File: sendmail.c

package info (click to toggle)
mh 6.8.4-28
  • links: PTS
  • area: main
  • in suites: slink
  • size: 7,012 kB
  • ctags: 7,496
  • sloc: ansic: 75,211; sh: 3,112; lisp: 2,205; ml: 1,894; makefile: 724; perl: 482; csh: 150; tcl: 66; sed: 43; awk: 7
file content (575 lines) | stat: -rw-r--r-- 13,734 bytes parent folder | download | duplicates (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
/* sendmail.c - */
#ifndef	lint
static char Id[] = "$Id: sendmail.c,v 1.9 1992/11/24 18:37:01 jromine Exp $";
#endif
/*
 **  A Sendmail fake.
 *
 * Contributed by Scott Erickson <erickson@ics.uci.edu>
 */
/* Include files glommed from post.c */

#include "../h/mh.h"
#include "../h/addrsbr.h"
#include "../h/aliasbr.h"
#include "../h/dropsbr.h"
#include "../zotnet/tws.h"
#ifndef MMDFMTS
#include <ctype.h>
#include <errno.h>
#include <setjmp.h>
#include <stdio.h>
#include <sys/types.h>
#else   MMDFMTS
#include "../mts/mmdf/util.h"
#include "../mts/mmdf/mmdf.h"
#endif  MMDFMTS
#include "../zotnet/mts.h"
#ifdef  MHMTS
#ifndef V7
#include <sys/ioctl.h>
#endif  not V7
#include <sys/stat.h>
#endif  MHMTS
#ifdef  SENDMTS
#include "../mts/sendmail/smail.h"
#undef  MF
#endif  SENDMTS
#include <signal.h>
#ifdef LOCALE
#include	<locale.h>
#endif

char	*SMTPSRVR = "smtpsrvr";

char	msgfname[50];	/* name of message file */
char	*FullName;	/* sender's full name */
char	*from;		/* sender's mail address */
int	verbose;
int	verify;
int	extract;
int	dodist;
int	rewritefrom;
int	status;		/* return value from procedures */
static int childid;	/* id from smtp child process */
TYPESIG	die();
long	lclock = 0L;	/* the time we started (more or less) */


FILE *fp;		/* file pointer for message file */
extern FILE *tmpfile();

static struct swit switches[] = {
#define ARPASW    0
    "ba", -2,
#define DAEMONSW  1
    "bd", -2,
#define INITALSW  2
    "bi", -2,
#define DELIVSW   3
    "bm", -2,
#define QSUMSW    4
    "bp", -2,
#define SMTPSW    5
    "bs", -2,
#define ADRTSTSW  6
    "bt", -2,
#define ADRVRFSW  7
    "bv", -2,
#define CFGFRZSW  8
    "bz", -2,
#define ALTCFGSW  9
    "C", -1,
#define DBGVALSW 10
    "d", -1,
#define FULLSW   11
    "F", -1,
#define FROMSW   12
    "f", -1,
#define HOPCNTSW 13
    "h", -1,
#define MSGIDSW  14
    "M", -1,
#define NOALISW  15
    "n", -1,
#define QTIMESW  16
    "q", -1,
#define OBSFRMSW 17
    "r", -1,
#define EXTHDRSW 18
    "t", -1,
#define VERBSW	 19
    "v", -1,
#define ALTALISW 20
    "oA", -2,
#define NOCONSW   21
    "oc", -2,
#define DLVMODSW 22
    "od", -2,
#define NEWALISW 23
    "oD", -2,
#define ERRMODSW 24
    "oe", -2,
#define TMPMODSW 25
    "oF", -2,
#define UFROMSW  26
    "of", -2,
#define GIDSW    27
    "og", -2,
#define HLPFILSW 28
    "oH", -2,
#define NODOTSW  29
    "oi", -2,
#define LOGLEVSW 30
    "oL", -2,
#define MEOKSW   31
    "om", -2,
#define OLDHDRSW 32
    "oo", -2,
#define QDIRSW   33
    "oQ", -2,
#define RTMOUTSW 34
    "or", -2,
#define SFILESW  35
    "oS", -2,
#define QMSGSW   36
    "os", -2,
#define MTMOUTSW 37
    "oT", -2,
#define TZSW     38
    "ot", -2,
#define UIDSW    39
    "ou", -2,
    
    NULL, 0
    };

