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[emacs.git] / lib-src / fakemail.c
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1 /* sendmail-like interface to /bin/mail for system V,
2 Copyright (C) 1985, 1994, 1999, 2001, 2002, 2003, 2004,
3 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
5 This file is part of GNU Emacs.
7 GNU Emacs is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
10 any later version.
12 GNU Emacs is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU Emacs; see the file COPYING. If not, write to
19 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
20 Boston, MA 02110-1301, USA. */
22 #define NO_SHORTNAMES
23 #define _XOPEN_SOURCE 500 /* for cuserid */
25 #ifdef HAVE_CONFIG_H
26 #include <config.h>
27 #endif
29 #if defined (BSD_SYSTEM) && !defined (BSD4_1) && !defined (USE_FAKEMAIL)
30 /* This program isnot used in BSD, so just avoid loader complaints. */
31 int
32 main ()
34 return 0;
36 #else /* not BSD 4.2 (or newer) */
37 #ifdef MSDOS
38 int
39 main ()
41 return 0;
43 #else /* not MSDOS */
44 /* This conditional contains all the rest of the file. */
46 /* These are defined in config in some versions. */
48 #ifdef static
49 #undef static
50 #endif
52 #ifdef WINDOWSNT
53 #include "ntlib.h"
54 #endif
56 #include <stdio.h>
57 #include <string.h>
58 #include <ctype.h>
59 #include <time.h>
60 #include <pwd.h>
62 /* This is to declare cuserid. */
63 #ifdef HAVE_UNISTD_H
64 #include <unistd.h>
65 #endif
67 /* Type definitions */
69 #define boolean int
70 #define true 1
71 #define false 0
73 #define TM_YEAR_BASE 1900
75 /* Nonzero if TM_YEAR is a struct tm's tm_year value that causes
76 asctime to have well-defined behavior. */
77 #ifndef TM_YEAR_IN_ASCTIME_RANGE
78 # define TM_YEAR_IN_ASCTIME_RANGE(tm_year) \
79 (1000 - TM_YEAR_BASE <= (tm_year) && (tm_year) <= 9999 - TM_YEAR_BASE)
80 #endif
82 /* Various lists */
84 struct line_record
86 char *string;
87 struct line_record *continuation;
89 typedef struct line_record *line_list;
91 struct header_record
93 line_list text;
94 struct header_record *next;
95 struct header_record *previous;
97 typedef struct header_record *header;
99 struct stream_record
101 FILE *handle;
102 int (*action)();
103 struct stream_record *rest_streams;
105 typedef struct stream_record *stream_list;
107 /* A `struct linebuffer' is a structure which holds a line of text.
108 * `readline' reads a line from a stream into a linebuffer
109 * and works regardless of the length of the line.
112 struct linebuffer
114 long size;
115 char *buffer;
118 struct linebuffer lb;
120 #define new_list() \
121 ((line_list) xmalloc (sizeof (struct line_record)))
122 #define new_header() \
123 ((header) xmalloc (sizeof (struct header_record)))
124 #define new_stream() \
125 ((stream_list) xmalloc (sizeof (struct stream_record)))
126 #define alloc_string(nchars) \
127 ((char *) xmalloc ((nchars) + 1))
129 /* Global declarations */
131 #define BUFLEN 1024
132 #define KEYWORD_SIZE 256
133 #define FROM_PREFIX "From"
134 #define MY_NAME "fakemail"
135 #define NIL ((line_list) NULL)
136 #define INITIAL_LINE_SIZE 200
138 #ifndef MAIL_PROGRAM_NAME
139 #define MAIL_PROGRAM_NAME "/bin/mail"
140 #endif
142 static char *my_name;
143 static char *the_date;
144 static char *the_user;
145 static line_list file_preface;
146 static stream_list the_streams;
147 static boolean no_problems = true;
149 extern FILE *popen ();
