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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, 2009 Free Software Foundation, Inc.
5 Author: Bill Rozas <jinx@martigny.ai.mit.edu>
6 (according to ack.texi)
8 This file is part of GNU Emacs.
10 GNU Emacs is free software: you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation, either version 3 of the License, or
13 (at your option) any later version.
15 GNU Emacs is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
24 #define _XOPEN_SOURCE 500 /* for cuserid */
26 #ifdef HAVE_CONFIG_H
27 #include <config.h>
28 #endif
30 #if defined (BSD_SYSTEM) && !defined (USE_FAKEMAIL)
31 /* This program isnot used in BSD, so just avoid loader complaints. */
32 int
33 main ()
35 return 0;
37 #else /* not BSD 4.2 (or newer) */
38 #ifdef MSDOS
39 int
40 main ()
42 return 0;
44 #else /* not MSDOS */
45 /* This conditional contains all the rest of the file. */
47 /* These are defined in config in some versions. */
49 #ifdef static
50 #undef static
51 #endif
53 #ifdef WINDOWSNT
54 #include "ntlib.h"
55 #endif
57 #include <stdio.h>
58 #include <string.h>
59 #include <ctype.h>
60 #include <time.h>
61 #include <pwd.h>
63 /* This is to declare cuserid. */
64 #ifdef HAVE_UNISTD_H
65 #include <unistd.h>
66 #endif
68 /* Type definitions */
70 #define boolean int
71 #define true 1
72 #define false 0
74 #define TM_YEAR_BASE 1900
76 /* Nonzero if TM_YEAR is a struct tm's tm_year value that causes
77 asctime to have well-defined behavior. */
78 #ifndef TM_YEAR_IN_ASCTIME_RANGE
79 # define TM_YEAR_IN_ASCTIME_RANGE(tm_year) \
80 (1000 - TM_YEAR_BASE <= (tm_year) && (tm_year) <= 9999 - TM_YEAR_BASE)
81 #endif
83 /* Various lists */
85 struct line_record
87 char *string;
88 struct line_record *continuation;
90 typedef struct line_record *line_list;
92 struct header_record
94 line_list text;
95 struct header_record *next;
96 struct header_record *previous;
98 typedef struct header_record *header;
100 struct stream_record
102 FILE *handle;
103 int (*action)();
104 struct stream_record *rest_streams;
106 typedef struct stream_record *stream_list;
108 /* A `struct linebuffer' is a structure which holds a line of text.
109 * `readline' reads a line from a stream into a linebuffer
110 * and works regardless of the length of the line.
113 struct linebuffer
115 long size;
116 char *buffer;
119 struct linebuffer lb;
121 #define new_list() \
122 ((line_list) xmalloc (sizeof (struct line_record)))
123 #define new_header() \
124 ((header) xmalloc (sizeof (struct header_record)))
125 #define new_stream() \
126 ((stream_list) xmalloc (sizeof (struct stream_record)))
127 #define alloc_string(nchars) \
128 ((char *) xmalloc ((nchars) + 1))
130 /* Global declarations */
132 #define BUFLEN 1024
133 #define KEYWORD_SIZE 256
134 #define FROM_PREFIX "From"
135 #define MY_NAME "fakemail"
136 #define NIL ((line_list) NULL)
137 #define INITIAL_LINE_SIZE 200
139 #ifndef MAIL_PROGRAM_NAME
140 #define MAIL_PROGRAM_NAME "/bin/mail"
141 #endif
143 static char *my_name;
144 static char *the_date;
145 static char *the_user;
146 static line_list file_preface;
147 static stream_list the_streams;
148 static boolean no_problems = true;
150 extern FILE *popen ();
151 extern int fclose (), pclose ();
153 #ifdef CURRENT_USER
154 extern struct passwd *getpwuid ();
