[unix-history] / usr / src / bin / rmail / rmail.c

/*
 * Copyright (c) 1988, 1993 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1988, 1993 The Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)rmail.c	5.2 (Berkeley) %G%";
#endif /* not lint */

/*
 * RMAIL -- UUCP mail server.
 *
 * This program reads the >From ... remote from ... lines that UUCP is so
 * fond of and turns them into something reasonable.  It then execs sendmail
 * with various options built from these lines. 
 *
 * The expected syntax is:
 *
 *	 <user> := [-a-z0-9]+
 *	 <date> := ctime format
 *	 <site> := [-a-z0-9!]+
 * <blank line> := "^\n$"
 *	 <from> := "From" <space> <user> <space> <date>
 *		  [<space> "remote from" <space> <site>]
 *    <forward> := ">" <from>
 *	    msg := <from> <forward>* <blank-line> <body>
 *
 * The output of rmail(8) compresses the <forward> lines into a single
 * from path.
 *
 * The err(3) routine is included here deliberately to make this code
 * a bit more portable.
 */
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/wait.h>

#include <ctype.h>
#include <fcntl.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
# include "conf.h"

void err __P((int, const char *, ...));
void usage __P((void));

int
main(argc, argv)
	int argc;
	char *argv[];
{
	extern char *optarg;
	extern int errno, optind;
	FILE *fp;
	struct stat sb;
	size_t fplen, fptlen, len;
	off_t offset;
	int ch, debug, i, pdes[2], pid, status;
	char *addrp, *domain, *p, *t;
	char *from_path, *from_sys, *from_user;
	char *args[100], buf[2048], lbuf[2048];

	debug = 0;
	domain = "UUCP";		/* Default "domain". */
	while ((ch = getopt(argc, argv, "D:T")) != EOF)
		switch (ch) {
		case 'T':
			debug = 1;
			break;
		case 'D':
			domain = optarg;
			break;
		case '?':
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

	if (argc < 1)
		usage();

	from_path = from_sys = from_user = NULL;
	for (offset = 0;;) {

		/* Get and nul-terminate the line. */
		if (fgets(lbuf, sizeof(lbuf), stdin) == NULL)
			exit (EX_DATAERR);
		if ((p = strchr(lbuf, '\n')) == NULL)
			err(EX_DATAERR, "line too long");
		*p = '\0';

		/* Parse lines until reach a non-"From" line. */
		if (!strncmp(lbuf, "From ", 5))
			addrp = lbuf + 5;
		else if (!strncmp(lbuf, ">From ", 6))
			addrp = lbuf + 6;
		else if (offset == 0)
			err(EX_DATAERR,
			    "missing or empty From line: %s", lbuf);
		else {
			*p = '\n';
			break;
		}

		if (*addrp == '\0')
			err(EX_DATAERR, "corrupted From line: %s", lbuf);

		/* Use the "remote from" if it exists. */
		for (p = addrp; (p = strchr(p + 1, 'r')) != NULL;)
			if (!strncmp(p, "remote from ", 12)) {
				for (t = p += 12; *t && !isspace(*t); ++t);
				*t = '\0';
				if (debug)
					(void)fprintf(stderr,
					    "remote from: %s\n", p);
				break;
			}

		/* Else use the string up to the last bang. */
		if (p == NULL)
			if (*addrp == '!')
				err(EX_DATAERR,
				    "bang starts address: %s", addrp);
			else if ((t = strrchr(addrp, '!')) != NULL) {
				*t = '\0';
				p = addrp;
				addrp = t + 1;
				if (*addrp == '\0')
					err(EX_DATAERR,
					    "corrupted From line: %s", lbuf);
				if (debug)
					(void)fprintf(stderr, "bang: %s\n", p);
			}

		/* 'p' now points to any system string from this line. */
		if (p != NULL) {
			/* Nul terminate it as necessary. */
			for (t = p; *t && !isspace(*t); ++t);
			*t = '\0';