150 extern int fclose (), pclose ();
152 #ifdef CURRENT_USER
153 extern struct passwd *getpwuid ();
154 extern unsigned short geteuid ();
155 static struct passwd *my_entry;
156 #define cuserid(s) \
157 (my_entry = getpwuid (((int) geteuid ())), \
158 my_entry->pw_name)
159 #endif
161 /* Utilities */
163 /* Print error message. `s1' is printf control string, `s2' is arg for it. */
165 static void
166 error (s1, s2)
167 char *s1, *s2;
169 printf ("%s: ", my_name);
170 printf (s1, s2);
171 printf ("\n");
172 no_problems = false;
175 /* Print error message and exit. */
177 static void
178 fatal (s1)
179 char *s1;
181 error ("%s", s1);
182 exit (EXIT_FAILURE);
185 /* Like malloc but get fatal error if memory is exhausted. */
187 static long *
188 xmalloc (size)
189 int size;
191 long *result = (long *) malloc (((unsigned) size));
192 if (result == ((long *) NULL))
193 fatal ("virtual memory exhausted");
194 return result;
197 static long *
198 xrealloc (ptr, size)
199 long *ptr;
200 int size;
202 long *result = (long *) realloc (ptr, ((unsigned) size));
203 if (result == ((long *) NULL))
204 fatal ("virtual memory exhausted");
205 return result;
208 /* Initialize a linebuffer for use */
210 void
211 init_linebuffer (linebuffer)
212 struct linebuffer *linebuffer;
214 linebuffer->size = INITIAL_LINE_SIZE;
215 linebuffer->buffer = ((char *) xmalloc (INITIAL_LINE_SIZE));
218 /* Read a line of text from `stream' into `linebuffer'.
219 Return the length of the line. */
221 long
222 readline (linebuffer, stream)
223 struct linebuffer *linebuffer;
224 FILE *stream;
226 char *buffer = linebuffer->buffer;
227 char *p = linebuffer->buffer;
228 char *end = p + linebuffer->size;
230 while (true)
232 int c = getc (stream);
233 if (p == end)
235 linebuffer->size *= 2;
236 buffer = ((char *) xrealloc ((long *)buffer, linebuffer->size));
237 p = buffer + (p - linebuffer->buffer);
238 end = buffer + linebuffer->size;
239 linebuffer->buffer = buffer;
241 if (c < 0 || c == '\n')
243 *p = 0;
244 break;
246 *p++ = c;
249 return p - buffer;
252 /* Extract a colon-terminated keyword from the string FIELD.
253 Return that keyword as a string stored in a static buffer.
254 Store the address of the rest of the string into *REST.
256 If there is no keyword, return NULL and don't alter *REST. */
258 char *
259 get_keyword (field, rest)
260 register char *field;
261 char **rest;
263 static char keyword[KEYWORD_SIZE];
264 register char *ptr;
265 register int c;
267 ptr = &keyword[0];
268 c = (unsigned char) *field++;
269 if (isspace (c) || c == ':')
270 return ((char *) NULL);
271 *ptr++ = (islower (c) ? toupper (c) : c);
272 while (((c = (unsigned char) *field++) != ':') && ! isspace (c))
273 *ptr++ = (islower (c) ? toupper (c) : c);
274 *ptr++ = '\0';
275 while (isspace (c))
276 c = (unsigned char) *field++;
277 if (c != ':')
278 return ((char *) NULL);
279 *rest = field;
280 return &keyword[0];
283 /* Nonzero if the string FIELD starts with a colon-terminated keyword. */
285 boolean
286 has_keyword (field)
287 char *field;
289 char *ignored;
290 return (get_keyword (field, &ignored) != ((char *) NULL));
293 /* Store the string FIELD, followed by any lines in THE_LIST,
294 into the buffer WHERE.
295 Concatenate lines, putting just a space between them.
296 Delete everything contained in parentheses.
297 When a recipient name contains <...>, we discard
298 everything except what is inside the <...>.