155 extern unsigned short geteuid ();
156 static struct passwd *my_entry;
157 #define cuserid(s) \
158 (my_entry = getpwuid (((int) geteuid ())), \
159 my_entry->pw_name)
160 #endif
162 /* Utilities */
164 /* Print error message. `s1' is printf control string, `s2' is arg for it. */
166 static void
167 error (s1, s2)
168 char *s1, *s2;
170 printf ("%s: ", my_name);
171 printf (s1, s2);
172 printf ("\n");
173 no_problems = false;
176 /* Print error message and exit. */
178 static void
179 fatal (s1)
180 char *s1;
182 error ("%s", s1);
183 exit (EXIT_FAILURE);
186 /* Like malloc but get fatal error if memory is exhausted. */
188 static long *
189 xmalloc (size)
190 int size;
192 long *result = (long *) malloc (((unsigned) size));
193 if (result == ((long *) NULL))
194 fatal ("virtual memory exhausted");
195 return result;
198 static long *
199 xrealloc (ptr, size)
200 long *ptr;
201 int size;
203 long *result = (long *) realloc (ptr, ((unsigned) size));
204 if (result == ((long *) NULL))
205 fatal ("virtual memory exhausted");
206 return result;
209 /* Initialize a linebuffer for use */
211 void
212 init_linebuffer (linebuffer)
213 struct linebuffer *linebuffer;
215 linebuffer->size = INITIAL_LINE_SIZE;
216 linebuffer->buffer = ((char *) xmalloc (INITIAL_LINE_SIZE));
219 /* Read a line of text from `stream' into `linebuffer'.
220 Return the length of the line. */
222 long
223 readline (linebuffer, stream)
224 struct linebuffer *linebuffer;
225 FILE *stream;
227 char *buffer = linebuffer->buffer;
228 char *p = linebuffer->buffer;
229 char *end = p + linebuffer->size;
231 while (true)
233 int c = getc (stream);
234 if (p == end)
236 linebuffer->size *= 2;
237 buffer = ((char *) xrealloc ((long *)buffer, linebuffer->size));
238 p = buffer + (p - linebuffer->buffer);
239 end = buffer + linebuffer->size;
240 linebuffer->buffer = buffer;
242 if (c < 0 || c == '\n')
244 *p = 0;
245 break;
247 *p++ = c;
250 return p - buffer;
253 /* Extract a colon-terminated keyword from the string FIELD.
254 Return that keyword as a string stored in a static buffer.
255 Store the address of the rest of the string into *REST.
257 If there is no keyword, return NULL and don't alter *REST. */
259 char *
260 get_keyword (field, rest)
261 register char *field;
262 char **rest;
264 static char keyword[KEYWORD_SIZE];
265 register char *ptr;
266 register int c;
268 ptr = &keyword[0];
269 c = (unsigned char) *field++;
270 if (isspace (c) || c == ':')
271 return ((char *) NULL);
272 *ptr++ = (islower (c) ? toupper (c) : c);
273 while (((c = (unsigned char) *field++) != ':') && ! isspace (c))
274 *ptr++ = (islower (c) ? toupper (c) : c);
275 *ptr++ = '\0';
276 while (isspace (c))
277 c = (unsigned char) *field++;
278 if (c != ':')
279 return ((char *) NULL);
280 *rest = field;
281 return &keyword[0];
284 /* Nonzero if the string FIELD starts with a colon-terminated keyword. */
286 boolean
287 has_keyword (field)
288 char *field;
290 char *ignored;
291 return (get_keyword (field, &ignored) != ((char *) NULL));
294 /* Store the string FIELD, followed by any lines in THE_LIST,
295 into the buffer WHERE.
296 Concatenate lines, putting just a space between them.
297 Delete everything contained in parentheses.
298 When a recipient name contains <...>, we discard
299 everything except what is inside the <...>.
