📄 rmail.c

📁 早期freebsd实现
💻 C
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/* * Copyright (c) 1988, 1993 *	The Regents of the University of California.  All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright *    notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright *    notice, this list of conditions and the following disclaimer in the *    documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software *    must display the following acknowledgement: *	This product includes software developed by the University of *	California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors *    may be used to endorse or promote products derived from this software *    without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */#ifndef lintstatic char copyright[] ="@(#) Copyright (c) 1988, 1993\n\	The Regents of the University of California.  All rights reserved.\n";#endif /* not lint */#ifndef lintstatic char sccsid[] = "@(#)rmail.c	8.1 (Berkeley) 5/31/93";#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>void err __P((int, const char *, ...));void usage __P((void));intmain(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);}voidusage(){	(void)fprintf(stderr, "usage: rmail [-T] [-D domain] user ...\n");	exit(EX_USAGE);}#ifdef __STDC__#include <stdarg.h>#else#include <varargs.h>#endifvoid#ifdef __STDC__err(int eval, const char *fmt, ...)#elseerr(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);}
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