			/* If the first system, copy to the from_sys string. */
			if (from_sys == NULL) {
				if ((from_sys = strdup(p)) == NULL)
					err(EX_TEMPFAIL, NULL);
				if (debug)
					(void)fprintf(stderr,
					    "from_sys: %s\n", from_sys);
			}

			/* Concatenate to the path string. */
			len = t - p;
			if (from_path == NULL) {
				fplen = 0;
				if ((from_path = malloc(fptlen = 256)) == NULL)
					err(EX_TEMPFAIL, NULL);
			}
			if (fplen + len + 2 > fptlen) {
				fptlen += MAX(fplen + len + 2, 256);
				if ((from_path =
				    realloc(from_path, fptlen)) == NULL)
					err(EX_TEMPFAIL, NULL);
			}
			memmove(from_path + fplen, p, len);
			fplen += len;
			from_path[fplen++] = '!';
			from_path[fplen] = '\0';
		}

		/* Save off from user's address; the last one wins. */
		for (p = addrp; *p && !isspace(*p); ++p);
		*p = '\0';
		if (from_user != NULL)
			free(from_user);
		if ((from_user = strdup(addrp)) == NULL)
			err(EX_TEMPFAIL, NULL);

		if (debug) {
			if (from_path != NULL)
				(void)fprintf(stderr,
				    "from_path: %s\n", from_path);
			(void)fprintf(stderr, "from_user: %s\n", from_user);
		}

		if (offset != -1)
			offset = (off_t)ftell(stdin);
	}

	i = 0;
	args[i++] = _PATH_SENDMAIL;	/* Build sendmail's argument list. */
	args[i++] = "-oee";		/* No errors, just status. */
	args[i++] = "-odq";		/* Queue it, don't try to deliver. */
	args[i++] = "-oi";		/* Ignore '.' on a line by itself. */

	if (from_sys != NULL) {		/* Set sender's host name. */
		if (strchr(from_sys, '.') == NULL)
			(void)snprintf(buf, sizeof(buf),
			    "-oMs%s.%s", from_sys, domain);
		else
			(void)snprintf(buf, sizeof(buf), "-oMs%s", from_sys);
		if ((args[i++] = strdup(buf)) == NULL)
			 err(EX_TEMPFAIL, NULL);
	}
					/* Set protocol used. */
	(void)snprintf(buf, sizeof(buf), "-oMr%s", domain);
	if ((args[i++] = strdup(buf)) == NULL)
		err(EX_TEMPFAIL, NULL);

					/* Set name of ``from'' person. */
	(void)snprintf(buf, sizeof(buf), "-f%s%s",
	    from_path ? from_path : "", from_user);
	if ((args[i++] = strdup(buf)) == NULL)
		err(EX_TEMPFAIL, NULL);

	/*
	 * Don't copy arguments beginning with - as they will be
	 * passed to sendmail and could be interpreted as flags.
	 */
	do {
		if (*argv && **argv == '-')
			err(EX_USAGE, "dash precedes argument: %s", *argv);
	} while ((args[i++] = *argv++) != NULL);

	if (debug) {
		(void)fprintf(stderr, "Sendmail arguments:\n");
		for (i = 0; args[i]; i++)
			(void)fprintf(stderr, "\t%s\n", args[i]);
	}

	/*
	 * If called with a regular file as standard input, seek to the right
	 * position in the file and just exec sendmail.  Could probably skip
	 * skip the stat, but it's not unreasonable to believe that a failed
	 * seek will cause future reads to fail.
	 */
	if (!fstat(STDIN_FILENO, &sb) && S_ISREG(sb.st_mode)) {
		if (lseek(STDIN_FILENO, offset, SEEK_SET) != offset)
			err(EX_TEMPFAIL, "stdin seek");
		execv(_PATH_SENDMAIL, args);
		err(EX_OSERR, "%s", _PATH_SENDMAIL);
	}

	if (pipe(pdes) < 0)
		err(EX_OSERR, NULL);

