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Annotation of 43BSDReno/contrib/emacs-18.55/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 distributed in the hope that it will be useful,
        !             7: but WITHOUT ANY WARRANTY.  No author or distributor
        !             8: accepts responsibility to anyone for the consequences of using it
        !             9: or for whether it serves any particular purpose or works at all,
        !            10: unless he says so in writing.  Refer to the GNU Emacs General Public
        !            11: License for full details.
        !            12: 
        !            13: Everyone is granted permission to copy, modify and redistribute
        !            14: GNU Emacs, but only under the conditions described in the
        !            15: GNU Emacs General Public License.   A copy of this license is
        !            16: supposed to have been given to you along with GNU Emacs so you
        !            17: can know your rights and responsibilities.  It should be in a
        !            18: file named COPYING.  Among other things, the copyright notice
        !            19: and this notice must be preserved on all copies.  */
        !            20: 
        !            21: 
        !            22: #define NO_SHORTNAMES
        !            23: #include "../src/config.h"
        !            24: 
        !            25: #if defined (BSD) && !defined (BSD4_1)
        !            26: /* This program isnot used in BSD, so just avoid loader complaints.  */
        !            27: main ()
        !            28: {
        !            29: }
        !            30: #else /* not BSD 4.2 (or newer) */
        !            31: /* This conditional contains all the rest of the file.  */
        !            32: 
        !            33: /* These are defined in config in some versions. */
        !            34: 
        !            35: #ifdef static
        !            36: #undef static
        !            37: #endif
        !            38: 
        !            39: #ifdef read
        !            40: #undef read
        !            41: #undef write
        !            42: #undef open
        !            43: #undef close
        !            44: #endif
        !            45: 
        !            46: #include <stdio.h>
        !            47: #include <string.h>
        !            48: #include <ctype.h>
        !            49: #include <time.h>
        !            50: #include <pwd.h>
        !            51: 
        !            52: /* Type definitions */
        !            53: 
        !            54: #define boolean int
        !            55: #define true 1
        !            56: #define false 0
        !            57: 
        !            58: /* Various lists */
        !            59: 
        !            60: struct line_record
        !            61: {
        !            62:   char *string;
        !            63:   struct line_record *continuation;
        !            64: };
        !            65: typedef struct line_record *line_list;
        !            66: 
        !            67: struct header_record
        !            68: {
        !            69:   line_list text;
        !            70:   struct header_record *next;
        !            71:   struct header_record *previous;
        !            72: };
        !            73: typedef struct header_record *header;
        !            74:                        
        !            75: struct stream_record
        !            76: {
        !            77:   FILE *handle;
        !            78:   int (*action)();
        !            79:   struct stream_record *rest_streams;
        !            80: };
        !            81: typedef struct stream_record *stream_list;
        !            82: 
        !            83: /* A `struct linebuffer' is a structure which holds a line of text.
        !            84:  * `readline' reads a line from a stream into a linebuffer
        !            85:  * and works regardless of the length of the line.
        !            86:  */
        !            87: 
        !            88: struct linebuffer
        !            89: {
        !            90:   long size;
        !            91:   char *buffer;
        !            92: };
        !            93: 
        !            94: struct linebuffer lb;
        !            95: 
        !            96: #define new_list()                                     \
        !            97:   ((line_list) xmalloc (sizeof (struct line_record)))
        !            98: #define new_header()                           \
        !            99:   ((header) xmalloc (sizeof (struct header_record)))
        !           100: #define new_stream()                           \
        !           101:   ((stream_list) xmalloc (sizeof (struct stream_record)))
        !           102: #define alloc_string(nchars)                           \
        !           103:   ((char *) xmalloc ((nchars) + 1))
        !           104: 
        !           105: /* Global declarations */
        !           106: 
        !           107: #define BUFLEN 1024
        !           108: #define KEYWORD_SIZE 256
        !           109: #define FROM_PREFIX "From"
        !           110: #define MY_NAME "fakemail"
        !           111: #define NIL ((line_list) NULL)
        !           112: #define INITIAL_LINE_SIZE 200
        !           113: 
        !           114: #ifndef MAIL_PROGRAM_NAME
        !           115: #define MAIL_PROGRAM_NAME "/bin/mail"
        !           116: #endif
        !           117: 
        !           118: static char *my_name;
        !           119: static char *the_date;
        !           120: static char *the_user;
        !           121: static line_list file_preface;