300 We don't pay attention to overflowing WHERE;
301 the caller has to make it big enough. */
303 char *
304 add_field (the_list, field, where)
305 line_list the_list;
306 register char *field, *where;
308 register char c;
309 while (true)
311 char *this_recipient_where;
312 int in_quotes = 0;
314 *where++ = ' ';
315 this_recipient_where = where;
317 while ((c = *field++) != '\0')
319 if (c == '\\')
320 *where++ = c;
321 else if (c == '"')
323 in_quotes = ! in_quotes;
324 *where++ = c;
326 else if (in_quotes)
327 *where++ = c;
328 else if (c == '(')
330 while (*field && *field != ')') ++field;
331 if (! (*field++)) break; /* no close */
332 continue;
334 else if (c == ',')
336 *where++ = ' ';
337 /* When we get to the end of one recipient,
338 don't discard it if the next one has <...>. */
339 this_recipient_where = where;
341 else if (c == '<')
342 /* Discard everything we got before the `<'. */
343 where = this_recipient_where;
344 else if (c == '>')
345 /* Discard the rest of this name that follows the `>'. */
347 while (*field && *field != ',') ++field;
348 if (! (*field++)) break; /* no comma */
349 continue;
351 else
352 *where++ = c;
354 if (the_list == NIL) break;
355 field = the_list->string;
356 the_list = the_list->continuation;
358 return where;
361 line_list
362 make_file_preface ()
364 char *the_string, *temp;
365 long idiotic_interface;
366 struct tm *tm;
367 long prefix_length;
368 long user_length;
369 long date_length;
370 line_list result;
372 prefix_length = strlen (FROM_PREFIX);
373 time (&idiotic_interface);
374 /* Convert to a string, checking for out-of-range time stamps.
375 Don't use 'ctime', as that might dump core if the hardware clock
376 is set to a bizarre value. */
377 tm = localtime (&idiotic_interface);
378 if (! (tm && TM_YEAR_IN_ASCTIME_RANGE (tm->tm_year)
379 && (the_date = asctime (tm))))
380 fatal ("current time is out of range");
381 /* the_date has an unwanted newline at the end */
382 date_length = strlen (the_date) - 1;
383 the_date[date_length] = '\0';
384 temp = cuserid ((char *) NULL);
385 user_length = strlen (temp);
386 the_user = alloc_string (user_length + 1);
387 strcpy (the_user, temp);
388 the_string = alloc_string (3 + prefix_length
389 + user_length
390 + date_length);
391 temp = the_string;
392 strcpy (temp, FROM_PREFIX);
393 temp = &temp[prefix_length];
394 *temp++ = ' ';
395 strcpy (temp, the_user);
396 temp = &temp[user_length];
397 *temp++ = ' ';
398 strcpy (temp, the_date);
399 result = new_list ();
400 result->string = the_string;
401 result->continuation = ((line_list) NULL);
402 return result;
405 void
406 write_line_list (the_list, the_stream)
407 register line_list the_list;
408 FILE *the_stream;
410 for ( ;
411 the_list != ((line_list) NULL) ;
412 the_list = the_list->continuation)
414 fputs (the_list->string, the_stream);
415 putc ('\n', the_stream);
417 return;
421 close_the_streams ()
423 register stream_list rem;
424 for (rem = the_streams;
425 rem != ((stream_list) NULL);
426 rem = rem->rest_streams)
427 no_problems = (no_problems &&
428 ((*rem->action) (rem->handle) == 0));
429 the_streams = ((stream_list) NULL);
430 return (no_problems ? EXIT_SUCCESS : EXIT_FAILURE);
433 void
434 add_a_stream (the_stream, closing_action)
435 FILE *the_stream;
436 int (*closing_action)();
438 stream_list old = the_streams;
439 the_streams = new_stream ();
440 the_streams->handle = the_stream;
441 the_streams->action = closing_action;
442 the_streams->rest_streams = old;
443 return;
447 my_fclose (the_file)
448 FILE *the_file;