	switch (pid = vfork()) {
	case -1:				/* Err. */
		err(EX_OSERR, NULL);
	case 0:					/* Child. */
		if (pdes[0] != STDIN_FILENO) {
			(void)dup2(pdes[0], STDIN_FILENO);
			(void)close(pdes[0]);
		}
		(void)close(pdes[1]);
		execv(_PATH_SENDMAIL, args);
		_exit(127);
		/* NOTREACHED */
	}

	if ((fp = fdopen(pdes[1], "w")) == NULL)
		err(EX_OSERR, NULL);
	(void)close(pdes[0]);

	/* Copy the file down the pipe. */
	do {
		(void)fprintf(fp, "%s", lbuf);
	} while (fgets(lbuf, sizeof(lbuf), stdin) != NULL);

	if (ferror(stdin))
		err(EX_TEMPFAIL, "stdin: %s", strerror(errno));

	if (fclose(fp))
		err(EX_OSERR, NULL);

	if ((waitpid(pid, &status, 0)) == -1)
		err(EX_OSERR, "%s", _PATH_SENDMAIL);

	if (!WIFEXITED(status))
		err(EX_OSERR,
		    "%s: did not terminate normally", _PATH_SENDMAIL);

	if (WEXITSTATUS(status))
		err(status, "%s: terminated with %d (non-zero) status",
		    _PATH_SENDMAIL, WEXITSTATUS(status));
	exit(EX_OK);
}

void
usage()
{
	(void)fprintf(stderr, "usage: rmail [-T] [-D domain] user ...\n");
	exit(EX_USAGE);
}

