 \f
 247 /* Extract a colon-terminated keyword from the string FIELD.
 248    Return that keyword as a string stored in a static buffer.
 249    Store the address of the rest of the string into *REST.
 250
 251    If there is no keyword, return NULL and don't alter *REST.  */
 252
 253 char *
 254 get_keyword (field, rest)
 255      register char *field;
 256      char **rest;
 257 {
 258   static char keyword[KEYWORD_SIZE];
 259   register char *ptr;
 260   register char c;
 261
 262   ptr = &keyword[0];
 263   c = *field++;
 264   if (isspace (c) || c == ':')
 265     return ((char *) NULL);
 266   *ptr++ = (islower (c) ? toupper (c) : c);
 267   while (((c = *field++) != ':') && ! isspace (c))
 268     *ptr++ = (islower (c) ? toupper (c) : c);
 269   *ptr++ = '\0';
 270   while (isspace (c))
 271     c = *field++;
 272   if (c != ':')
 273     return ((char *) NULL);
 274   *rest = field;
 275   return &keyword[0];
 276 }
 277
 278 /* Nonzero if the string FIELD starts with a colon-terminated keyword.  */
 279
 280 boolean
 281 has_keyword (field)
 282      char *field;
 283 {
 284   char *ignored;
 285   return (get_keyword (field, &ignored) != ((char *) NULL));
 286 }
 287
 288 /* Store the string FIELD, followed by any lines in THE_LIST,
 289    into the buffer WHERE.
 290    Concatenate lines, putting just a space between them.
 291    Delete everything contained in parentheses.
 292    When a recipient name contains <...>, we discard
 293    everything except what is inside the <...>.
 294
 295    We don't pay attention to overflowing WHERE;
 296    the caller has to make it big enough.  */
 297
 298 char *
 299 add_field (the_list, field, where)
 300      line_list the_list;
 301      register char *field, *where;
 302 {
 303   register char c;
 304   while (true)
 305     {
 306       char *this_recipient_where;
 307       int in_quotes = 0;
 308
 309       *where++ = ' ';
 310       this_recipient_where = where;
 311
 312       while ((c = *field++) != '\0')
 313         {
 314           if (c == '\\')
 315             *where++ = c;
 316           else if (c == '"')
 317             {
 318               in_quotes = ! in_quotes;
 319               *where++ = c;
 320             }
 321           else if (in_quotes)
 322             *where++ = c;
 323           else if (c == '(')
 324             {
 325               while (*field && *field != ')') ++field;
 326               if (! (*field++)) break; /* no close */
 327               continue;
 328             }
 329           else if (c == ',')
 330             {
 331               *where++ = ' ';
 332               /* When we get to the end of one recipient,
 333                  don't discard it if the next one has <...>.  */
 334               this_recipient_where = where;
 335             }
 336           else if (c == '<')
 337             /* Discard everything we got before the `<'.  */
 338             where = this_recipient_where;
 339           else if (c == '>')
 340             /* Discard the rest of this name that follows the `>'.  */
 341             {
 342               while (*field && *field != ',') ++field;
 343               if (! (*field++)) break; /* no comma */
 344               continue;
 345             }
 346           else
 347             *where++ = c;
 348         }
 349       if (the_list == NIL) break;
 350       field = the_list->string;
 351       the_list = the_list->continuation;
 352     }
 353   return where;
 354 }
 355 \f
 356 line_list
 357 make_file_preface ()
 358 {
 359   char *the_string, *temp;
 360   long idiotic_interface;
 361   long prefix_length;
 362   long user_length;
 363   long date_length;
 364   line_list result;
 365
 366   prefix_length = strlen (FROM_PREFIX);
 367   time (&idiotic_interface);
 368   the_date = ctime (&idiotic_interface);
 369   /* the_date has an unwanted newline at the end */
 370   date_length = strlen (the_date) - 1;
 371   the_date[date_length] = '\0';
 372   temp = cuserid ((char *) NULL);
 373   user_length = strlen (temp);
 374   the_user = alloc_string (user_length + 1);
 375   strcpy (the_user, temp);
 376   the_string = alloc_string (3 + prefix_length
 377                              + user_length
 378                              + date_length);
 379   temp = the_string;
 380   strcpy (temp, FROM_PREFIX);
