mail.local.c
上传用户:xu_441
上传日期:2007-01-04
资源大小:1640k
文件大小:35k
- /*
- * Copyright (c) 1998, 1999 Sendmail, Inc. and its suppliers.
- * All rights reserved.
- * Copyright (c) 1990, 1993, 1994
- * 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, 1999 Sendmail, Inc. and its suppliers.n
- All rights reserved.n
- Copyright (c) 1990, 1993, 1994n
- The Regents of the University of California. All rights reserved.n";
- #endif /* ! lint */
- #ifndef lint
- static char id[] = "@(#)$Id: mail.local.c,v 8.138 1999/12/02 19:52:26 gshapiro Exp $";
- #endif /* ! lint */
- /*
- ** This is not intended to work on System V derived systems
- ** such as Solaris or HP-UX, since they use a totally different
- ** approach to mailboxes (essentially, they have a setgid program
- ** rather than setuid, and they rely on the ability to "give away"
- ** files to do their work). IT IS NOT A BUG that this doesn't
- ** work on such architectures.
- */
- #include <sys/types.h>
- #include <sys/param.h>
- #include <sys/stat.h>
- #include <sys/socket.h>
- #include <sys/file.h>
- #include <netinet/in.h>
- #include <arpa/nameser.h>
- #include <fcntl.h>
- #include <netdb.h>
- #include <pwd.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <syslog.h>
- #include <time.h>
- #include <unistd.h>
- #ifdef EX_OK
- # undef EX_OK /* unistd.h may have another use for this */
- #endif /* EX_OK */
- #include <sysexits.h>
- #include <ctype.h>
- #ifndef __P
- # include "sendmail/cdefs.h"
- #endif /* ! __P */
- #include "sendmail/useful.h"
- extern size_t strlcpy __P((char *, const char *, size_t));
- extern size_t strlcat __P((char *, const char *, size_t));
- #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) */
- #include "sendmail/errstring.h"
- #ifndef LOCKTO_RM
- # define LOCKTO_RM 300 /* timeout for stale lockfile removal */
- #endif /* LOCKTO_RM */
- #ifndef LOCKTO_GLOB
- # define LOCKTO_GLOB 400 /* global timeout for lockfile creation */
- #endif /* LOCKTO_GLOB */
- #ifdef __STDC__
- # include <stdarg.h>
- # define REALLOC(ptr, size) realloc(ptr, size)
- #else /* __STDC__ */
- # include <varargs.h>
- /* define a realloc() which works for NULL pointers */
- # define REALLOC(ptr, size) (((ptr) == NULL) ? malloc(size) : realloc(ptr, size))
- #endif /* __STDC__ */
- #if (defined(sun) && defined(__svr4__)) || defined(__SVR4)
- # define USE_LOCKF 1
- # define USE_SETEUID 1
- # define _PATH_MAILDIR "/var/mail"
- #endif /* (defined(sun) && defined(__svr4__)) || defined(__SVR4) */
- #if defined(_AIX)
- # define USE_LOCKF 1
- # define USE_SETEUID 1
- # define USE_VSYSLOG 0
- #endif /* defined(_AIX) */
- #if defined(__hpux)
- # define USE_LOCKF 1
- # define USE_SETRESUID 1
- # define USE_VSYSLOG 0
- #endif /* defined(__hpux) */
- #if defined(_CRAY)
- # if !defined(MAXPATHLEN)
- # define MAXPATHLEN PATHSIZE
- # endif /* !defined(MAXPATHLEN) */
- # define USE_VSYSLOG 0
- # define _PATH_MAILDIR "/usr/spool/mail"
- #endif /* defined(_CRAY) */
- #if defined(ultrix)
- # define USE_VSYSLOG 0
- #endif /* defined(ultrix) */
- #if defined(__osf__)
- # define USE_VSYSLOG 0
- #endif /* defined(__osf__) */
- #if defined(NeXT) && !defined(__APPLE__)
- # include <libc.h>
- # define _PATH_MAILDIR "/usr/spool/mail"
- # define S_IRUSR S_IREAD
- # define S_IWUSR S_IWRITE
- #endif /* defined(NeXT) && !defined(__APPLE__) */
- #if defined(IRIX64) || defined(IRIX5) || defined(IRIX6)
- # include <paths.h>
- #endif /* defined(IRIX64) || defined(IRIX5) || defined(IRIX6) */
- /*
- * If you don't have flock, you could try using lockf instead.
