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Annotation of GNUtools/emacs/etc/fakemail.c, revision 1.1

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

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