lib-src/fakemail.c

   1 /* sendmail-like interface to /bin/mail for system V,
   2    Copyright (C) 1985 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, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20
  21 #define NO_SHORTNAMES
  22 #include <../src/config.h>
  23
  24 #if defined (BSD) && !defined (BSD4_1) && !defined (USE_FAKEMAIL)
  25 /* This program isnot used in BSD, so just avoid loader complaints.  */
  26 main ()
  27 {
  28 }
  29 #else /* not BSD 4.2 (or newer) */
  30 #ifdef MSDOS
  31 main ()
  32 {
  33 }
  34 #else /* not MSDOS */
  35 /* This conditional contains all the rest of the file.  */
  36
  37 /* These are defined in config in some versions. */
  38
  39 #ifdef static
  40 #undef static
  41 #endif
  42
  43 #ifdef read
  44 #undef read
  45 #undef write
  46 #undef open
  47 #undef close
  48 #endif
  49
  50 #include <stdio.h>
  51 #include <string.h>
  52 #include <ctype.h>
  53 #include <time.h>
  54 #include <pwd.h>
  55 \f
  56 /* Type definitions */
  57
  58 #define boolean int
  59 #define true 1
  60 #define false 0
  61
  62 /* Various lists */
  63
  64 struct line_record
  65 {
  66   char *string;
  67   struct line_record *continuation;
  68 };
  69 typedef struct line_record *line_list;
  70
  71 struct header_record
  72 {
  73   line_list text;
  74   struct header_record *next;
  75   struct header_record *previous;
  76 };
  77 typedef struct header_record *header;
  78
  79 struct stream_record
  80 {
  81   FILE *handle;
  82   int (*action)();
  83   struct stream_record *rest_streams;
  84 };
  85 typedef struct stream_record *stream_list;
  86
  87 /* A `struct linebuffer' is a structure which holds a line of text.
  88  * `readline' reads a line from a stream into a linebuffer
  89  * and works regardless of the length of the line.
  90  */
  91
  92 struct linebuffer
  93 {
  94   long size;
  95   char *buffer;
  96 };
  97
  98 struct linebuffer lb;
  99
 100 #define new_list()                                      \
 101   ((line_list) xmalloc (sizeof (struct line_record)))
 102 #define new_header()                            \
 103   ((header) xmalloc (sizeof (struct header_record)))
 104 #define new_stream()                            \
 105   ((stream_list) xmalloc (sizeof (struct stream_record)))
 106 #define alloc_string(nchars)                            \
 107   ((char *) xmalloc ((nchars) + 1))
 108 \f
 109 /* Global declarations */
 110
 111 #define BUFLEN 1024
 112 #define KEYWORD_SIZE 256
 113 #define FROM_PREFIX "From"
 114 #define MY_NAME "fakemail"
 115 #define NIL ((line_list) NULL)
 116 #define INITIAL_LINE_SIZE 200
 117
 118 #ifndef MAIL_PROGRAM_NAME
 119 #define MAIL_PROGRAM_NAME "/bin/mail"
 120 #endif
 121
 122 static char *my_name;
 123 static char *the_date;
 124 static char *the_user;
 125 static line_list file_preface;
 126 static stream_list the_streams;
 127 static boolean no_problems = true;
 128
 129 extern FILE *popen ();
 130 extern int fclose (), pclose ();
 131 extern char *malloc (), *realloc ();
 132
 133 #ifdef CURRENT_USER
 134 extern struct passwd *getpwuid ();
 135 extern unsigned short geteuid ();
 136 static struct passwd *my_entry;
 137 #define cuserid(s)                              \
 138 (my_entry = getpwuid (((int) geteuid ())),      \
 139  my_entry->pw_name)
 140 #endif
 141 \f
 142 /* Utilities */
 143
 144 /* Print error message.  `s1' is printf control string, `s2' is arg for it. */
 145
 146 static void
 147 error (s1, s2)
 148      char *s1, *s2;
 149 {
 150   printf ("%s: ", my_name);
 151   printf (s1, s2);
 152   printf ("\n");
 153   no_problems = false;
 154 }
 155
 156 /* Print error message and exit.  */