#ifdef __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif

void
#ifdef __STDC__
err(int eval, const char *fmt, ...)
#else
err(eval, fmt, va_alist)
	int eval;
	const char *fmt;
	va_dcl
#endif
{
	va_list ap;
#if __STDC__
	va_start(ap, fmt);
#else
	va_start(ap);
#endif
	(void)fprintf(stderr, "rmail: ");
	(void)vfprintf(stderr, fmt, ap);
	va_end(ap);
	(void)fprintf(stderr, "\n");
	exit(eval);
}
Commit	Line	Data
9b7cb659	1	/*
1acd8217	2	* Copyright (c) 1988, 1993 The Regents of the University of California.
9b7cb659 KB	3	* All rights reserved.
9b7cb659 KB	4	*
27c71911	5	* %sccs.include.redist.c%
9b7cb659 KB	6	*/
	7
	8	#ifndef lint
	9	char copyright[] =
1acd8217	10	"@(#) Copyright (c) 1988, 1993 The Regents of the University of California.\n\
9b7cb659 KB	11	All rights reserved.\n";
	12	#endif /* not lint */
	13
205a2d85	14	#ifndef lint
46b3dbee	15	static char sccsid[] = "@(#)rmail.c 5.2 (Berkeley) %G%";
9b7cb659	16	#endif /* not lint */
205a2d85	17
9adc8f2c	18	/*
306f949d KB	19	* RMAIL -- UUCP mail server.
306f949d KB	20	*
1acd8217 KB	21	* This program reads the >From ... remote from ... lines that UUCP is so
	22	* fond of and turns them into something reasonable. It then execs sendmail
	23	* with various options built from these lines.
	24	*
	25	* The expected syntax is:
	26	*
	27	* <user> := [-a-z0-9]+
	28	* <date> := ctime format
	29	* <site> := [-a-z0-9!]+
	30	* <blank line> := "^\n$"
	31	* <from> := "From" <space> <user> <space> <date>
	32	* [<space> "remote from" <space> <site>]
	33	* <forward> := ">" <from>
	34	* msg := <from> <forward>* <blank-line> <body>
	35	*
	36	* The output of rmail(8) compresses the <forward> lines into a single
	37	* from path.
	38	*
	39	* The err(3) routine is included here deliberately to make this code
	40	* a bit more portable.
306f949d	41	*/
1acd8217	42	#include <sys/param.h>
306f949d	43	#include <sys/stat.h>
1acd8217 KB	44	#include <sys/wait.h>
	45
	46	#include <ctype.h>
	47	#include <fcntl.h>
7abf8d65	48	#include <paths.h>
1acd8217 KB	49	#include <stdio.h>
	50	#include <stdlib.h>
	51	#include <string.h>
	52	#include <sysexits.h>
	53	#include <unistd.h>
b5fd168f	54	# include "conf.h"
9adc8f2c	55
1acd8217 KB	56	void err __P((int, const char *, ...));
1acd8217 KB	57	void usage __P((void));
0f5791a6	58
1acd8217	59	int
9adc8f2c	60	main(argc, argv)
306f949d	61	int argc;
1acd8217	62	char *argv[];
9adc8f2c	63	{
1acd8217 KB	64	extern char *optarg;
	65	extern int errno, optind;
	66	FILE *fp;
	67	struct stat sb;
	68	size_t fplen, fptlen, len;
	69	off_t offset;
	70	int ch, debug, i, pdes[2], pid, status;
	71	char addrp, domain, p, t;
	72	char from_path, from_sys, *from_user;
	73	char *args[100], buf[2048], lbuf[2048];
9adc8f2c	74
1acd8217 KB	75	debug = 0;
	76	domain = "UUCP"; /* Default "domain". */
	77	while ((ch = getopt(argc, argv, "D:T")) != EOF)
	78	switch (ch) {
	79	case 'T':
	80	debug = 1;
9adc8f2c	81	break;
1acd8217 KB	82	case 'D':
	83	domain = optarg;
	84	break;
	85	case '?':
	86	default:
	87	usage();
	88	}
	89	argc -= optind;
	90	argv += optind;
	91
	92	if (argc < 1)
	93	usage();
	94
	95	from_path = from_sys = from_user = NULL;
	96	for (offset = 0;;) {
	97
	98	/* Get and nul-terminate the line. */
	99	if (fgets(lbuf, sizeof(lbuf), stdin) == NULL)
	100	exit (EX_DATAERR);
	101	if ((p = strchr(lbuf, '\n')) == NULL)
	102	err(EX_DATAERR, "line too long");
