rmail.c
来自「< linux网络编程工具>>配套源码」· C语言 代码 · 共 477 行
C
477 行
/*
* Copyright (c) 1998-2000 Sendmail, Inc. and its suppliers.
* All rights reserved.
* Copyright (c) 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* By using this file, you agree to the terms and conditions set
* forth in the LICENSE file which can be found at the top level of
* the sendmail distribution.
*
*/
#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1998-2000 Sendmail, Inc. and its suppliers.\n\
All rights reserved.\n\
Copyright (c) 1988, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* ! lint */
#ifndef lint
static char id[] = "@(#)$Id: rmail.c,v 8.39.4.8 2000/09/16 22:20:25 gshapiro Exp $";
#endif /* ! lint */
/*
* RMAIL -- UUCP mail server.
*
* This program reads the >From ... remote from ... lines that UUCP is so
* fond of and turns them into something reasonable. It then execs sendmail
* with various options built from these lines.
*
* The expected syntax is:
*
* <user> := [-a-z0-9]+
* <date> := ctime format
* <site> := [-a-z0-9!]+
* <blank line> := "^\n$"
* <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/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <ctype.h>
#include <fcntl.h>
#ifdef BSD4_4
# define FORK vfork
# include <paths.h>
#else /* BSD4_4 */
# define FORK fork
# ifndef _PATH_SENDMAIL
# define _PATH_SENDMAIL "/usr/lib/sendmail"
# endif /* ! _PATH_SENDMAIL */
#endif /* BSD4_4 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifdef EX_OK
# undef EX_OK /* unistd.h may have another use for this */
#endif /* EX_OK */
#include <sysexits.h>
#ifndef MAX
# define MAX(a, b) ((a) < (b) ? (b) : (a))
#endif /* ! MAX */
#ifndef __P
# ifdef __STDC__
# define __P(protos) protos
# else /* __STDC__ */
# define __P(protos) ()
# define const
# endif /* __STDC__ */
#endif /* ! __P */
#ifndef STDIN_FILENO
# define STDIN_FILENO 0
#endif /* ! STDIN_FILENO */
#if defined(BSD4_4) || defined(linux) || SOLARIS >= 20600 || (SOLARIS < 10000 && SOLARIS >= 206) || _AIX4 >= 40300 || defined(HPUX11)
# define HASSNPRINTF 1
#endif /* defined(BSD4_4) || defined(linux) || SOLARIS >= 20600 || (SOLARIS < 10000 && SOLARIS >= 206) || _AIX4 >= 40300 || defined(HPUX11) */
#if defined(sun) && !defined(BSD) && !defined(SOLARIS) && !defined(__svr4__) && !defined(__SVR4)
# define memmove(d, s, l) (bcopy((s), (d), (l)))
#endif /* defined(sun) && !defined(BSD) && !defined(SOLARIS) && !defined(__svr4__) && !defined(__SVR4) */
#if !HASSNPRINTF
extern int snprintf __P((char *, size_t, const char *, ...));
#endif /* !HASSNPRINTF */
#if defined(BSD4_4) || defined(__osf__) || defined(__GNU_LIBRARY__) || defined(IRIX64) || defined(IRIX5) || defined(IRIX6)
# ifndef HASSTRERROR
# define HASSTRERROR 1
# endif /* ! HASSTRERROR */
#endif /* defined(BSD4_4) || defined(__osf__) || defined(__GNU_LIBRARY__) ||
defined(IRIX64) || defined(IRIX5) || defined(IRIX6) */
#if defined(SUNOS403) || defined(NeXT) || (defined(MACH) && defined(i386) && !defined(__GNU__)) || defined(oldBSD43) || defined(MORE_BSD) || defined(umipsbsd) || defined(ALTOS_SYSTEM_V) || defined(RISCOS) || defined(_AUX_SOURCE) || defined(UMAXV) || defined(titan) || defined(UNIXWARE) || defined(sony_news) || defined(luna) || defined(nec_ews_svr4) || defined(_nec_ews_svr4) || defined(__MAXION__)
# undef WIFEXITED
# undef WEXITSTATUS
# define WIFEXITED(st) (((st) & 0377) == 0)
# define WEXITSTATUS(st) (((st) >> 8) & 0377)
#endif /* defined(SUNOS403) || defined(NeXT) || (defined(MACH) && defined(i386) && !defined(__GNU__)) || defined(oldBSD43) || defined(MORE_BSD) || defined(umipsbsd) || defined(ALTOS_SYSTEM_V) || defined(RISCOS) || defined(_AUX_SOURCE) || defined(UMAXV) || defined(titan) || defined(UNIXWARE) || defined(sony_news) || defined(luna) || defined(nec_ews_svr4) || defined(_nec_ews_svr4) || defined(__MAXION__) */
#include "sendmail/errstring.h"
static void err __P((int, const char *, ...));
static void usage __P((void));
static char *xalloc __P((int));
#define newstr(s) strcpy(xalloc(strlen(s) + 1), s)
static char *
xalloc(sz)
register int sz;
{
register char *p;
/* some systems can't handle size zero mallocs */
if (sz <= 0)
sz = 1;