 157
 158 static void
 159 fatal (s1, s2)
 160      char *s1, *s2;
 161 {
 162   error (s1, s2);
 163   exit (1);
 164 }
 165
 166 /* Like malloc but get fatal error if memory is exhausted.  */
 167
 168 static char *
 169 xmalloc (size)
 170      int size;
 171 {
 172   char *result = malloc (((unsigned) size));
 173   if (result == ((char *) NULL))
 174     fatal ("virtual memory exhausted", 0);
 175   return result;
 176 }
 177
 178 static char *
 179 xrealloc (ptr, size)
 180      char *ptr;
 181      int size;
 182 {
 183   char *result = realloc (ptr, ((unsigned) size));
 184   if (result == ((char *) NULL))
 185     fatal ("virtual memory exhausted");
 186   return result;
 187 }
 188 \f
 189 /* Initialize a linebuffer for use */
 190
 191 void
 192 init_linebuffer (linebuffer)
 193      struct linebuffer *linebuffer;
 194 {
 195   linebuffer->size = INITIAL_LINE_SIZE;
 196   linebuffer->buffer = ((char *) xmalloc (INITIAL_LINE_SIZE));
 197 }
 198
 199 /* Read a line of text from `stream' into `linebuffer'.
 200  * Return the length of the line.
 201  */
 202
 203 long
 204 readline (linebuffer, stream)
 205      struct linebuffer *linebuffer;
 206      FILE *stream;
 207 {
 208   char *buffer = linebuffer->buffer;
 209   char *p = linebuffer->buffer;
 210   char *end = p + linebuffer->size;
 211
 212   while (true)
 213     {
 214       int c = getc (stream);
 215       if (p == end)
 216         {
 217           linebuffer->size *= 2;
 218           buffer = ((char *) xrealloc (buffer, linebuffer->size));
 219           p += buffer - linebuffer->buffer;
 220           end += buffer - linebuffer->buffer;
 221           linebuffer->buffer = buffer;
 222         }
 223       if (c < 0 || c == '\n')
 224         {
 225           *p = 0;
 226           break;
 227         }
 228       *p++ = c;
 229     }
 230
 231   return p - buffer;
 232 }
 233 \f
 234 char *
 235 get_keyword (field, rest)
 236      register char *field;
 237      char **rest;
 238 {
 239   static char keyword[KEYWORD_SIZE];
 240   register char *ptr;
 241   register char c;
 242
 243   ptr = &keyword[0];
 244   c = *field++;
 245   if ((isspace (c)) || (c == ':'))
 246     return ((char *) NULL);
 247   *ptr++ = ((islower (c)) ? (toupper (c)) : c);
 248   while (((c = *field++) != ':') && (!(isspace (c))))
 249     *ptr++ = ((islower (c)) ? (toupper (c)) : c);
 250   *ptr++ = '\0';
 251   while (isspace (c)) c = *field++;
 252   if (c != ':') return ((char *) NULL);
 253   *rest = field;
 254   return &keyword[0];
 255 }
 256
 257 boolean
 258 has_keyword (field)
 259      char *field;
 260 {
 261   char *ignored;
 262   return (get_keyword (field, &ignored) != ((char *) NULL));
 263 }
 264
 265 char *
 266 add_field (the_list, field, where)
 267      line_list the_list;
 268      register char *field, *where;
 269 {
 270   register char c;
 271   while (true)
 272     {
 273       *where++ = ' ';
 274       while ((c = *field++) != '\0')
 275         {
 276           if (c == '(')
 277             {
 278               while (*field && *field != ')') ++field;
 279               if (! (*field++)) break; /* no closer */
 280               if (! (*field))   break; /* closerNULL */
 281               c = *field;
 282             }
 283           *where++ = ((c == ','||c=='>'||c=='<') ? ' ' : c);
 284         }
 285       if (the_list == NIL) break;
 286       field = the_list->string;
 287       the_list = the_list->continuation;
 288     }
 289   return where;
 290 }
 291 \f
 292 line_list
 293 make_file_preface ()
 294 {
 295   char *the_string, *temp;
 296   long idiotic_interface;
 297   long prefix_length;
 298   long user_length;
 299   long date_length;