	103	*p = '\0';
	104
	105	/* Parse lines until reach a non-"From" line. */
	106	if (!strncmp(lbuf, "From ", 5))
	107	addrp = lbuf + 5;
	108	else if (!strncmp(lbuf, ">From ", 6))
	109	addrp = lbuf + 6;
	110	else if (offset == 0)
	111	err(EX_DATAERR,
	112	"missing or empty From line: %s", lbuf);
	113	else {
	114	*p = '\n';
	115	break;
	116	}
	117
	118	if (*addrp == '\0')
	119	err(EX_DATAERR, "corrupted From line: %s", lbuf);
	120
	121	/* Use the "remote from" if it exists. */
	122	for (p = addrp; (p = strchr(p + 1, 'r')) != NULL;)
	123	if (!strncmp(p, "remote from ", 12)) {
	124	for (t = p += 12; t && !isspace(t); ++t);
	125	*t = '\0';
	126	if (debug)
	127	(void)fprintf(stderr,
	128	"remote from: %s\n", p);
9adc8f2c	129	break;
1acd8217 KB	130	}
	131
	132	/* Else use the string up to the last bang. */
	133	if (p == NULL)
	134	if (*addrp == '!')
	135	err(EX_DATAERR,
	136	"bang starts address: %s", addrp);
	137	else if ((t = strrchr(addrp, '!')) != NULL) {
	138	*t = '\0';
	139	p = addrp;
	140	addrp = t + 1;
	141	if (*addrp == '\0')
	142	err(EX_DATAERR,
	143	"corrupted From line: %s", lbuf);
	144	if (debug)
	145	(void)fprintf(stderr, "bang: %s\n", p);
	146	}
	147
	148	/* 'p' now points to any system string from this line. */
	149	if (p != NULL) {
	150	/* Nul terminate it as necessary. */
	151	for (t = p; t && !isspace(t); ++t);
	152	*t = '\0';
	153
	154	/* If the first system, copy to the from_sys string. */
	155	if (from_sys == NULL) {
	156	if ((from_sys = strdup(p)) == NULL)
	157	err(EX_TEMPFAIL, NULL);
	158	if (debug)
	159	(void)fprintf(stderr,
	160	"from_sys: %s\n", from_sys);
	161	}
	162
	163	/* Concatenate to the path string. */
	164	len = t - p;
	165	if (from_path == NULL) {
	166	fplen = 0;
	167	if ((from_path = malloc(fptlen = 256)) == NULL)
	168	err(EX_TEMPFAIL, NULL);
	169	}
	170	if (fplen + len + 2 > fptlen) {
	171	fptlen += MAX(fplen + len + 2, 256);
	172	if ((from_path =
	173	realloc(from_path, fptlen)) == NULL)
	174	err(EX_TEMPFAIL, NULL);
	175	}
	176	memmove(from_path + fplen, p, len);
	177	fplen += len;
	178	from_path[fplen++] = '!';
	179	from_path[fplen] = '\0';
9adc8f2c	180	}
1acd8217 KB	181
	182	/* Save off from user's address; the last one wins. */
	183	for (p = addrp; p && !isspace(p); ++p);
	184	*p = '\0';
	185	if (from_user != NULL)
	186	free(from_user);
	187	if ((from_user = strdup(addrp)) == NULL)
	188	err(EX_TEMPFAIL, NULL);
	189
	190	if (debug) {
	191	if (from_path != NULL)
	192	(void)fprintf(stderr,
	193	"from_path: %s\n", from_path);
	194	(void)fprintf(stderr, "from_user: %s\n", from_user);
306f949d	195	}
1acd8217 KB	196
	197	if (offset != -1)
	198	offset = (off_t)ftell(stdin);
9adc8f2c	199	}
1acd8217 KB	200
	201	i = 0;
	202	args[i++] = _PATH_SENDMAIL; /* Build sendmail's argument list. */
	203	args[i++] = "-oee"; /* No errors, just status. */
	204	args[i++] = "-odq"; /* Queue it, don't try to deliver. */
	205	args[i++] = "-oi"; /* Ignore '.' on a line by itself. */
	206
	207	if (from_sys != NULL) { /* Set sender's host name. */
	208	if (strchr(from_sys, '.') == NULL)
	209	(void)snprintf(buf, sizeof(buf),
	210	"-oMs%s.%s", from_sys, domain);
	211	else
	212	(void)snprintf(buf, sizeof(buf), "-oMs%s", from_sys);
	213	if ((args[i++] = strdup(buf)) == NULL)
	214	err(EX_TEMPFAIL, NULL);
306f949d	215	}
1acd8217 KB	216	/* Set protocol used. */