301 We don't pay attention to overflowing WHERE;
302 the caller has to make it big enough. */
304 char *
305 add_field (the_list, field, where)
306 line_list the_list;
307 register char *field, *where;
309 register char c;
310 while (true)
312 char *this_recipient_where;
313 int in_quotes = 0;
315 *where++ = ' ';
316 this_recipient_where = where;
318 while ((c = *field++) != '\0')
320 if (c == '\\')
321 *where++ = c;
322 else if (c == '"')
324 in_quotes = ! in_quotes;
325 *where++ = c;
327 else if (in_quotes)
328 *where++ = c;
329 else if (c == '(')
331 while (*field && *field != ')') ++field;
332 if (! (*field++)) break; /* no close */
333 continue;
335 else if (c == ',')
337 *where++ = ' ';
338 /* When we get to the end of one recipient,
339 don't discard it if the next one has <...>. */
340 this_recipient_where = where;
342 else if (c == '<')
343 /* Discard everything we got before the `<'. */
344 where = this_recipient_where;
345 else if (c == '>')
346 /* Discard the rest of this name that follows the `>'. */
348 while (*field && *field != ',') ++field;
349 if (! (*field++)) break; /* no comma */
350 continue;
352 else
353 *where++ = c;
355 if (the_list == NIL) break;
356 field = the_list->string;
357 the_list = the_list->continuation;
359 return where;
362 line_list
363 make_file_preface ()
365 char *the_string, *temp;
366 long idiotic_interface;
367 struct tm *tm;
368 long prefix_length;
369 long user_length;
370 long date_length;
371 line_list result;
373 prefix_length = strlen (FROM_PREFIX);
374 time (&idiotic_interface);
375 /* Convert to a string, checking for out-of-range time stamps.
376 Don't use 'ctime', as that might dump core if the hardware clock
377 is set to a bizarre value. */
378 tm = localtime (&idiotic_interface);
379 if (! (tm && TM_YEAR_IN_ASCTIME_RANGE (tm->tm_year)
380 && (the_date = asctime (tm))))
381 fatal ("current time is out of range");
382 /* the_date has an unwanted newline at the end */
383 date_length = strlen (the_date) - 1;
384 the_date[date_length] = '\0';
385 temp = cuserid ((char *) NULL);
386 user_length = strlen (temp);
387 the_user = alloc_string (user_length + 1);
388 strcpy (the_user, temp);
389 the_string = alloc_string (3 + prefix_length
390 + user_length
391 + date_length);
392 temp = the_string;
393 strcpy (temp, FROM_PREFIX);
394 temp = &temp[prefix_length];
395 *temp++ = ' ';
396 strcpy (temp, the_user);
397 temp = &temp[user_length];
398 *temp++ = ' ';
399 strcpy (temp, the_date);
400 result = new_list ();
401 result->string = the_string;
402 result->continuation = ((line_list) NULL);
403 return result;
406 void
407 write_line_list (the_list, the_stream)
408 register line_list the_list;
409 FILE *the_stream;
411 for ( ;
412 the_list != ((line_list) NULL) ;
413 the_list = the_list->continuation)
415 fputs (the_list->string, the_stream);
416 putc ('\n', the_stream);
418 return;
422 close_the_streams ()
424 register stream_list rem;
425 for (rem = the_streams;
426 rem != ((stream_list) NULL);
427 rem = rem->rest_streams)
428 no_problems = (no_problems &&
429 ((*rem->action) (rem->handle) == 0));
430 the_streams = ((stream_list) NULL);
431 return (no_problems ? EXIT_SUCCESS : EXIT_FAILURE);
434 void
435 add_a_stream (the_stream, closing_action)
436 FILE *the_stream;
437 int (*closing_action)();
439 stream_list old = the_streams;
440 the_streams = new_stream ();
441 the_streams->handle = the_stream;
442 the_streams->action = closing_action;
443 the_streams->rest_streams = old;
444 return;
448 my_fclose (the_file)
449 FILE *the_file;