 300   line_list result;
 301
 302   prefix_length = strlen (FROM_PREFIX);
 303   time (&idiotic_interface);
 304   the_date = ctime (&idiotic_interface);
 305   /* the_date has an unwanted newline at the end */
 306   date_length = strlen (the_date) - 1;
 307   the_date[date_length] = '\0';
 308   temp = cuserid ((char *) NULL);
 309   user_length = strlen (temp);
 310   the_user = alloc_string (user_length + 1);
 311   strcpy (the_user, temp);
 312   the_string = alloc_string (3 + prefix_length +
 313                              user_length +
 314                              date_length);
 315   temp = the_string;
 316   strcpy (temp, FROM_PREFIX);
 317   temp = &temp[prefix_length];
 318   *temp++ = ' ';
 319   strcpy (temp, the_user);
 320   temp = &temp[user_length];
 321   *temp++ = ' ';
 322   strcpy (temp, the_date);
 323   result = new_list ();
 324   result->string = the_string;
 325   result->continuation = ((line_list) NULL);
 326   return result;
 327 }
 328
 329 void
 330 write_line_list (the_list, the_stream)
 331      register line_list the_list;
 332      FILE *the_stream;
 333 {
 334   for ( ;
 335       the_list != ((line_list) NULL) ;
 336       the_list = the_list->continuation)
 337     {
 338       fputs (the_list->string, the_stream);
 339       putc ('\n', the_stream);
 340     }
 341   return;
 342 }
 343 \f
 344 int
 345 close_the_streams ()
 346 {
 347   register stream_list rem;
 348   for (rem = the_streams;
 349        rem != ((stream_list) NULL);
 350        rem = rem->rest_streams)
 351     no_problems = (no_problems &&
 352                    ((*rem->action) (rem->handle) == 0));
 353   the_streams = ((stream_list) NULL);
 354   return (no_problems ? 0 : 1);
 355 }
 356
 357 void
 358 add_a_stream (the_stream, closing_action)
 359      FILE *the_stream;
 360      int (*closing_action)();
 361 {
 362   stream_list old = the_streams;
 363   the_streams = new_stream ();
 364   the_streams->handle = the_stream;
 365   the_streams->action = closing_action;
 366   the_streams->rest_streams = old;
 367   return;
 368 }
 369
 370 int
 371 my_fclose (the_file)
 372      FILE *the_file;
 373 {
 374   putc ('\n', the_file);
 375   fflush (the_file);
 376   return fclose (the_file);
 377 }
 378
 379 boolean
 380 open_a_file (name)
 381      char *name;
 382 {
 383   FILE *the_stream = fopen (name, "a");
 384   if (the_stream != ((FILE *) NULL))
 385     {
 386       add_a_stream (the_stream, my_fclose);
 387       if (the_user == ((char *) NULL))
 388         file_preface = make_file_preface ();
 389       write_line_list (file_preface, the_stream);
 390       return true;
 391     }
 392   return false;
 393 }
 394
 395 void
 396 put_string (s)
 397      char *s;
 398 {
 399   register stream_list rem;
 400   for (rem = the_streams;
 401        rem != ((stream_list) NULL);
 402        rem = rem->rest_streams)
 403     fputs (s, rem->handle);
 404   return;
 405 }
 406
 407 void
 408 put_line (string)
 409      char *string;
 410 {
 411   register stream_list rem;
 412   for (rem = the_streams;
 413        rem != ((stream_list) NULL);
 414        rem = rem->rest_streams)
 415     {
 416       char *s = string;
 417       int column = 0;
 418
 419       /* Divide STRING into lines.  */
 420       while (*s != 0)
 421         {
 422           char *breakpos;
 423
 424           /* Find the last char that fits.  */
 425           for (breakpos = s; *breakpos && column < 78; ++breakpos)
 426             {
 427               if (*breakpos == '\t')
 428                 column += 8;
 429               else
 430                 column++;
 431             }
 432           /* If we didn't reach end of line, break the line.  */
