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