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 /* 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 read
  52 #undef read
  53 #undef write
  54 #undef open
  55 #undef close
  56 #endif
  57
  58 #ifdef WINDOWSNT
  59 #include "ntlib.h"
  60 #endif
  61
  62 #include <stdio.h>
  63 #include <string.h>
  64 #include <ctype.h>
  65 #include <time.h>
  66 #include <pwd.h>
  67
  68 /* This is to declare cuserid.  */
  69 #ifdef HAVE_UNISTD_H
  70 #include <unistd.h>
  71 #endif
  72 \f
  73 /* Type definitions */
  74
  75 #define boolean int
  76 #define true 1
  77 #define false 0
  78
  79 /* Various lists */
  80
  81 struct line_record
  82 {
  83   char *string;
  84   struct line_record *continuation;
  85 };
  86 typedef struct line_record *line_list;
  87
  88 struct header_record
  89 {
  90   line_list text;
  91   struct header_record *next;
  92   struct header_record *previous;
  93 };
  94 typedef struct header_record *header;
  95
  96 struct stream_record
  97 {
  98   FILE *handle;
  99   int (*action)();
 100   struct stream_record *rest_streams;
 101 };
 102 typedef struct stream_record *stream_list;
 103
 104 /* A `struct linebuffer' is a structure which holds a line of text.
 105  * `readline' reads a line from a stream into a linebuffer
 106  * and works regardless of the length of the line.
 107  */
 108
 109 struct linebuffer
 110 {
 111   long size;
 112   char *buffer;
 113 };
 114
 115 struct linebuffer lb;
 116
 117 #define new_list()                                      \
 118   ((line_list) xmalloc (sizeof (struct line_record)))
 119 #define new_header()                            \
 120   ((header) xmalloc (sizeof (struct header_record)))
 121 #define new_stream()                            \
 122   ((stream_list) xmalloc (sizeof (struct stream_record)))
 123 #define alloc_string(nchars)                            \
 124   ((char *) xmalloc ((nchars) + 1))
 125 \f
 126 /* Global declarations */
 127
 128 #define BUFLEN 1024
 129 #define KEYWORD_SIZE 256
 130 #define FROM_PREFIX "From"
 131 #define MY_NAME "fakemail"
 132 #define NIL ((line_list) NULL)
 133 #define INITIAL_LINE_SIZE 200
 134
 135 #ifndef MAIL_PROGRAM_NAME
 136 #define MAIL_PROGRAM_NAME "/bin/mail"
 137 #endif
 138
 139 static char *my_name;
 140 static char *the_date;
 141 static char *the_user;
 142 static line_list file_preface;
 143 static stream_list the_streams;
 144 static boolean no_problems = true;
 145
 146 extern FILE *popen ();
 147 extern int fclose (), pclose ();
 148
 149 #ifdef CURRENT_USER
 150 extern struct passwd *getpwuid ();
 151 extern unsigned short geteuid ();
 152 static struct passwd *my_entry;
 153 #define cuserid(s)                              \
 154 (my_entry = getpwuid (((int) geteuid ())),      \
 155  my_entry->pw_name)
 156 #endif
 157 \f
 158 /* Utilities */
 159
 160 /* Print error message.  `s1' is printf control string, `s2' is arg for it. */
 161
 162 static void
 163 error (s1, s2)
 164      char *s1, *s2;
 165 {
 166   printf ("%s: ", my_name);
 167   printf (s1, s2);
 168   printf ("\n");
 169   no_problems = false;
 170 }
 171
 172 /* Print error message and exit.  */
 173
 174 static void
 175 fatal (s1, s2)
 176      char *s1, *s2;
 177 {
 178   error (s1, s2);
 179   exit (1);
 180 }
 181
 182 /* Like malloc but get fatal error if memory is exhausted.  */
 183
 184 static long *
 185 xmalloc (size)
 186      int size;
 187 {
 188   long *result = (long *) malloc (((unsigned) size));
 189   if (result == ((long *) NULL))
 190     fatal ("virtual memory exhausted", 0);
 191   return result;
 192 }
 193
 194 static long *
 195 xrealloc (ptr, size)
 196      long *ptr;
 197      int size;
 198 {
 199   long *result = (long *) realloc (ptr, ((unsigned) size));
 200   if (result == ((long *) NULL))
 201     fatal ("virtual memory exhausted");
 202   return result;
 203 }
 204 \f
 205 /* Initialize a linebuffer for use */
 206
 207 void
 208 init_linebuffer (linebuffer)
 209      struct linebuffer *linebuffer;
 210 {
 211   linebuffer->size = INITIAL_LINE_SIZE;
 212   linebuffer->buffer = ((char *) xmalloc (INITIAL_LINE_SIZE));
 213 }
 214
 215 /* Read a line of text from `stream' into `linebuffer'.