450 putc ('\n', the_file);
451 fflush (the_file);
452 return fclose (the_file);
455 boolean
456 open_a_file (name)
457 char *name;
459 FILE *the_stream = fopen (name, "a");
460 if (the_stream != ((FILE *) NULL))
462 add_a_stream (the_stream, my_fclose);
463 if (the_user == ((char *) NULL))
464 file_preface = make_file_preface ();
465 write_line_list (file_preface, the_stream);
466 return true;
468 return false;
471 void
472 put_string (s)
473 char *s;
475 register stream_list rem;
476 for (rem = the_streams;
477 rem != ((stream_list) NULL);
478 rem = rem->rest_streams)
479 fputs (s, rem->handle);
480 return;
483 void
484 put_line (string)
485 char *string;
487 register stream_list rem;
488 for (rem = the_streams;
489 rem != ((stream_list) NULL);
490 rem = rem->rest_streams)
492 char *s = string;
493 int column = 0;
495 /* Divide STRING into lines. */
496 while (*s != 0)
498 char *breakpos;
500 /* Find the last char that fits. */
501 for (breakpos = s; *breakpos && column < 78; ++breakpos)
503 if (*breakpos == '\t')
504 column += 8;
505 else
506 column++;
508 /* If we didn't reach end of line, break the line. */
509 if (*breakpos)
511 /* Back up to just after the last comma that fits. */
512 while (breakpos != s && breakpos[-1] != ',') --breakpos;
514 if (breakpos == s)
516 /* If no comma fits, move past the first address anyway. */
517 while (*breakpos != 0 && *breakpos != ',') ++breakpos;
518 if (*breakpos != 0)
519 /* Include the comma after it. */
520 ++breakpos;
523 /* Output that much, then break the line. */
524 fwrite (s, 1, breakpos - s, rem->handle);
525 column = 8;
527 /* Skip whitespace and prepare to print more addresses. */
528 s = breakpos;
529 while (*s == ' ' || *s == '\t') ++s;
530 if (*s != 0)
531 fputs ("\n\t", rem->handle);
533 putc ('\n', rem->handle);
535 return;
538 #define mail_error error
540 /* Handle an FCC field. FIELD is the text of the first line (after
541 the header name), and THE_LIST holds the continuation lines if any.
542 Call open_a_file for each file. */
544 void
545 setup_files (the_list, field)
546 register line_list the_list;
547 register char *field;
549 register char *start;
550 register char c;
551 while (true)
553 while (((c = *field) != '\0')
554 && (c == ' '
555 || c == '\t'
556 || c == ','))
557 field += 1;
558 if (c != '\0')
560 start = field;
561 while (((c = *field) != '\0')
562 && c != ' '
563 && c != '\t'
564 && c != ',')
565 field += 1;
566 *field = '\0';
567 if (!open_a_file (start))
568 mail_error ("Could not open file %s", start);
569 *field = c;
570 if (c != '\0') continue;
572 if (the_list == ((line_list) NULL))
573 return;
574 field = the_list->string;
575 the_list = the_list->continuation;
579 /* Compute the total size of all recipient names stored in THE_HEADER.
580 The result says how big to make the buffer to pass to parse_header. */
583 args_size (the_header)
584 header the_header;
586 register header old = the_header;
587 register line_list rem;
588 register int size = 0;
591 char *field;
592 register char *keyword = get_keyword (the_header->text->string, &field);
593 if ((strcmp (keyword, "TO") == 0)
594 || (strcmp (keyword, "CC") == 0)
595 || (strcmp (keyword, "BCC") == 0))
597 size += 1 + strlen (field);
598 for (rem = the_header->text->continuation;
599 rem != NIL;
600 rem = rem->continuation)
601 size += 1 + strlen (rem->string);
603 the_header = the_header->next;
604 } while (the_header != old);
605 return size;
608 /* Scan the header described by the lists THE_HEADER,
609 and put all recipient names into the buffer WHERE.