#if !defined(POSIX) && !defined(_POSIX_SOURCE)
extern char *mktemp();
#endif

static void removemsg();
static int  isheader(), sendfile();

/*ARGSUSED*/
main (argc, argv)
int    argc;
char **argv;
{
    register char *cp;
    char **argp = argv + 1;
    
#ifdef LOCALE
	setlocale(LC_ALL, "");
#endif
    invo_name = r1bindex (argv[0], '/');
    mts_init(argv[0]);
    
    if (signal(SIGINT, SIG_IGN) != SIG_IGN)
	(void) signal(SIGINT, die);
    if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
	(void) signal(SIGHUP, die);
    (void) signal(SIGTERM, die);
    (void) signal(SIGPIPE, die);
    
    FullName = getfullname();
    from = adrsprintf(NULLCP,NULLCP);
    (void) time (&lclock);
    
    while ( (cp = *argp) &&  *cp == '-' ) {
	argp++;
	switch (smatch ( ++cp, switches )) {
	case ARPASW:	/* smtp on stdin */
	case SMTPSW:	/* smtp on stdin */
	    smtp();
	    exit(98);	/* should never happen */
	    
	case DELIVSW:	/* just send mail */
	    continue;
	    
	case ADRVRFSW:	/* verify mode */
	    verify = 1;
	    continue;
	    
	case FROMSW:	/* from address */
	case OBSFRMSW:	/* obsolete -f flag */
	    if (*(++cp) == '\0' &&
		(!(cp = *argp++) || *cp == '-'))
		adios (NULLCP, "missing argument to %s", argp[-2]);
	    /* At this point, cp points to the from name */
	    if (rewritefrom) {
		adios (NULLCP, "More than one \"from\" person");
		continue;
	    }
	    from = cp;
	    rewritefrom = 1;
	    continue;
	    
	case EXTHDRSW:	/* read recipients from message */
	    extract = 1;
	    continue;
	    
	case VERBSW:	/* give blow-by-blow description */
	    verbose = 1;
	    continue;
	    
	    /* These switches have no args. */
	case QMSGSW:	/* always queue the message */
	case DAEMONSW:	/* run as a daemon & wait for SMTP */
	case INITALSW:	/* initialize the alias database */
	case QSUMSW:	/* print summary of mail queue */
	case ADRTSTSW:	/* test the addresses to debug config file */
	case CFGFRZSW:	/* create the configuration freeze file */
	case NOALISW:	/* do not do aliasing */
	case NOCONSW:	/* do not initiate immediate host connection */
	case NEWALISW:	/* run newaliases to rebuild db */
	case UFROMSW:	/* save UNIX-style From lines at front of msg*/
	case NODOTSW:	/* dots on line are not msg terminators */
	case MEOKSW:	/* ok to send to me if I'm in an alias */
	case OLDHDRSW:	/* msg may have old-style headers */
	    continue;
	    
	    /* These switches have string args. */
	case ALTALISW:	/* use alternate alias file */
	case ALTCFGSW:	/* use alternate configuration file */
	case DBGVALSW:	/* set the debug value */
	case FULLSW:	/* set full name */
	case MSGIDSW:	/* try to deliver queued msg with msg-id */
	case QTIMESW:	/* interval between queue passes */
	case DLVMODSW:	/* set the delivery mode */
	case ERRMODSW:	/* set the error mode */
	case TMPMODSW:	/* the mode to use when creating tmp files */
	case HLPFILSW:	/* the SMTP help file */
	case QDIRSW:	/* directory into which to queue messages */
	case RTMOUTSW:	/* timeout on reads */
	case SFILESW:	/* save statistics in this file */
	case MTMOUTSW:	/* timeout on messages in the queue */
	case TZSW:	/* set the name of the timezone */
	    if (*(++cp) == '\0' &&
		(!(cp = *argp++) || *cp == '-'))
		adios (NULLCP, "missing argument to %s", argp[-2]);
	    /* At this point, cp points to the argument */
	    continue;	/* Ignore */
	    
	    /* These switches have numeric args. */
	case HOPCNTSW:	/* hop count */
	case GIDSW:	/* gid when calling mailers */
	case LOGLEVSW:	/* the log level */
	case UIDSW:	/* uid when calling mailers */
	    if (*(++cp) == '\0' &&
		(!(cp = *argp++) || *cp == '-'))
		adios (NULLCP, "missing argument to %s", argp[-2]);
	    /* At this point, cp points to the numeric arg */
	    if (!isdigit(*cp))
		adios (NULLCP, "non-numeric argument to %s", argp[-2]);
	    continue;	/* Ignore */
	}
    }
    