 381   temp = &temp[prefix_length];
 382   *temp++ = ' ';
 383   strcpy (temp, the_user);
 384   temp = &temp[user_length];
 385   *temp++ = ' ';
 386   strcpy (temp, the_date);
 387   result = new_list ();
 388   result->string = the_string;
 389   result->continuation = ((line_list) NULL);
 390   return result;
 391 }
 392
 393 void
 394 write_line_list (the_list, the_stream)
 395      register line_list the_list;
 396      FILE *the_stream;
 397 {
 398   for ( ;
 399       the_list != ((line_list) NULL) ;
 400       the_list = the_list->continuation)
 401     {
 402       fputs (the_list->string, the_stream);
 403       putc ('\n', the_stream);
 404     }
 405   return;
 406 }
 407 \f
 408 int
 409 close_the_streams ()
 410 {
 411   register stream_list rem;
 412   for (rem = the_streams;
 413        rem != ((stream_list) NULL);
 414        rem = rem->rest_streams)
 415     no_problems = (no_problems &&
 416                    ((*rem->action) (rem->handle) == 0));
 417   the_streams = ((stream_list) NULL);
 418   return (no_problems ? 0 : 1);
 419 }
 420
 421 void
 422 add_a_stream (the_stream, closing_action)
 423      FILE *the_stream;
 424      int (*closing_action)();
 425 {
 426   stream_list old = the_streams;
 427   the_streams = new_stream ();
 428   the_streams->handle = the_stream;
 429   the_streams->action = closing_action;
 430   the_streams->rest_streams = old;
 431   return;
 432 }
 433
 434 int
 435 my_fclose (the_file)
 436      FILE *the_file;
 437 {
 438   putc ('\n', the_file);
 439   fflush (the_file);
 440   return fclose (the_file);
 441 }
 442
 443 boolean
 444 open_a_file (name)
 445      char *name;
 446 {
 447   FILE *the_stream = fopen (name, "a");
 448   if (the_stream != ((FILE *) NULL))
 449     {
 450       add_a_stream (the_stream, my_fclose);
 451       if (the_user == ((char *) NULL))
 452         file_preface = make_file_preface ();
 453       write_line_list (file_preface, the_stream);
 454       return true;
 455     }
 456   return false;
 457 }
 458
 459 void
 460 put_string (s)
 461      char *s;
 462 {
 463   register stream_list rem;
 464   for (rem = the_streams;
 465        rem != ((stream_list) NULL);
 466        rem = rem->rest_streams)
 467     fputs (s, rem->handle);
 468   return;
 469 }
 470
 471 void
 472 put_line (string)
 473      char *string;
 474 {
 475   register stream_list rem;
 476   for (rem = the_streams;
 477        rem != ((stream_list) NULL);
 478        rem = rem->rest_streams)
 479     {
 480       char *s = string;
 481       int column = 0;
 482
 483       /* Divide STRING into lines.  */
 484       while (*s != 0)
 485         {
 486           char *breakpos;
 487
 488           /* Find the last char that fits.  */
 489           for (breakpos = s; *breakpos && column < 78; ++breakpos)
 490             {
 491               if (*breakpos == '\t')
 492                 column += 8;
 493               else
 494                 column++;
 495             }
 496           /* If we didn't reach end of line, break the line.  */
 497           if (*breakpos)
 498             {
 499               /* Back up to just after the last comma that fits.  */
 500               while (breakpos != s && breakpos[-1] != ',') --breakpos;
 501
 502               if (breakpos == s)
 503                 {
 504                   /* If no comma fits, move past the first address anyway.  */
 505                   while (*breakpos != 0 && *breakpos != ',') ++breakpos;
 506                   if (*breakpos != 0)
 507                     /* Include the comma after it.  */
 508                     ++breakpos;
 509                 }
 510             }
 511           /* Output that much, then break the line.  */
 512           fwrite (s, 1, breakpos - s, rem->handle);
 513           column = 8;
 514
 515           /* Skip whitespace and prepare to print more addresses.  */
 516           s = breakpos;
 517           while (*s == ' ' || *s == '\t') ++s;
 518           if (*s != 0)
 519             fputs ("\n\t", rem->handle);
 520         }
 521       putc ('\n', rem->handle);
 522     }
 523   return;
 524 }
 525 \f
 526 #define mail_error error
 527
 528 /* Handle an FCC field.  FIELD is the text of the first line (after
 529    the header name), and THE_LIST holds the continuation lines if any.