610 Precede each recipient name with a space.
612 Also, if the header has any FCC fields, call setup_files for each one. */
614 void
615 parse_header (the_header, where)
616 header the_header;
617 register char *where;
619 register header old = the_header;
622 char *field;
623 register char *keyword = get_keyword (the_header->text->string, &field);
624 if (strcmp (keyword, "TO") == 0)
625 where = add_field (the_header->text->continuation, field, where);
626 else if (strcmp (keyword, "CC") == 0)
627 where = add_field (the_header->text->continuation, field, where);
628 else if (strcmp (keyword, "BCC") == 0)
630 where = add_field (the_header->text->continuation, field, where);
631 the_header->previous->next = the_header->next;
632 the_header->next->previous = the_header->previous;
634 else if (strcmp (keyword, "FCC") == 0)
635 setup_files (the_header->text->continuation, field);
636 the_header = the_header->next;
637 } while (the_header != old);
638 *where = '\0';
639 return;
642 /* Read lines from the input until we get a blank line.
643 Create a list of `header' objects, one for each header field,
644 each of which points to a list of `line_list' objects,
645 one for each line in that field.
646 Continuation lines are grouped in the headers they continue. */
648 header
649 read_header ()
651 register header the_header = ((header) NULL);
652 register line_list *next_line = ((line_list *) NULL);
654 init_linebuffer (&lb);
658 long length;
659 register char *line;
661 readline (&lb, stdin);
662 line = lb.buffer;
663 length = strlen (line);
664 if (length == 0) break;
666 if (has_keyword (line))
668 register header old = the_header;
669 the_header = new_header ();
670 if (old == ((header) NULL))
672 the_header->next = the_header;
673 the_header->previous = the_header;
675 else
677 the_header->previous = old;
678 the_header->next = old->next;
679 old->next = the_header;
681 next_line = &(the_header->text);
684 if (next_line == ((line_list *) NULL))
686 /* Not a valid header */
687 exit (EXIT_FAILURE);
689 *next_line = new_list ();
690 (*next_line)->string = alloc_string (length);
691 strcpy (((*next_line)->string), line);
692 next_line = &((*next_line)->continuation);
693 *next_line = NIL;
695 } while (true);
697 if (! the_header)
698 fatal ("input message has no header");
699 return the_header->next;
702 void
703 write_header (the_header)
704 header the_header;
706 register header old = the_header;
709 register line_list the_list;
710 for (the_list = the_header->text;
711 the_list != NIL;
712 the_list = the_list->continuation)
713 put_line (the_list->string);
714 the_header = the_header->next;
715 } while (the_header != old);
716 put_line ("");
717 return;
721 main (argc, argv)
722 int argc;
723 char **argv;
725 char *command_line;
726 header the_header;
727 long name_length;
728 char *mail_program_name;
729 char buf[BUFLEN + 1];
730 register int size;
731 FILE *the_pipe;
733 extern char *getenv ();
735 mail_program_name = getenv ("FAKEMAILER");
736 if (!(mail_program_name && *mail_program_name))
737 mail_program_name = MAIL_PROGRAM_NAME;
738 name_length = strlen (mail_program_name);
740 my_name = MY_NAME;
741 the_streams = ((stream_list) NULL);
742 the_date = ((char *) NULL);
743 the_user = ((char *) NULL);
745 the_header = read_header ();
746 command_line = alloc_string (name_length + args_size (the_header));
747 strcpy (command_line, mail_program_name);
748 parse_header (the_header, &command_line[name_length]);
750 the_pipe = popen (command_line, "w");
751 if (the_pipe == ((FILE *) NULL))
752 fatal ("cannot open pipe to real mailer");
754 add_a_stream (the_pipe, pclose);
756 write_header (the_header);
758 /* Dump the message itself */
760 while (!feof (stdin))
762 size = fread (buf, 1, BUFLEN, stdin);
763 buf[size] = '\0';
764 put_string (buf);
767 exit (close_the_streams ());
770 #endif /* not MSDOS */
771 #endif /* not BSD 4.2 (or newer) */
773 /* arch-tag: acb0afa6-315a-4c5b-b9e3-def5725c8783
774 (do not change this comment) */
776 /* fakemail.c ends here */