    (void) setuid(getuid());
    
    if (verify && extract)
	adios (NULLCP, "mode not supported on header components");
    
    if (*argp == NULL && !extract)
	adios (NULLCP, "usage: /usr/sbin/sendmail [flags] addr...");
    
    strcpy (msgfname, "/tmp/sendmhXXXXXX");
    if ( mktemp(msgfname) == NULL )
	adios (msgfname, "can't create msg file ");
    
    if ( (fp = fopen(msgfname,"w") ) == NULL ) {
	adios (msgfname, "error opening ");
    }
    
    doheader(argp);
    if ( verify ) {
	(void) fclose(fp);
	status = doverify();
	removemsg();
	exit ( status ) ;
    }
    dobody();
    status = sendfile();
    removemsg();
    exit ( status );
}

static void removemsg()
{
  if ( unlink(msgfname) != 0 )
      perror("unlink");
}

doheader(argp)
char **argp;
{
    char	line[BUFSIZ];
    int		gotdate, gotfrom, gotsender, gotto;
    
    /* if we're not extracting the headers from the message, then we
     * need to check to see if we need to do a "send" or a "dist".
     */
    
    if ( !extract ) {
	/* If we're doing a verify, just create a "To:" header. */
	if ( ! verify ) {
	    gotdate = gotfrom = gotto = gotsender = dodist = 0;
	    while (fgets (line, BUFSIZ, stdin) != NULL) {
		if (line[0] == '\n')		/* end of header */
		    break;
		if ( !isheader(line) )
		    break;

		/* if any of the following headers are present, then we
		 * want to do a dist.
		 */
		if ( !gotdate && uprf(line, "date") )
		    gotdate = dodist = 1;

		else if ( !gotto && (uprf(line, "to") || uprf(line, "cc")) )
		    gotto = dodist = 1;

		else if ( uprf(line, "message-id") )
		    dodist = 1;

		else if ( !gotsender && uprf(line, "sender") )
		    gotsender = dodist = 1;
		
		else if ( uprf ( line, "resent-" ) ) {
		    dodist = 1;
		    (void) fputs("Prev-", fp);
		}
		
		/* See if we are re-writing the from line */
		if ( uprf(line, "from") ) {
		    gotfrom = 1;
		    if ( rewritefrom )
			dofrom();
		    else
			(void) fputs(line,fp);
		}
		else
		    (void) fputs(line,fp);
	    }
	}
	/* Now, generate a "to" line.  The first line is easy.
	 * Write the rest of the lines with a newline/tab so that we
	 * don't accidentally write a line that's too long to be parsed
	 * by post.
	 */
	(void) fprintf (fp, "%sTo: %s", (dodist ? "Resent-" : "" ), *argp++);
	while ( *argp )
	    (void) fprintf ( fp, ",\n\t%s", *argp++ );
	(void) fputs("\n",fp);

	/* If we're doing a dist, we must have a "Date:" and "From:" field.
	 */
	if ( dodist ) {
	    if ( !gotdate )
		(void) fprintf (fp, "Date: %s\n", dtime (&lclock));
	    if ( !gotfrom )
		dofrom();
	}
#ifdef	MMDFI			/* sigh */
	if ( !gotsender )
	    (void) fprintf (fp, "Sender: %s\n", from);
#endif	MMDFI
    } else {	/* we're verifying, so just pass everything through */
	while (fgets (line, BUFSIZ, stdin) != NULL) {
	    if (line[0] == '\n')		/* end of header */
		break;
	    
	    if ( rewritefrom && uprf(line, "from"))
		dofrom();
	    else
		(void) fputs(line,fp);
	}
    }
    /* At this point, line is either a newline (end of header) or the
     * first line of the body (poorly formatted message).  If line
     * contains a line of body from a poorly formatted message, then
     * print a newline to separate the header correctly, then print
     * the body line.
     */
    if ( line[0] != '\n' )	/* i.e. a "body" line */
	(void) fputc('\n', fp);
    (void) fputs(line, fp);
}

static int isheader(s)
char *s;
{
    register char *cp;

    /* If the first character is a space, assume a continuation of a header */
    if ( isspace(*s) )
	return 1;

    /* If there's no ':', it's not a header */
    if ( (cp = index(s,':')) == NULL )
	return 0;