 216  * Return the length of the line.
 217  */
 218
 219 long
 220 readline (linebuffer, stream)
 221      struct linebuffer *linebuffer;
 222      FILE *stream;
 223 {
 224   char *buffer = linebuffer->buffer;
 225   char *p = linebuffer->buffer;
 226   char *end = p + linebuffer->size;
 227
 228   while (true)
 229     {
 230       int c = getc (stream);
 231       if (p == end)
 232         {
 233           linebuffer->size *= 2;
 234           buffer = ((char *) xrealloc (buffer, linebuffer->size));
 235           p = buffer + (p - linebuffer->buffer);
 236           end = buffer + linebuffer->size;
 237           linebuffer->buffer = buffer;
 238         }
 239       if (c < 0 || c == '\n')
 240         {
 241           *p = 0;
 242           break;
 243         }
 244       *p++ = c;
 245     }
 246
 247   return p - buffer;
 248 }
 249 \f
 250 /* Extract a colon-terminated keyword from the string FIELD.
 251    Return that keyword as a string stored in a static buffer.
 252    Store the address of the rest of the string into *REST.
 253
 254    If there is no keyword, return NULL and don't alter *REST.  */
 255
 256 char *
 257 get_keyword (field, rest)
 258      register char *field;
 259      char **rest;
 260 {
 261   static char keyword[KEYWORD_SIZE];
 262   register char *ptr;
 263   register char c;
 264
 265   ptr = &keyword[0];
 266   c = *field++;
 267   if (isspace (c) || c == ':')
 268     return ((char *) NULL);
 269   *ptr++ = (islower (c) ? toupper (c) : c);
 270   while (((c = *field++) != ':') && ! isspace (c))
 271     *ptr++ = (islower (c) ? toupper (c) : c);
 272   *ptr++ = '\0';
 273   while (isspace (c))
 274     c = *field++;
 275   if (c != ':')
 276     return ((char *) NULL);
 277   *rest = field;
 278   return &keyword[0];
 279 }
 280
 281 /* Nonzero if the string FIELD starts with a colon-terminated keyword.  */
 282
 283 boolean
 284 has_keyword (field)
 285      char *field;
 286 {
 287   char *ignored;
 288   return (get_keyword (field, &ignored) != ((char *) NULL));
 289 }
 290
 291 /* Store the string FIELD, followed by any lines in THE_LIST,
 292    into the buffer WHERE.
 293    Concatenate lines, putting just a space between them.
 294    Delete everything contained in parentheses.
 295    When a recipient name contains <...>, we discard
 296    everything except what is inside the <...>.