        !           122: static stream_list the_streams;
        !           123: static boolean no_problems = true;
        !           124: 
        !           125: extern FILE *popen ();
        !           126: extern int fclose (), pclose ();
        !           127: extern char *malloc (), *realloc ();
        !           128: 
        !           129: #ifdef CURRENT_USER
        !           130: extern struct passwd *getpwuid ();
        !           131: extern unsigned short geteuid ();
        !           132: static struct passwd *my_entry;
        !           133: #define cuserid(s)                             \
        !           134: (my_entry = getpwuid (((int) geteuid ())),     \
        !           135:  my_entry->pw_name)
        !           136: #endif
        !           137: 
        !           138: /* Utilities */
        !           139: 
        !           140: /* Print error message.  `s1' is printf control string, `s2' is arg for it. */
        !           141: 
        !           142: static void
        !           143: error (s1, s2)
        !           144:      char *s1, *s2;
        !           145: {
        !           146:   printf ("%s: ", my_name);
        !           147:   printf (s1, s2);
        !           148:   printf ("\n");
        !           149:   no_problems = false;
        !           150: }
        !           151: 
        !           152: /* Print error message and exit.  */
        !           153: 
        !           154: static void
        !           155: fatal (s1, s2)
        !           156:      char *s1, *s2;
        !           157: {
        !           158:   error (s1, s2);
        !           159:   exit (1);
        !           160: }
        !           161: 
        !           162: /* Like malloc but get fatal error if memory is exhausted.  */
        !           163: 
        !           164: static char *
        !           165: xmalloc (size)
        !           166:      int size;
        !           167: {
        !           168:   char *result = malloc (((unsigned) size));
        !           169:   if (result == ((char *) NULL))
        !           170:     fatal ("virtual memory exhausted", 0);
        !           171:   return result;
        !           172: }
        !           173: 
        !           174: static char *
        !           175: xrealloc (ptr, size)
        !           176:      char *ptr;
        !           177:      int size;
        !           178: {
        !           179:   char *result = realloc (ptr, ((unsigned) size));
        !           180:   if (result == ((char *) NULL))
        !           181:     fatal ("virtual memory exhausted");
        !           182:   return result;
        !           183: }
        !           184: 
        !           185: /* Initialize a linebuffer for use */
        !           186: 
        !           187: void
        !           188: init_linebuffer (linebuffer)
        !           189:      struct linebuffer *linebuffer;
        !           190: {
        !           191:   linebuffer->size = INITIAL_LINE_SIZE;
        !           192:   linebuffer->buffer = ((char *) xmalloc (INITIAL_LINE_SIZE));
        !           193: }
        !           194: 
        !           195: /* Read a line of text from `stream' into `linebuffer'.
        !           196:  * Return the length of the line.  
        !           197:  */
        !           198: 
        !           199: long
        !           200: readline (linebuffer, stream)
        !           201:      struct linebuffer *linebuffer;
        !           202:      FILE *stream;
        !           203: {
        !           204:   char *buffer = linebuffer->buffer;
        !           205:   char *p = linebuffer->buffer;
        !           206:   char *end = p + linebuffer->size;
        !           207: 
        !           208:   while (true)
        !           209:     {
        !           210:       int c = getc (stream);
        !           211:       if (p == end)
        !           212:        {
        !           213:          linebuffer->size *= 2;
        !           214:          buffer = ((char *) xrealloc (buffer, linebuffer->size));
        !           215:          p += buffer - linebuffer->buffer;
        !           216:          end += buffer - linebuffer->buffer;
        !           217:          linebuffer->buffer = buffer;
        !           218:        }
        !           219:       if (c < 0 || c == '\n')
        !           220:        {
        !           221:          *p = 0;
        !           222:          break;
        !           223:        }
        !           224:       *p++ = c;
        !           225:     }
        !           226: 
        !           227:   return p - buffer;
        !           228: }
        !           229: 
        !           230: char *
        !           231: get_keyword (field, rest)
        !           232:      register char *field;
        !           233:      char **rest;
        !           234: {
        !           235:   static char keyword[KEYWORD_SIZE];
        !           236:   register char *ptr;
        !           237:   register char c;
        !           238: 
        !           239:   ptr = &keyword[0];
        !           240:   c = *field++;
        !           241:   if ((isspace (c)) || (c == ':'))
        !           242:     return ((char *) NULL);
        !           243:   *ptr++ = ((islower (c)) ? (toupper (c)) : c);
        !           244:   while (((c = *field++) != ':') && (!(isspace (c))))
        !           245:     *ptr++ = ((islower (c)) ? (toupper (c)) : c);
        !           246:   *ptr++ = '\0';
        !           247:   while (isspace (c)) c = *field++;