    /* If there's a space between BOL and ':', it's not a header */
    while ( s < cp ) {
	if ( isspace(*s) )
	    return 0;
	s++;
    }
    return 1;
}

/* This procedure does the verify and returns the status */
doverify() {
    char *command, buf[BUFSIZ], *bp;
    FILE *verfp, *popen();
    
    /* set up the command line for post */
    if ( (command = (char *)malloc((strlen(postproc) +
				    strlen(" -whom -check -verbose ") +
				    strlen(msgfname) + 1 )*sizeof(char)))
	== NULL ) {
	perror("malloc");
	return NOTOK;
    }
    
    (void) strcpy(command,postproc);
    (void) strcat(command," -whom -check ");
    if ( verbose )
	(void) strcat(command, "-verbose " );
    (void) strcat(command, msgfname);
    
    /* open up the pipe */
    if ( (verfp = popen(command,"r")) == NULL )
	return NOTOK;
    
    while ( fgets(buf, BUFSIZ, verfp) != NULL )
	/* sendmail returns:
	 *   address:  result
	 * so we need to strip the extra post headers.
	 */
	if ( verbose ) {
	    bp = buf;
	    while (isspace(*bp))
		bp++;
	    if ( *bp != '-' )
		(void) fputs(bp,stdout);
	}
    
    /* return the error status of post */
    return( pclose(verfp) >> 8 );
}

static int sendfile()
{
    char *command, buf[BUFSIZ];
    FILE *verfp, *popen();
    
    /* set up the command line for post */
    if ( (command = (char *)malloc((strlen(postproc) +
				    strlen(" -dist -verbose ") +
				    strlen(msgfname) + 1 )*sizeof(char)))
	== NULL ) {
	perror("malloc");
	return NOTOK;
    }
    
    (void) strcpy(command,postproc);
    (void) strcat(command," ");
    if ( verbose )
	(void) strcat(command, "-verbose " );
    if ( dodist )
	(void) strcat(command, "-dist " );
    (void) strcat(command, msgfname);
    
    /* open up the pipe */
    if ( (verfp = popen(command,"r")) == NULL )
	return NOTOK;
    
    while ( fgets(buf, BUFSIZ, verfp) != NULL )
	(void) fputs(buf,stdout);

    /* return the error status of post */
    return( pclose(verfp) >> 8 );
}

dofrom() {
    char	line[128];
    
    if (FullName)
	(void) sprintf(line, "From: %s <%s>\n", FullName, from);
    else
	(void) sprintf(line, "From: %s\n", from);
    (void) fputs(line, fp);
}

dobody() {
    register int    i;
    char    buffer[BUFSIZ];
    
    while (!feof (stdin) && !ferror (stdin) &&
	   (i = fread (buffer, sizeof (char), sizeof (buffer), stdin)) > 0)
	if (fwrite (buffer, sizeof (char), i , fp) != i )
	    adios (NULLCP, "Problem writing body");
    
    if (ferror (stdin))
	adios (NULLCP, "Problem reading body");
    
    if ( fclose(fp) != 0 )
	adios (NULLCP, "problem ending submission");
}

TYPESIG silentdie();

smtp()
{
    int sd,len;
    char buf[BUFSIZ], response[BUFSIZ];

    if ((sd = client(NULLCP, "tcp", "smtp", 0, response)) == NOTOK)
	adios (NULLCP, "cannot open smtp client process");

    (void) signal(SIGCHLD, silentdie);

    switch ((childid = fork())) {
	case NOTOK:
	    adios (NULLCP, "unable to fork smtp process");
	
	case OK:	/* i.e. child */
	    (void) dup2(sd,0);
	    break;

	default:	/* i.e. parent */
	    (void) dup2(sd,1);
	    break;
    }
    while ( (len = read(0, buf, BUFSIZ)) > 0)
	(void) write (1, buf, len);

    if (childid)
	(void) kill(childid, SIGHUP);

    exit(9);
}

/* ARGSUSED */
TYPESIG	die(sig)
int sig;
{
    if (fp) {
	(void) fclose(fp);
	(void) unlink(msgfname);
    }
    if (sig != SIGHUP)
	(void) fprintf(stderr, "sendmail: dying from signal %d\n", sig);
    exit(99);
}

/* ARGSUSED */

TYPESIG	silentdie(sig)
int sig;
{
    pidwait (childid, OK);
    exit(0);
}