 297
 298    We don't pay attention to overflowing WHERE;
 299    the caller has to make it big enough.  */
 300
 301 char *
 302 add_field (the_list, field, where)
 303      line_list the_list;
 304      register char *field, *where;
 305 {
 306   register char c;
 307   while (true)
 308     {
 309       char *this_recipient_where;
 310       int in_quotes = 0;
 311
 312       *where++ = ' ';
 313       this_recipient_where = where;
 314
 315       while ((c = *field++) != '\0')
 316         {
 317           if (c == '\\')
 318             *where++ = c;
 319           else if (c == '"')
 320             {
 321               in_quotes = ! in_quotes;
 322               *where++ = c;
 323             }
 324           else if (in_quotes)
 325             *where++ = c;
 326           else if (c == '(')
 327             {
 328               while (*field && *field != ')') ++field;
 329               if (! (*field++)) break; /* no close */
 330               continue;
 331             }
 332           else if (c == ',')
 333             {
 334               *where++ = ' ';
 335               /* When we get to the end of one recipient,
 336                  don't discard it if the next one has <...>.  */
 337               this_recipient_where = where;
 338             }
 339           else if (c == '<')
 340             /* Discard everything we got before the `<'.  */
 341             where = this_recipient_where;
 342           else if (c == '>')
 343             /* Discard the rest of this name that follows the `>'.  */
 344             {
 345               while (*field && *field != ',') ++field;
 346               if (! (*field++)) break; /* no comma */
 347               continue;
 348             }
 349           else
 350             *where++ = c;
 351         }
 352       if (the_list == NIL) break;
 353       field = the_list->string;
 354       the_list = the_list->continuation;
 355     }
 356   return where;
 357 }
 358 \f
 359 line_list
 360 make_file_preface ()
 361 {
 362   char *the_string, *temp;
 363   long idiotic_interface;
 364   long prefix_length;
 365   long user_length;
 366   long date_length;
 367   line_list result;
 368
 369   prefix_length = strlen (FROM_PREFIX);
 370   time (&idiotic_interface);
 371   the_date = ctime (&idiotic_interface);
 372   /* the_date has an unwanted newline at the end */
 373   date_length = strlen (the_date) - 1;
 374   the_date[date_length] = '\0';
 375   temp = cuserid ((char *) NULL);
 376   user_length = strlen (temp);
 377   the_user = alloc_string (user_length + 1);
 378   strcpy (the_user, temp);
 379   the_string = alloc_string (3 + prefix_length
 380                              + user_length
 381                              + date_length);
 382   temp = the_string;
 383   strcpy (temp, FROM_PREFIX);
 384   temp = &temp[prefix_length];
 385   *temp++ = ' ';
 386   strcpy (temp, the_user);
 387   temp = &temp[user_length];
 388   *temp++ = ' ';
 389   strcpy (temp, the_date);
 390   result = new_list ();
 391   result->string = the_string;
 392   result->continuation = ((line_list) NULL);
 393   return result;
 394 }
 395
 396 void
 397 write_line_list (the_list, the_stream)
 398      register line_list the_list;
 399      FILE *the_stream;
 400 {
 401   for ( ;
 402       the_list != ((line_list) NULL) ;
 403       the_list = the_list->continuation)
 404     {
 405       fputs (the_list->string, the_stream);
 406       putc ('\n', the_stream);
 407     }
 408   return;
 409 }
 410 \f
 411 int
 412 close_the_streams ()
 413 {
 414   register stream_list rem;
 415   for (rem = the_streams;
 416        rem != ((stream_list) NULL);
 417        rem = rem->rest_streams)
 418     no_problems = (no_problems &&
 419                    ((*rem->action) (rem->handle) == 0));
 420   the_streams = ((stream_list) NULL);
 421   return (no_problems ? 0 : 1);
 422 }
 423
 424 void
 425 add_a_stream (the_stream, closing_action)
 426      FILE *the_stream;
 427      int (*closing_action)();
 428 {
 429   stream_list old = the_streams;
 430   the_streams = new_stream ();
 431   the_streams->handle = the_stream;
 432   the_streams->action = closing_action;
 433   the_streams->rest_streams = old;
 434   return;
 435 }
 436
 437 int
 438 my_fclose (the_file)
 439      FILE *the_file;
 440 {
 441   putc ('\n', the_file);
 442   fflush (the_file);
 443   return fclose (the_file);
 444 }
 445
 446 boolean
 447 open_a_file (name)
 448      char *name;
 449 {
 450   FILE *the_stream = fopen (name, "a");
 451   if (the_stream != ((FILE *) NULL))
 452     {
 453       add_a_stream (the_stream, my_fclose);