- */
- #ifdef USE_LOCKF
- # define flock(a, b) lockf(a, b, 0)
- # ifdef LOCK_EX
- # undef LOCK_EX
- # endif /* LOCK_EX */
- # define LOCK_EX F_LOCK
- #endif /* USE_LOCKF */
- #ifndef USE_VSYSLOG
- # define USE_VSYSLOG 1
- #endif /* ! USE_VSYSLOG */
- #ifndef LOCK_EX
- # include <sys/file.h>
- #endif /* ! LOCK_EX */
- #if defined(BSD4_4) || defined(__GLIBC__)
- # include <paths.h>
- # define _PATH_LOCTMP "/tmp/local.XXXXXX"
- #endif /* defined(BSD4_4) || defined(__GLIBC__) */
- #ifdef BSD4_4
- # define HAS_ST_GEN 1
- #else /* BSD4_4 */
- # ifndef _BSD_VA_LIST_
- # define _BSD_VA_LIST_ va_list
- # endif /* ! _BSD_VA_LIST_ */
- #endif /* BSD4_4 */
- #if defined(BSD4_4) || defined(linux)
- # define HASSNPRINTF 1
- #else /* defined(BSD4_4) || defined(linux) */
- # ifndef ultrix
- extern FILE *fdopen __P((int, const char *));
- # endif /* ! ultrix */
- #endif /* defined(BSD4_4) || defined(linux) */
- #if SOLARIS >= 20300 || (SOLARIS < 10000 && SOLARIS >= 203)
- # define CONTENTLENGTH 1 /* Needs the Content-Length header */
- #endif /* SOLARIS >= 20300 || (SOLARIS < 10000 && SOLARIS >= 203) */
- #if SOLARIS >= 20600 || (SOLARIS < 10000 && SOLARIS >= 206)
- # define HASSNPRINTF 1 /* has snprintf starting in 2.6 */
- #endif /* SOLARIS >= 20600 || (SOLARIS < 10000 && SOLARIS >= 206) */
- #ifdef HPUX11
- # define HASSNPRINTF 1 /* has snprintf starting in 2.6 */
- #endif /* HPUX11 */
- #if _AIX4 >= 40300
- # define HASSNPRINTF 1 /* has snprintf starting in 4.3 */
- #endif /* _AIX4 >= 40300 */
- #if !HASSNPRINTF
- extern int snprintf __P((char *, size_t, const char *, ...));
- # ifndef _CRAY
- extern int vsnprintf __P((char *, size_t, const char *, ...));
- # endif /* ! _CRAY */
- #endif /* !HASSNPRINTF */
- /*
- ** If you don't have setreuid, and you have saved uids, and you have
- ** a seteuid() call that doesn't try to emulate using setuid(), then
- ** you can try defining USE_SETEUID.
- */
- #ifdef USE_SETEUID
- # define setreuid(r, e) seteuid(e)
- #endif /* USE_SETEUID */
- /*
- ** And of course on hpux you have setresuid()
- */
- #ifdef USE_SETRESUID
- # define setreuid(r, e) setresuid(-1, e, -1)
- #endif /* USE_SETRESUID */
- #ifndef _PATH_LOCTMP
- # define _PATH_LOCTMP "/tmp/local.XXXXXX"
- #endif /* ! _PATH_LOCTMP */
- # ifndef _PATH_MAILDIR
- # define _PATH_MAILDIR "/var/spool/mail"
- # endif /* ! _PATH_MAILDIR */
- #ifndef S_ISREG
- # define S_ISREG(mode) (((mode) & _S_IFMT) == S_IFREG)
- #endif /* ! S_ISREG */
- #ifndef INADDRSZ
- # define INADDRSZ 4 /* size of an IPv4 address in bytes */
- #endif /* ! INADDRSZ */
- #ifndef MAILER_DAEMON
- # define MAILER_DAEMON "MAILER-DAEMON"
- #endif /* ! MAILER_DAEMON */
- #ifdef MAILLOCK
- # include <maillock.h>
- #endif /* MAILLOCK */
- #ifdef CONTENTLENGTH
- char ContentHdr[40] = "Content-Length: ";
- off_t HeaderLength;
- off_t BodyLength;
- #endif /* CONTENTLENGTH */
- bool EightBitMime = TRUE; /* advertise 8BITMIME in LMTP */
- int ExitVal = EX_OK; /* sysexits.h error value. */
- bool LMTPMode = FALSE;
- bool bouncequota = FALSE; /* permanent error when over quota */
- void deliver __P((int, char *, bool));
- int e_to_sys __P((int));
- void notifybiff __P((char *));
- int store __P((char *, int));
- void usage __P((void));
- void vwarn __P((const char *, _BSD_VA_LIST_));
- int lockmbox __P((char *));
- void unlockmbox __P((void));
- void mailerr __P((const char *, const char *, ...));
- int
- main(argc, argv)
- int argc;
- char *argv[];
- {
- struct passwd *pw;