        !           248:   if (c != ':') return ((char *) NULL);
        !           249:   *rest = field;
        !           250:   return &keyword[0];
        !           251: }
        !           252: 
        !           253: boolean
        !           254: has_keyword (field)
        !           255:      char *field;
        !           256: {
        !           257:   char *ignored;
        !           258:   return (get_keyword (field, &ignored) != ((char *) NULL));
        !           259: }
        !           260: 
        !           261: char *
        !           262: add_field (the_list, field, where)
        !           263:      line_list the_list;
        !           264:      register char *field, *where;
        !           265: {
        !           266:   register char c;
        !           267:   while (true)
        !           268:     {
        !           269:       *where++ = ' ';
        !           270:       while ((c = *field++) != '\0')
        !           271:        *where++ = ((c == ',') ? ' ' : c);
        !           272:       if (the_list == NIL) break;
        !           273:       field = the_list->string;
        !           274:       the_list = the_list->continuation;
        !           275:     }
        !           276:   return where;
        !           277: }
        !           278: 
        !           279: line_list
        !           280: make_file_preface ()
        !           281: {
        !           282:   char *the_string, *temp;
        !           283:   long idiotic_interface;
        !           284:   long prefix_length;
        !           285:   long user_length;
        !           286:   long date_length;
        !           287:   line_list result;
        !           288: 
        !           289:   prefix_length = strlen (FROM_PREFIX);
        !           290:   time (&idiotic_interface);
        !           291:   the_date = ctime (&idiotic_interface);
        !           292:   /* the_date has an unwanted newline at the end */
        !           293:   date_length = strlen (the_date) - 1;
        !           294:   the_date[date_length] = '\0';
        !           295:   temp = cuserid ((char *) NULL);
        !           296:   user_length = strlen (temp);
        !           297:   the_user = alloc_string (user_length + 1);
        !           298:   strcpy (the_user, temp);
        !           299:   the_string = alloc_string (3 + prefix_length +
        !           300:                             user_length +
        !           301:                             date_length);
        !           302:   temp = the_string;
        !           303:   strcpy (temp, FROM_PREFIX);
        !           304:   temp = &temp[prefix_length];
        !           305:   *temp++ = ' ';
        !           306:   strcpy (temp, the_user);
        !           307:   temp = &temp[user_length];
        !           308:   *temp++ = ' ';
        !           309:   strcpy (temp, the_date);
        !           310:   result = new_list ();
        !           311:   result->string = the_string;
        !           312:   result->continuation = ((line_list) NULL);
        !           313:   return result;
        !           314: }
        !           315: 
        !           316: void
        !           317: write_line_list (the_list, the_stream)
        !           318:      register line_list the_list;
        !           319:      FILE *the_stream;
        !           320: {
        !           321:   for ( ;
        !           322:       the_list != ((line_list) NULL) ;
        !           323:       the_list = the_list->continuation)
        !           324:     {
        !           325:       fputs (the_list->string, the_stream);
        !           326:       putc ('\n', the_stream);
        !           327:     }
        !           328:   return;
        !           329: }
        !           330: 
        !           331: int
        !           332: close_the_streams ()
        !           333: {
        !           334:   register stream_list rem;
        !           335:   for (rem = the_streams;
        !           336:        rem != ((stream_list) NULL);
        !           337:        rem = rem->rest_streams)
        !           338:     no_problems = (no_problems &&
        !           339:                   ((*rem->action) (rem->handle) == 0));
        !           340:   the_streams = ((stream_list) NULL);
        !           341:   return (no_problems ? 0 : 1);
        !           342: }
        !           343: 
        !           344: void
        !           345: add_a_stream (the_stream, closing_action)
        !           346:      FILE *the_stream;
        !           347:      int (*closing_action)();
        !           348: {
        !           349:   stream_list old = the_streams;
        !           350:   the_streams = new_stream ();
        !           351:   the_streams->handle = the_stream;
        !           352:   the_streams->action = closing_action;
        !           353:   the_streams->rest_streams = old;
        !           354:   return;
        !           355: }
        !           356: 
        !           357: int
        !           358: my_fclose (the_file)
        !           359:      FILE *the_file;
        !           360: {
        !           361:   putc ('\n', the_file);
        !           362:   fflush (the_file);
        !           363:   return fclose (the_file);
        !           364: }
        !           365: 
        !           366: boolean
        !           367: open_a_file (name)
        !           368:      char *name;
        !           369: {
        !           370:   FILE *the_stream = fopen (name, "a");
        !           371:   if (the_stream != ((FILE *) NULL))
        !           372:     {