 454       if (the_user == ((char *) NULL))
 455         file_preface = make_file_preface ();
 456       write_line_list (file_preface, the_stream);
 457       return true;
 458     }
 459   return false;
 460 }
 461
 462 void
 463 put_string (s)
 464      char *s;
 465 {
 466   register stream_list rem;
 467   for (rem = the_streams;
 468        rem != ((stream_list) NULL);
 469        rem = rem->rest_streams)
 470     fputs (s, rem->handle);
 471   return;
 472 }
 473
 474 void
 475 put_line (string)
 476      char *string;
 477 {
 478   register stream_list rem;
 479   for (rem = the_streams;
 480        rem != ((stream_list) NULL);
 481        rem = rem->rest_streams)
 482     {
 483       char *s = string;
 484       int column = 0;
 485
 486       /* Divide STRING into lines.  */
 487       while (*s != 0)
 488         {
 489           char *breakpos;
 490
 491           /* Find the last char that fits.  */
 492           for (breakpos = s; *breakpos && column < 78; ++breakpos)
 493             {
 494               if (*breakpos == '\t')
 495                 column += 8;
 496               else
 497                 column++;
 498             }
 499           /* If we didn't reach end of line, break the line.  */
 500           if (*breakpos)
 501             {
 502               /* Back up to just after the last comma that fits.  */
 503               while (breakpos != s && breakpos[-1] != ',') --breakpos;
 504
 505               if (breakpos == s)
 506                 {
 507                   /* If no comma fits, move past the first address anyway.  */
 508                   while (*breakpos != 0 && *breakpos != ',') ++breakpos;
 509                   if (*breakpos != 0)
 510                     /* Include the comma after it.  */
 511                     ++breakpos;
 512                 }
 513             }
 514           /* Output that much, then break the line.  */
 515           fwrite (s, 1, breakpos - s, rem->handle);
 516           column = 8;
 517
 518           /* Skip whitespace and prepare to print more addresses.  */
 519           s = breakpos;
 520           while (*s == ' ' || *s == '\t') ++s;
 521           if (*s != 0)
 522             fputs ("\n\t", rem->handle);
 523         }
 524       putc ('\n', rem->handle);
 525     }
 526   return;
 527 }
 528 \f
 529 #define mail_error error
 530
 531 /* Handle an FCC field.  FIELD is the text of the first line (after
 532    the header name), and THE_LIST holds the continuation lines if any.
 533    Call open_a_file for each file.  */
 534
 535 void
 536 setup_files (the_list, field)
 537      register line_list the_list;
 538      register char *field;
 539 {
 540   register char *start;
 541   register char c;
 542   while (true)
 543     {
 544       while (((c = *field) != '\0')
 545              && (c == ' '
 546                  || c == '\t'
 547                  || c == ','))
 548         field += 1;
 549       if (c != '\0')
 550         {
 551           start = field;
 552           while (((c = *field) != '\0')
 553                  && c != ' '
 554                  && c != '\t'
 555                  && c != ',')
 556             field += 1;
 557           *field = '\0';
 558           if (!open_a_file (start))
 559             mail_error ("Could not open file %s", start);
 560           *field = c;
 561           if (c != '\0') continue;
 562         }
 563       if (the_list == ((line_list) NULL))
 564         return;
 565       field = the_list->string;
 566       the_list = the_list->continuation;
 567     }
 568 }
 569 \f
 570 /* Compute the total size of all recipient names stored in THE_HEADER.
 571    The result says how big to make the buffer to pass to parse_header.  */
 572
 573 int
 574 args_size (the_header)
 575      header the_header;
 576 {
 577   register header old = the_header;
 578   register line_list rem;
 579   register int size = 0;
 580   do
 581     {
 582       char *field;
 583       register char *keyword = get_keyword (the_header->text->string, &field);
 584       if ((strcmp (keyword, "TO") == 0)
 585           || (strcmp (keyword, "CC") == 0)
 586           || (strcmp (keyword, "BCC") == 0))
 587         {
 588           size += 1 + strlen (field);
 589           for (rem = the_header->text->continuation;
 590                rem != NIL;
 591                rem = rem->continuation)
 592             size += 1 + strlen (rem->string);
 593         }
 594       the_header = the_header->next;
 595     } while (the_header != old);
 596   return size;
 597 }
 598
 599 /* Scan the header described by the lists THE_HEADER,
 600    and put all recipient names into the buffer WHERE.