	217	(void)snprintf(buf, sizeof(buf), "-oMr%s", domain);
	218	if ((args[i++] = strdup(buf)) == NULL)
	219	err(EX_TEMPFAIL, NULL);
	220
	221	/* Set name of ``from'' person. */
46b3dbee EA	222	(void)snprintf(buf, sizeof(buf), "-f%s%s",
46b3dbee EA	223	from_path ? from_path : "", from_user);
1acd8217 KB	224	if ((args[i++] = strdup(buf)) == NULL)
1acd8217 KB	225	err(EX_TEMPFAIL, NULL);
306f949d KB	226
306f949d KB	227	/*
1acd8217 KB	228	* Don't copy arguments beginning with - as they will be
1acd8217 KB	229	* passed to sendmail and could be interpreted as flags.
306f949d	230	*/
1acd8217	231	do {
46b3dbee	232	if (argv && *argv == '-')
1acd8217 KB	233	err(EX_USAGE, "dash precedes argument: %s", *argv);
	234	} while ((args[i++] = *argv++) != NULL);
	235
	236	if (debug) {
	237	(void)fprintf(stderr, "Sendmail arguments:\n");
	238	for (i = 0; args[i]; i++)
	239	(void)fprintf(stderr, "\t%s\n", args[i]);
306f949d	240	}
1acd8217 KB	241
	242	/*
	243	* If called with a regular file as standard input, seek to the right
	244	* position in the file and just exec sendmail. Could probably skip
	245	* skip the stat, but it's not unreasonable to believe that a failed
	246	* seek will cause future reads to fail.
	247	*/
	248	if (!fstat(STDIN_FILENO, &sb) && S_ISREG(sb.st_mode)) {
	249	if (lseek(STDIN_FILENO, offset, SEEK_SET) != offset)
	250	err(EX_TEMPFAIL, "stdin seek");
	251	execv(_PATH_SENDMAIL, args);
	252	err(EX_OSERR, "%s", _PATH_SENDMAIL);
0f5791a6	253	}
1acd8217 KB	254
	255	if (pipe(pdes) < 0)
	256	err(EX_OSERR, NULL);
	257
	258	switch (pid = vfork()) {
	259	case -1: /* Err. */
	260	err(EX_OSERR, NULL);
	261	case 0: /* Child. */
	262	if (pdes[0] != STDIN_FILENO) {
	263	(void)dup2(pdes[0], STDIN_FILENO);
	264	(void)close(pdes[0]);
	265	}
	266	(void)close(pdes[1]);
	267	execv(_PATH_SENDMAIL, args);
	268	_exit(127);
	269	/* NOTREACHED */
9777ef27	270	}
1acd8217 KB	271
	272	if ((fp = fdopen(pdes[1], "w")) == NULL)
	273	err(EX_OSERR, NULL);
	274	(void)close(pdes[0]);
	275
	276	/* Copy the file down the pipe. */
	277	do {
	278	(void)fprintf(fp, "%s", lbuf);
	279	} while (fgets(lbuf, sizeof(lbuf), stdin) != NULL);
	280
	281	if (ferror(stdin))
	282	err(EX_TEMPFAIL, "stdin: %s", strerror(errno));
	283
	284	if (fclose(fp))
	285	err(EX_OSERR, NULL);
	286
	287	if ((waitpid(pid, &status, 0)) == -1)
	288	err(EX_OSERR, "%s", _PATH_SENDMAIL);
	289
	290	if (!WIFEXITED(status))
	291	err(EX_OSERR,
	292	"%s: did not terminate normally", _PATH_SENDMAIL);
	293
	294	if (WEXITSTATUS(status))
	295	err(status, "%s: terminated with %d (non-zero) status",
	296	_PATH_SENDMAIL, WEXITSTATUS(status));
	297	exit(EX_OK);
	298	}
	299
	300	void
	301	usage()
	302	{
	303	(void)fprintf(stderr, "usage: rmail [-T] [-D domain] user ...\n");
	304	exit(EX_USAGE);
	305	}
	306
	307	#ifdef __STDC__
	308	#include <stdarg.h>
	309	#else
	310	#include <varargs.h>
306f949d	311	#endif
1acd8217 KB	312
	313	void
	314	#ifdef __STDC__
	315	err(int eval, const char *fmt, ...)
	316	#else
	317	err(eval, fmt, va_alist)
	318	int eval;
	319	const char *fmt;
	320	va_dcl
1b48a4b1	321	#endif
1acd8217 KB	322	{
	323	va_list ap;
	324	#if __STDC__
	325	va_start(ap, fmt);
	326	#else
	327	va_start(ap);
	328	#endif
	329	(void)fprintf(stderr, "rmail: ");
	330	(void)vfprintf(stderr, fmt, ap);
	331	va_end(ap);
	332	(void)fprintf(stderr, "\n");
	333	exit(eval);
9adc8f2c	334	}