 530    Call open_a_file for each file.  */
 531
 532 void
 533 setup_files (the_list, field)
 534      register line_list the_list;
 535      register char *field;
 536 {
 537   register char *start;
 538   register char c;
 539   while (true)
 540     {
 541       while (((c = *field) != '\0')
 542              && (c == ' '
 543                  || c == '\t'
 544                  || c == ','))
 545         field += 1;
 546       if (c != '\0')
 547         {
 548           start = field;
 549           while (((c = *field) != '\0')
 550                  && c != ' '
 551                  && c != '\t'
 552                  && c != ',')
 553             field += 1;
 554           *field = '\0';
 555           if (!open_a_file (start))
 556             mail_error ("Could not open file %s", start);
 557           *field = c;
 558           if (c != '\0') continue;
 559         }
 560       if (the_list == ((line_list) NULL))
 561         return;
 562       field = the_list->string;
 563       the_list = the_list->continuation;
 564     }
 565 }
 566 \f
 567 /* Compute the total size of all recipient names stored in THE_HEADER.
 568    The result says how big to make the buffer to pass to parse_header.  */
 569
 570 int
 571 args_size (the_header)
 572      header the_header;
 573 {
 574   register header old = the_header;
 575   register line_list rem;
 576   register int size = 0;
 577   do
 578     {
 579       char *field;
 580       register char *keyword = get_keyword (the_header->text->string, &field);
 581       if ((strcmp (keyword, "TO") == 0)
 582           || (strcmp (keyword, "CC") == 0)
 583           || (strcmp (keyword, "BCC") == 0))
 584         {
 585           size += 1 + strlen (field);
 586           for (rem = the_header->text->continuation;
 587                rem != NIL;
 588                rem = rem->continuation)
 589             size += 1 + strlen (rem->string);
 590         }
 591       the_header = the_header->next;
 592     } while (the_header != old);
 593   return size;
 594 }
 595
 596 /* Scan the header described by the lists THE_HEADER,
 597    and put all recipient names into the buffer WHERE.
 598    Precede each recipient name with a space.
 599
 600    Also, if the header has any FCC fields, call setup_files for each one.  */
 601
 602 parse_header (the_header, where)
 603      header the_header;
 604      register char *where;
 605 {
 606   register header old = the_header;
 607   do
 608     {
 609       char *field;
 610       register char *keyword = get_keyword (the_header->text->string, &field);
 611       if (strcmp (keyword, "TO") == 0)
 612         where = add_field (the_header->text->continuation, field, where);
 613       else if (strcmp (keyword, "CC") == 0)
 614         where = add_field (the_header->text->continuation, field, where);
 615       else if (strcmp (keyword, "BCC") == 0)
 616         {
 617           where = add_field (the_header->text->continuation, field, where);
 618           the_header->previous->next = the_header->next;
 619           the_header->next->previous = the_header->previous;
 620         }
 621       else if (strcmp (keyword, "FCC") == 0)
 622         setup_files (the_header->text->continuation, field);
 623       the_header = the_header->next;
 624     } while (the_header != old);
 625   *where = '\0';
 626   return;
 627 }
 628 \f
 629 /* Read lines from the input until we get a blank line.
