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