        !           373:       add_a_stream (the_stream, my_fclose);
        !           374:       if (the_user == ((char *) NULL))
        !           375:        file_preface = make_file_preface ();
        !           376:       write_line_list (file_preface, the_stream);
        !           377:       return true;
        !           378:     }
        !           379:   return false;
        !           380: }
        !           381: 
        !           382: void
        !           383: put_string (s)
        !           384:      char *s;
        !           385: {
        !           386:   register stream_list rem;
        !           387:   for (rem = the_streams;
        !           388:        rem != ((stream_list) NULL);
        !           389:        rem = rem->rest_streams)
        !           390:     fputs (s, rem->handle);
        !           391:   return;
        !           392: }
        !           393: 
        !           394: void
        !           395: put_line (s)
        !           396:      char *s;
        !           397: {
        !           398:   register stream_list rem;
        !           399:   for (rem = the_streams;
        !           400:        rem != ((stream_list) NULL);
        !           401:        rem = rem->rest_streams)
        !           402:     {
        !           403:       fputs (s, rem->handle);
        !           404:       putc ('\n', rem->handle);
        !           405:     }
        !           406:   return;
        !           407: }
        !           408: 
        !           409: #define mail_error error
        !           410: 
        !           411: void
        !           412: setup_files (the_list, field)
        !           413:      register line_list the_list;
        !           414:      register char *field;
        !           415: {
        !           416:   register char *start;
        !           417:   register char c;
        !           418:   while (true)
        !           419:     {
        !           420:       while (((c = *field) != '\0') &&
        !           421:             ((c == ' ') ||
        !           422:              (c == '\t') ||
        !           423:              (c == ',')))
        !           424:        field += 1;
        !           425:       if (c != '\0')
        !           426:        {
        !           427:          start = field;
        !           428:          while (((c = *field) != '\0') &&
        !           429:                 (c != ' ') &&
        !           430:                 (c != '\t') &&
        !           431:                 (c != ','))
        !           432:            field += 1;
        !           433:          *field = '\0';
        !           434:          if (!open_a_file (start))
        !           435:            mail_error ("Could not open file %s", start);
        !           436:          *field = c;
        !           437:          if (c != '\0') continue;
        !           438:        }
        !           439:       if (the_list == ((line_list) NULL)) return;
        !           440:       field = the_list->string;
        !           441:       the_list = the_list->continuation;
        !           442:     }
        !           443: }
        !           444: 
        !           445: int
        !           446: args_size (the_header)
        !           447:      header the_header;
        !           448: {
        !           449:   register header old = the_header;
        !           450:   register line_list rem;
        !           451:   register int size = 0;
        !           452:   do
        !           453:     {
        !           454:       char *field;
        !           455:       register char *keyword = get_keyword (the_header->text->string, &field);
        !           456:       if ((strcmp (keyword, "TO") == 0) ||
        !           457:          (strcmp (keyword, "CC") == 0) ||
        !           458:          (strcmp (keyword, "BCC") == 0))
        !           459:        {
        !           460:          size += 1 + strlen (field);
        !           461:          for (rem = the_header->text->continuation;
        !           462:               rem != NIL;
        !           463:               rem = rem->continuation)
        !           464:            size += 1 + strlen (rem->string);
        !           465:        }
        !           466:       the_header = the_header->next;
        !           467:     } while (the_header != old);
        !           468:   return size;
        !           469: }
        !           470: 
        !           471: parse_header (the_header, where)
        !           472:      header the_header;
        !           473:      register char *where;
        !           474: {
        !           475:   register header old = the_header;
        !           476:   do
        !           477:     {
        !           478:       char *field;
        !           479:       register char *keyword = get_keyword (the_header->text->string, &field);
        !           480:       if (strcmp (keyword, "TO") == 0)
        !           481:        where = add_field (the_header->text->continuation, field, where);
        !           482:       else if (strcmp (keyword, "CC") == 0)
        !           483:        where = add_field (the_header->text->continuation, field, where);
        !           484:       else if (strcmp (keyword, "BCC") == 0)
        !           485:        {
        !           486:          where = add_field (the_header->text->continuation, field, where);
        !           487:          the_header->previous->next = the_header->next;
        !           488:          the_header->next->previous = the_header->previous;
        !           489:        }