 433           if (*breakpos)
 434             {
 435               /* Back up to just after the last comma that fits.  */
 436               while (breakpos != s && breakpos[-1] != ',') --breakpos;
 437
 438               if (breakpos == s)
 439                 {
 440                   /* If no comma fits, move past the first address anyway.  */
 441                   while (*breakpos != 0 && *breakpos != ',') ++breakpos;
 442                   if (*breakpos != 0)
 443                     /* Include the comma after it.  */
 444                     ++breakpos;
 445                 }
 446             }
 447           /* Output that much, then break the line.  */
 448           fwrite (s, 1, breakpos - s, rem->handle);
 449           column = 8;
 450
 451           /* Skip whitespace and prepare to print more addresses.  */
 452           s = breakpos;
 453           while (*s == ' ' || *s == '\t') ++s;
 454           if (*s != 0)
 455             fputs ("\n\t", rem->handle);
 456         }
 457       putc ('\n', rem->handle);
 458     }
 459   return;
 460 }
 461 \f
 462 #define mail_error error
 463
 464 void
 465 setup_files (the_list, field)
 466      register line_list the_list;
 467      register char *field;
 468 {
 469   register char *start;
 470   register char c;
 471   while (true)
 472     {
 473       while (((c = *field) != '\0') &&
 474              ((c == ' ') ||
 475               (c == '\t') ||
 476               (c == ',')))
 477         field += 1;
 478       if (c != '\0')
 479         {
 480           start = field;
 481           while (((c = *field) != '\0') &&
 482                  (c != ' ') &&
 483                  (c != '\t') &&
 484                  (c != ','))
 485             field += 1;
 486           *field = '\0';
 487           if (!open_a_file (start))
 488             mail_error ("Could not open file %s", start);
 489           *field = c;
 490           if (c != '\0') continue;
 491         }
 492       if (the_list == ((line_list) NULL)) return;
 493       field = the_list->string;
 494       the_list = the_list->continuation;
 495     }
 496 }
 497 \f
 498 int
 499 args_size (the_header)
 500      header the_header;
 501 {
 502   register header old = the_header;
 503   register line_list rem;
 504   register int size = 0;
 505   do
 506     {
 507       char *field;
 508       register char *keyword = get_keyword (the_header->text->string, &field);
 509       if ((strcmp (keyword, "TO") == 0) ||
 510           (strcmp (keyword, "CC") == 0) ||
 511           (strcmp (keyword, "BCC") == 0))
 512         {
 513           size += 1 + strlen (field);
 514           for (rem = the_header->text->continuation;
 515                rem != NIL;
 516                rem = rem->continuation)
 517             size += 1 + strlen (rem->string);
 518         }
 519       the_header = the_header->next;
 520     } while (the_header != old);
 521   return size;
 522 }
 523
 524 parse_header (the_header, where)
 525      header the_header;
 526      register char *where;
 527 {
 528   register header old = the_header;
 529   do
 530     {
 531       char *field;
 532       register char *keyword = get_keyword (the_header->text->string, &field);
 533       if (strcmp (keyword, "TO") == 0)
 534         where = add_field (the_header->text->continuation, field, where);
 535       else if (strcmp (keyword, "CC") == 0)
 536         where = add_field (the_header->text->continuation, field, where);
 537       else if (strcmp (keyword, "BCC") == 0)
 538         {
 539           where = add_field (the_header->text->continuation, field, where);
 540           the_header->previous->next = the_header->next;