451 putc ('\n', the_file);
452 fflush (the_file);
453 return fclose (the_file);
456 boolean
457 open_a_file (name)
458 char *name;
460 FILE *the_stream = fopen (name, "a");
461 if (the_stream != ((FILE *) NULL))
463 add_a_stream (the_stream, my_fclose);
464 if (the_user == ((char *) NULL))
465 file_preface = make_file_preface ();
466 write_line_list (file_preface, the_stream);
467 return true;
469 return false;
472 void
473 put_string (s)
474 char *s;
476 register stream_list rem;
477 for (rem = the_streams;
478 rem != ((stream_list) NULL);
479 rem = rem->rest_streams)
480 fputs (s, rem->handle);
481 return;
484 void
485 put_line (string)
486 char *string;
488 register stream_list rem;
489 for (rem = the_streams;
490 rem != ((stream_list) NULL);
491 rem = rem->rest_streams)
493 char *s = string;
494 int column = 0;
496 /* Divide STRING into lines. */
497 while (*s != 0)
499 char *breakpos;
501 /* Find the last char that fits. */
502 for (breakpos = s; *breakpos && column < 78; ++breakpos)
504 if (*breakpos == '\t')
505 column += 8;
506 else
507 column++;
509 /* If we didn't reach end of line, break the line. */
510 if (*breakpos)
512 /* Back up to just after the last comma that fits. */
513 while (breakpos != s && breakpos[-1] != ',') --breakpos;
515 if (breakpos == s)
517 /* If no comma fits, move past the first address anyway. */
518 while (*breakpos != 0 && *breakpos != ',') ++breakpos;
519 if (*breakpos != 0)
520 /* Include the comma after it. */
521 ++breakpos;
524 /* Output that much, then break the line. */
525 fwrite (s, 1, breakpos - s, rem->handle);
526 column = 8;
528 /* Skip whitespace and prepare to print more addresses. */
529 s = breakpos;
530 while (*s == ' ' || *s == '\t') ++s;
531 if (*s != 0)
532 fputs ("\n\t", rem->handle);
534 putc ('\n', rem->handle);
536 return;
539 #define mail_error error
541 /* Handle an FCC field. FIELD is the text of the first line (after
542 the header name), and THE_LIST holds the continuation lines if any.
543 Call open_a_file for each file. */
545 void
546 setup_files (the_list, field)
547 register line_list the_list;
548 register char *field;
550 register char *start;
551 register char c;
552 while (true)
554 while (((c = *field) != '\0')
555 && (c == ' '
556 || c == '\t'
557 || c == ','))
558 field += 1;
559 if (c != '\0')
561 start = field;
562 while (((c = *field) != '\0')
563 && c != ' '
564 && c != '\t'
565 && c != ',')
566 field += 1;
567 *field = '\0';
568 if (!open_a_file (start))
569 mail_error ("Could not open file %s", start);
570 *field = c;
571 if (c != '\0') continue;
573 if (the_list == ((line_list) NULL))
574 return;
575 field = the_list->string;
576 the_list = the_list->continuation;
580 /* Compute the total size of all recipient names stored in THE_HEADER.
581 The result says how big to make the buffer to pass to parse_header. */
584 args_size (the_header)
585 header the_header;
587 register header old = the_header;
588 register line_list rem;
589 register int size = 0;
592 char *field;
593 register char *keyword = get_keyword (the_header->text->string, &field);
594 if ((strcmp (keyword, "TO") == 0)
595 || (strcmp (keyword, "CC") == 0)
596 || (strcmp (keyword, "BCC") == 0))
598 size += 1 + strlen (field);
599 for (rem = the_header->text->continuation;
600 rem != NIL;
601 rem = rem->continuation)
602 size += 1 + strlen (rem->string);
604 the_header = the_header->next;
605 } while (the_header != old);
606 return size;
609 /* Scan the header described by the lists THE_HEADER,
610 and put all recipient names into the buffer WHERE.