p = malloc((unsigned) sz);
if (p == NULL)
err(EX_TEMPFAIL, "out of memory");
return (p);
}
int
main(argc, argv)
int argc;
char *argv[];
{
int ch, debug, i, pdes[2], pid, status;
size_t fplen = 0, fptlen = 0, len;
off_t offset;
FILE *fp;
char *addrp = NULL, *domain, *p, *t;
char *from_path, *from_sys, *from_user;
char **args, buf[2048], lbuf[2048];
struct stat sb;
extern char *optarg;
extern int optind;
debug = 0;
domain = "UUCP"; /* Default "domain". */
while ((ch = getopt(argc, argv, "D:T")) != -1)
{
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 == NULL || *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 != '\0'; ++t)
{
if (isascii(*t) && isspace(*t))
break;
}
*t = '\0';
if (debug)
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)
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 != '\0'; ++t)
{
if (isascii(*t) && isspace(*t))
break;
}
*t = '\0';
/* If the first system, copy to the from_sys string. */
if (from_sys == NULL)
{
from_sys = newstr(p);
if (debug)
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 != '\0'; ++p)
{
if (isascii(*p) && isspace(*p))
break;
}
*p = '\0';
if (*addrp == '\0')
addrp = "<>";
if (from_user != NULL)
free(from_user);
from_user = newstr(addrp);
if (debug)
{
if (from_path != NULL)
fprintf(stderr, "from_path: %s\n", from_path);
fprintf(stderr, "from_user: %s\n", from_user);
}
if (offset != -1)
offset = (off_t)ftell(stdin);
}
/* Allocate args (with room for sendmail args as well as recipients */
args = (char **)xalloc(sizeof(*args) * (10 + argc));
i = 0;
args[i++] = _PATH_SENDMAIL; /* Build sendmail's argument list. */
args[i++] = "-G"; /* relay submission */
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. */
/* set from system and protocol used */
if (from_sys == NULL)
snprintf(buf, sizeof(buf), "-p%s", domain);
else if (strchr(from_sys, '.') == NULL)
snprintf(buf, sizeof(buf), "-p%s:%s.%s",
domain, from_sys, domain);
else
snprintf(buf, sizeof(buf), "-p%s:%s", domain, from_sys);
args[i++] = newstr(buf);
/* Set name of ``from'' person. */
snprintf(buf, sizeof(buf), "-f%s%s",
from_path ? from_path : "", from_user);
args[i++] = newstr(buf);
/*
** Don't copy arguments beginning with - as they will be
** passed to sendmail and could be interpreted as flags.
** To prevent confusion of sendmail wrap < and > around
** the address (helps to pass addrs like @gw1,@gw2:aa@bb)
*/
while (*argv != NULL)
{
if (**argv == '-')
err(EX_USAGE, "dash precedes argument: %s", *argv);
if (strchr(*argv, ',') == NULL || strchr(*argv, '<') != NULL)
args[i++] = *argv;
else
{
len = strlen(*argv) + 3;
if ((args[i] = malloc(len)) == NULL)
err(EX_TEMPFAIL, "Cannot malloc");
snprintf(args[i++], len, "<%s>", *argv);
}
argv++;
argc--;
/* Paranoia check, argc used for args[] bound */
if (argc < 0)
err(EX_SOFTWARE, "Argument count mismatch");
}
args[i] = NULL;
if (debug)
{
fprintf(stderr, "Sendmail arguments:\n");
for (i = 0; args[i] != NULL; i++)
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");
(void) execv(_PATH_SENDMAIL, args);
err(EX_OSERR, "%s", _PATH_SENDMAIL);
}
if (pipe(pdes) < 0)
err(EX_OSERR, NULL);
switch (pid = FORK())
{
case -1: /* Err. */
err(EX_OSERR, NULL);
/* NOTREACHED */
case 0: /* Child. */
if (pdes[0] != STDIN_FILENO)
{
(void) dup2(pdes[0], STDIN_FILENO);
(void) close(pdes[0]);
}
(void) close(pdes[1]);
(void) 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", errstring(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);
/* NOTREACHED */
return EX_OK;
}
static void
usage()
{
(void) fprintf(stderr, "usage: rmail [-T] [-D domain] user ...\n");
exit(EX_USAGE);
}
#ifdef __STDC__
# include <stdarg.h>
#else /* __STDC__ */
# include <varargs.h>
#endif /* __STDC__ */
static void
#ifdef __STDC__
err(int eval, const char *fmt, ...)
#else /* __STDC__ */
err(eval, fmt, va_alist)
int eval;
const char *fmt;
va_dcl
#endif /* __STDC__ */
{
va_list ap;
#ifdef __STDC__
va_start(ap, fmt);
#else /* __STDC__ */
va_start(ap);
#endif /* __STDC__ */
(void) fprintf(stderr, "rmail: ");
(void) vfprintf(stderr, fmt, ap);
va_end(ap);
(void) fprintf(stderr, "\n");
exit(eval);
}
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