 541           the_header->next->previous = the_header->previous;
 542         }
 543       else if (strcmp (keyword, "FCC") == 0)
 544         setup_files (the_header->text->continuation, field);
 545       the_header = the_header->next;
 546     } while (the_header != old);
 547   *where = '\0';
 548   return;
 549 }
 550 \f
 551 header
 552 read_header ()
 553 {
 554   register header the_header = ((header) NULL);
 555   register line_list *next_line = ((line_list *) NULL);
 556
 557   init_linebuffer (&lb);
 558
 559   do
 560     {
 561       long length;
 562       register char *line;
 563
 564       readline (&lb, stdin);
 565       line = lb.buffer;
 566       length = strlen (line);
 567       if (length == 0) break;
 568
 569       if (has_keyword (line))
 570         {
 571           register header old = the_header;
 572           the_header = new_header ();
 573           if (old == ((header) NULL))
 574             {
 575               the_header->next = the_header;
 576               the_header->previous = the_header;
 577             }
 578           else
 579             {
 580               the_header->previous = old;
 581               the_header->next = old->next;
 582               old->next = the_header;
 583             }
 584           next_line = &(the_header->text);
 585         }
 586
 587       if (next_line == ((line_list *) NULL))
 588         {
 589           /* Not a valid header */
 590           exit (1);
 591         }
 592       *next_line = new_list ();
 593       (*next_line)->string = alloc_string (length);
 594       strcpy (((*next_line)->string), line);
 595       next_line = &((*next_line)->continuation);
 596       *next_line = NIL;
 597
 598     } while (true);
 599
 600   return the_header->next;
 601 }
 602 \f
 603 void
 604 write_header (the_header)
 605      header the_header;
 606 {
 607   register header old = the_header;
 608   do
 609     {
 610       register line_list the_list;
 611       for (the_list = the_header->text;
 612            the_list != NIL;
 613            the_list = the_list->continuation)
 614         put_line (the_list->string);
 615       the_header = the_header->next;
 616     } while (the_header != old);
 617   put_line ("");
 618   return;
 619 }
 620 \f
 621 void
 622 main (argc, argv)
 623      int argc;
 624      char **argv;
 625 {
 626   char *command_line;
 627   header the_header;
 628   long name_length;
 629   char *mail_program_name;
 630   char buf[BUFLEN + 1];
 631   register int size;
 632   FILE *the_pipe;
 633
 634   extern char *getenv ();
 635
 636   mail_program_name = getenv ("FAKEMAILER");
 637   if (!(mail_program_name && *mail_program_name))
 638     mail_program_name = MAIL_PROGRAM_NAME;
 639   name_length = strlen (mail_program_name);
 640
 641   my_name = MY_NAME;
 642   the_streams = ((stream_list) NULL);
 643   the_date = ((char *) NULL);
 644   the_user = ((char *) NULL);
 645
 646   the_header = read_header ();
 647   command_line = alloc_string (name_length + args_size (the_header));
 648   strcpy (command_line, mail_program_name);
 649   parse_header (the_header, &command_line[name_length]);
 650
 651   the_pipe = popen (command_line, "w");
 652   if (the_pipe == ((FILE *) NULL))
 653     fatal ("cannot open pipe to real mailer");
 654
 655   add_a_stream (the_pipe, pclose);
 656
 657   write_header (the_header);
 658
 659   /* Dump the message itself */
 660
 661   while (!feof (stdin))
 662     {
 663       size = fread (buf, 1, BUFLEN, stdin);
 664       buf[size] = '\0';
 665       put_string (buf);
 666     }
 667
 668   exit (close_the_streams ());
 669 }
 670
 671 #endif /* not MSDOS */
 672 #endif /* not BSD 4.2 (or newer) */