        !           490:       else if (strcmp (keyword, "FCC") == 0)
        !           491:        setup_files (the_header->text->continuation, field);
        !           492:       the_header = the_header->next;
        !           493:     } while (the_header != old);
        !           494:   *where = '\0';
        !           495:   return;
        !           496: }
        !           497:     
        !           498: header
        !           499: read_header ()
        !           500: {
        !           501:   register header the_header = ((header) NULL);
        !           502:   register line_list *next_line = ((line_list *) NULL);
        !           503: 
        !           504:   init_linebuffer (&lb);
        !           505: 
        !           506:   do
        !           507:     {
        !           508:       long length;
        !           509:       register char *line;
        !           510: 
        !           511:       readline (&lb, stdin);
        !           512:       line = lb.buffer;
        !           513:       length = strlen (line);
        !           514:       if (length == 0) break;
        !           515: 
        !           516:       if (has_keyword (line))
        !           517:        {
        !           518:          register header old = the_header;
        !           519:          the_header = new_header ();
        !           520:          if (old == ((header) NULL))
        !           521:            {
        !           522:              the_header->next = the_header;
        !           523:              the_header->previous = the_header;
        !           524:            }
        !           525:          else
        !           526:            {
        !           527:              the_header->previous = old;
        !           528:              the_header->next = old->next;
        !           529:              old->next = the_header;
        !           530:            }
        !           531:          next_line = &(the_header->text);
        !           532:        }
        !           533: 
        !           534:       if (next_line == ((line_list *) NULL))
        !           535:        {
        !           536:          /* Not a valid header */
        !           537:          exit (1);
        !           538:        }
        !           539:       *next_line = new_list ();
        !           540:       (*next_line)->string = alloc_string (length);
        !           541:       strcpy (((*next_line)->string), line);
        !           542:       next_line = &((*next_line)->continuation);
        !           543:       *next_line = NIL;
        !           544: 
        !           545:     } while (true);
        !           546: 
        !           547:   return the_header->next;
        !           548: }
        !           549: 
        !           550: void
        !           551: write_header (the_header)
        !           552:      header the_header;
        !           553: {
        !           554:   register header old = the_header;
        !           555:   do
        !           556:     {
        !           557:       register line_list the_list;
        !           558:       for (the_list = the_header->text;
        !           559:           the_list != NIL;
        !           560:           the_list = the_list->continuation)
        !           561:        put_line (the_list->string);
        !           562:       the_header = the_header->next;
        !           563:     } while (the_header != old);
        !           564:   put_line ("");
        !           565:   return;
        !           566: }
        !           567: 
        !           568: void
        !           569: main (argc, argv)
        !           570:      int argc;
        !           571:      char **argv;
        !           572: {
        !           573:   char *command_line;
        !           574:   header the_header;
        !           575:   long name_length = strlen (MAIL_PROGRAM_NAME);
        !           576:   char buf[BUFLEN + 1];
        !           577:   register int size;
        !           578:   FILE *the_pipe;
        !           579: 
        !           580:   my_name = MY_NAME;
        !           581:   the_streams = ((stream_list) NULL);
        !           582:   the_date = ((char *) NULL);
        !           583:   the_user = ((char *) NULL);
        !           584: 
        !           585:   the_header = read_header ();
        !           586:   command_line = alloc_string (name_length + args_size (the_header));
        !           587:   strcpy (command_line, MAIL_PROGRAM_NAME);
        !           588:   parse_header (the_header, &command_line[name_length]);
        !           589:   
        !           590:   the_pipe = popen (command_line, "w");
        !           591:   if (the_pipe == ((FILE *) NULL))
        !           592:     fatal ("cannot open pipe to real mailer");
        !           593: 
        !           594:   add_a_stream (the_pipe, pclose);
        !           595: 
        !           596:   write_header (the_header);
        !           597: 
        !           598:   /* Dump the message itself */
        !           599: 
        !           600:   while (!feof (stdin))
        !           601:     {
        !           602:       size = fread (buf, 1, BUFLEN, stdin);
        !           603:       buf[size] = '\0';
        !           604:       put_string (buf);
        !           605:     }
        !           606: 
        !           607:   exit (close_the_streams ());
        !           608: }
        !           609: 
        !           610: #endif /* not BSD 4.2 (or newer) */

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