 601    Precede each recipient name with a space.
 602
 603    Also, if the header has any FCC fields, call setup_files for each one.  */
 604
 605 void
 606 parse_header (the_header, where)
 607      header the_header;
 608      register char *where;
 609 {
 610   register header old = the_header;
 611   do
 612     {
 613       char *field;
 614       register char *keyword = get_keyword (the_header->text->string, &field);
 615       if (strcmp (keyword, "TO") == 0)
 616         where = add_field (the_header->text->continuation, field, where);
 617       else if (strcmp (keyword, "CC") == 0)
 618         where = add_field (the_header->text->continuation, field, where);
 619       else if (strcmp (keyword, "BCC") == 0)
 620         {
 621           where = add_field (the_header->text->continuation, field, where);
 622           the_header->previous->next = the_header->next;
 623           the_header->next->previous = the_header->previous;
 624         }
 625       else if (strcmp (keyword, "FCC") == 0)
 626         setup_files (the_header->text->continuation, field);
 627       the_header = the_header->next;
 628     } while (the_header != old);
 629   *where = '\0';
 630   return;
 631 }
 632 \f
 633 /* Read lines from the input until we get a blank line.
 634    Create a list of `header' objects, one for each header field,
 635    each of which points to a list of `line_list' objects,
 636    one for each line in that field.
 637    Continuation lines are grouped in the headers they continue.  */
 638
 639 header
 640 read_header ()
 641 {
 642   register header the_header = ((header) NULL);
 643   register line_list *next_line = ((line_list *) NULL);
 644
 645   init_linebuffer (&lb);
 646
 647   do
 648     {
 649       long length;
 650       register char *line;
 651
 652       readline (&lb, stdin);
 653       line = lb.buffer;
 654       length = strlen (line);
 655       if (length == 0) break;
 656
 657       if (has_keyword (line))
 658         {
 659           register header old = the_header;
 660           the_header = new_header ();
 661           if (old == ((header) NULL))
 662             {
 663               the_header->next = the_header;
 664               the_header->previous = the_header;
 665             }
 666           else
 667             {
 668               the_header->previous = old;
 669               the_header->next = old->next;
 670               old->next = the_header;
 671             }
 672           next_line = &(the_header->text);
 673         }
 674
 675       if (next_line == ((line_list *) NULL))
 676         {
 677           /* Not a valid header */
 678           exit (1);
 679         }
 680       *next_line = new_list ();
 681       (*next_line)->string = alloc_string (length);
 682       strcpy (((*next_line)->string), line);
 683       next_line = &((*next_line)->continuation);
 684       *next_line = NIL;
 685
 686     } while (true);
 687
 688   return the_header->next;
 689 }
 690 \f
 691 void
 692 write_header (the_header)
 693      header the_header;
 694 {
 695   register header old = the_header;
 696   do
 697     {
 698       register line_list the_list;
 699       for (the_list = the_header->text;
 700            the_list != NIL;
 701            the_list = the_list->continuation)
 702         put_line (the_list->string);
 703       the_header = the_header->next;
 704     } while (the_header != old);
 705   put_line ("");
 706   return;
 707 }
 708 \f
 709 int
 710 main (argc, argv)
 711      int argc;
 712      char **argv;
 713 {
 714   char *command_line;
 715   header the_header;
 716   long name_length;
 717   char *mail_program_name;
 718   char buf[BUFLEN + 1];
 719   register int size;
 720   FILE *the_pipe;
 721
 722   extern char *getenv ();
 723
 724   mail_program_name = getenv ("FAKEMAILER");
 725   if (!(mail_program_name && *mail_program_name))
 726     mail_program_name = MAIL_PROGRAM_NAME;
 727   name_length = strlen (mail_program_name);
 728
 729   my_name = MY_NAME;
 730   the_streams = ((stream_list) NULL);
 731   the_date = ((char *) NULL);
 732   the_user = ((char *) NULL);
 733
 734   the_header = read_header ();
 735   command_line = alloc_string (name_length + args_size (the_header));
 736   strcpy (command_line, mail_program_name);
 737   parse_header (the_header, &command_line[name_length]);
 738
 739   the_pipe = popen (command_line, "w");
 740   if (the_pipe == ((FILE *) NULL))
 741     fatal ("cannot open pipe to real mailer");
 742
 743   add_a_stream (the_pipe, pclose);
 744
 745   write_header (the_header);
 746
 747   /* Dump the message itself */
 748
 749   while (!feof (stdin))
 750     {
 751       size = fread (buf, 1, BUFLEN, stdin);
 752       buf[size] = '\0';
 753       put_string (buf);
 754     }
 755
 756   exit (close_the_streams ());
 757 }
 758
 759 #endif /* not MSDOS */
 760 #endif /* not BSD 4.2 (or newer) */