 630    Create a list of `header' objects, one for each header field,
 631    each of which points to a list of `line_list' objects,
 632    one for each line in that field.
 633    Continuation lines are grouped in the headers they continue.  */
 634
 635 header
 636 read_header ()
 637 {
 638   register header the_header = ((header) NULL);
 639   register line_list *next_line = ((line_list *) NULL);
 640
 641   init_linebuffer (&lb);
 642
 643   do
 644     {
 645       long length;
 646       register char *line;
 647
 648       readline (&lb, stdin);
 649       line = lb.buffer;
 650       length = strlen (line);
 651       if (length == 0) break;
 652
 653       if (has_keyword (line))
 654         {
 655           register header old = the_header;
 656           the_header = new_header ();
 657           if (old == ((header) NULL))
 658             {
 659               the_header->next = the_header;
 660               the_header->previous = the_header;
 661             }
 662           else
 663             {
 664               the_header->previous = old;
 665               the_header->next = old->next;
 666               old->next = the_header;
 667             }
 668           next_line = &(the_header->text);
 669         }
 670
 671       if (next_line == ((line_list *) NULL))
 672         {
 673           /* Not a valid header */
 674           exit (1);
 675         }
 676       *next_line = new_list ();
 677       (*next_line)->string = alloc_string (length);
 678       strcpy (((*next_line)->string), line);
 679       next_line = &((*next_line)->continuation);
 680       *next_line = NIL;
 681
 682     } while (true);
 683
 684   return the_header->next;
 685 }
 686 \f
 687 void
 688 write_header (the_header)
 689      header the_header;
 690 {
 691   register header old = the_header;
 692   do
 693     {
 694       register line_list the_list;
 695       for (the_list = the_header->text;
 696            the_list != NIL;
 697            the_list = the_list->continuation)
 698         put_line (the_list->string);
 699       the_header = the_header->next;
 700     } while (the_header != old);
 701   put_line ("");
 702   return;
 703 }
 704 \f
 705 int
 706 main (argc, argv)
 707      int argc;
 708      char **argv;
 709 {
 710   char *command_line;
 711   header the_header;
 712   long name_length;
 713   char *mail_program_name;
 714   char buf[BUFLEN + 1];
 715   register int size;
 716   FILE *the_pipe;
 717
 718   extern char *getenv ();
 719
 720   mail_program_name = getenv ("FAKEMAILER");
 721   if (!(mail_program_name && *mail_program_name))
 722     mail_program_name = MAIL_PROGRAM_NAME;
 723   name_length = strlen (mail_program_name);
 724
 725   my_name = MY_NAME;
 726   the_streams = ((stream_list) NULL);
 727   the_date = ((char *) NULL);
 728   the_user = ((char *) NULL);
 729
 730   the_header = read_header ();
 731   command_line = alloc_string (name_length + args_size (the_header));
 732   strcpy (command_line, mail_program_name);
 733   parse_header (the_header, &command_line[name_length]);
 734
 735   the_pipe = popen (command_line, "w");
 736   if (the_pipe == ((FILE *) NULL))
 737     fatal ("cannot open pipe to real mailer");
 738
 739   add_a_stream (the_pipe, pclose);
 740
 741   write_header (the_header);
 742
 743   /* Dump the message itself */
 744
 745   while (!feof (stdin))
 746     {
 747       size = fread (buf, 1, BUFLEN, stdin);
 748       buf[size] = '\0';
 749       put_string (buf);
 750     }
 751
 752   exit (close_the_streams ());
 753 }
 754
 755 #endif /* not MSDOS */
 756 #endif /* not BSD 4.2 (or newer) */