611 Precede each recipient name with a space.
613 Also, if the header has any FCC fields, call setup_files for each one. */
615 void
616 parse_header (the_header, where)
617 header the_header;
618 register char *where;
620 register header old = the_header;
623 char *field;
624 register char *keyword = get_keyword (the_header->text->string, &field);
625 if (strcmp (keyword, "TO") == 0)
626 where = add_field (the_header->text->continuation, field, where);
627 else if (strcmp (keyword, "CC") == 0)
628 where = add_field (the_header->text->continuation, field, where);
629 else if (strcmp (keyword, "BCC") == 0)
631 where = add_field (the_header->text->continuation, field, where);
632 the_header->previous->next = the_header->next;
633 the_header->next->previous = the_header->previous;
635 else if (strcmp (keyword, "FCC") == 0)
636 setup_files (the_header->text->continuation, field);
637 the_header = the_header->next;
638 } while (the_header != old);
639 *where = '\0';
640 return;
643 /* Read lines from the input until we get a blank line.
644 Create a list of `header' objects, one for each header field,
645 each of which points to a list of `line_list' objects,
646 one for each line in that field.
647 Continuation lines are grouped in the headers they continue. */
649 header
650 read_header ()
652 register header the_header = ((header) NULL);
653 register line_list *next_line = ((line_list *) NULL);
655 init_linebuffer (&lb);
659 long length;
660 register char *line;
662 readline (&lb, stdin);
663 line = lb.buffer;
664 length = strlen (line);
665 if (length == 0) break;
667 if (has_keyword (line))
669 register header old = the_header;
670 the_header = new_header ();
671 if (old == ((header) NULL))
673 the_header->next = the_header;
674 the_header->previous = the_header;
676 else
678 the_header->previous = old;
679 the_header->next = old->next;
680 old->next = the_header;
682 next_line = &(the_header->text);
685 if (next_line == ((line_list *) NULL))
687 /* Not a valid header */
688 exit (EXIT_FAILURE);
690 *next_line = new_list ();
691 (*next_line)->string = alloc_string (length);
692 strcpy (((*next_line)->string), line);
693 next_line = &((*next_line)->continuation);
694 *next_line = NIL;
696 } while (true);
698 if (! the_header)
699 fatal ("input message has no header");
700 return the_header->next;
703 void
704 write_header (the_header)
705 header the_header;
707 register header old = the_header;
710 register line_list the_list;
711 for (the_list = the_header->text;
712 the_list != NIL;
713 the_list = the_list->continuation)
714 put_line (the_list->string);
715 the_header = the_header->next;
716 } while (the_header != old);
717 put_line ("");
718 return;
722 main (argc, argv)
723 int argc;
724 char **argv;
726 char *command_line;
727 header the_header;
728 long name_length;
729 char *mail_program_name;
730 char buf[BUFLEN + 1];
731 register int size;
732 FILE *the_pipe;
734 extern char *getenv ();
736 mail_program_name = getenv ("FAKEMAILER");
737 if (!(mail_program_name && *mail_program_name))
738 mail_program_name = MAIL_PROGRAM_NAME;
739 name_length = strlen (mail_program_name);
741 my_name = MY_NAME;
742 the_streams = ((stream_list) NULL);
743 the_date = ((char *) NULL);
744 the_user = ((char *) NULL);
746 the_header = read_header ();
747 command_line = alloc_string (name_length + args_size (the_header));
748 strcpy (command_line, mail_program_name);
749 parse_header (the_header, &command_line[name_length]);
751 the_pipe = popen (command_line, "w");
752 if (the_pipe == ((FILE *) NULL))
753 fatal ("cannot open pipe to real mailer");
755 add_a_stream (the_pipe, pclose);
757 write_header (the_header);
759 /* Dump the message itself */
761 while (!feof (stdin))
763 size = fread (buf, 1, BUFLEN, stdin);
764 buf[size] = '\0';
765 put_string (buf);
768 exit (close_the_streams ());
771 #endif /* not MSDOS */
772 #endif /* not BSD 4.2 (or newer) */
774 /* arch-tag: acb0afa6-315a-4c5b-b9e3-def5725c8783
775 (do not change this comment) */
777 /* fakemail.c ends here */