- int ch, fd;
- uid_t uid;
- char *from;
- extern char *optarg;
- extern int optind;
- extern void dolmtp __P((bool));
- /* make sure we have some open file descriptors */
- for (fd = 10; fd < 30; fd++)
- (void) close(fd);
- /* use a reasonable umask */
- (void) umask(0077);
- #ifdef LOG_MAIL
- openlog("mail.local", 0, LOG_MAIL);
- #else /* LOG_MAIL */
- openlog("mail.local", 0);
- #endif /* LOG_MAIL */
- from = NULL;
- while ((ch = getopt(argc, argv, "7bdf:r:l")) != EOF)
- {
- switch(ch)
- {
- case '7': /* Do not advertise 8BITMIME */
- EightBitMime = FALSE;
- break;
- case 'b': /* bounce mail when over quota. */
- bouncequota = TRUE;
- break;
- case 'd': /* Backward compatible. */
- break;
- case 'f':
- case 'r': /* Backward compatible. */
- if (from != NULL)
- {
- mailerr(NULL, "multiple -f options");
- usage();
- }
- from = optarg;
- break;
- case 'l':
- LMTPMode = TRUE;
- break;
- case '?':
- default:
- usage();
- }
- }
- argc -= optind;
- argv += optind;
- /* initialize biff structures */
- notifybiff(NULL);
- if (LMTPMode)
- dolmtp(bouncequota);
- if (*argv == ' ')
- usage();
- /*
- ** If from not specified, use the name from getlogin() if the
- ** uid matches, otherwise, use the name from the password file
- ** corresponding to the uid.
- */
- uid = getuid();
- if (from == NULL && ((from = getlogin()) == NULL ||
- (pw = getpwnam(from)) == NULL ||
- pw->pw_uid != uid))
- from = (pw = getpwuid(uid)) != NULL ? pw->pw_name : "???";
- /*
- ** There is no way to distinguish the error status of one delivery
- ** from the rest of the deliveries. So, if we failed hard on one
- ** or more deliveries, but had no failures on any of the others, we
- ** return a hard failure. If we failed temporarily on one or more
- ** deliveries, we return a temporary failure regardless of the other
- ** failures. This results in the delivery being reattempted later
- ** at the expense of repeated failures and multiple deliveries.
- */
- for (fd = store(from, 0); *argv; ++argv)
- deliver(fd, *argv, bouncequota);
- exit(ExitVal);
- /* NOTREACHED */
- return ExitVal;
- }
- char *
- parseaddr(s, rcpt)
- char *s;
- bool rcpt;
- {
- char *p;
- int l;
- if (*s++ != '<')
- return NULL;
- p = s;
- /* at-domain-list */
- while (*p == '@')
- {
- p++;
- while (*p != ',' && *p != ':' && *p != ' ')
- p++;
- if (*p == ' ')
- return NULL;
- /* Skip over , or : */
- p++;
- }
- s = p;
- /* local-part */
- if (*p == '"')
- {
- p++;
- while (*p && *p != '"')
- {
- if (*p == '\')
- {
- if (*++p == ' ')
- return NULL;
- }
- p++;
- }
- if (*p++ == ' ')
- return NULL;
- }
- else
- {
- while (*p != ' ' && *p != '@' && *p != '>')
- {
- if (*p == '\')
- {
- if (*++p == ' ')
- return NULL;
- }
- /* +detail ? */
- if (*p == '+' && rcpt)
- *p = ' ';
- p++;
- }
- }
- /* @domain */
- if (*p == '@')
- {
- if (rcpt)
- *p++ = ' ';
- while (*p != ' ' && *p != '>')
- p++;
- }
- if (*p != '>')
- return NULL;
- else
- *p = ' ';
- p++;
- if (*p != ' ' && *p != ' ')
- return NULL;
- if (*s == ' ')
- s = MAILER_DAEMON;
- l = strlen(s) + 1;
- p = malloc(l);
- if (p == NULL)
- {
- printf("421 4.3.0 memory exhaustedrn");
- exit(EX_TEMPFAIL);
- }
- (void) strlcpy(p, s, l);
- return p;
- }
- char *
- process_recipient(addr)
- char *addr;
- {
- if (getpwnam(addr) == NULL)
- return "550 5.1.1 user unknown";
- return NULL;
- }
- #define RCPT_GROW 30
- void
- dolmtp(bouncequota)
- bool bouncequota;
- {
- char *return_path = NULL;
- char **rcpt_addr = NULL;
- int rcpt_num = 0;
- int rcpt_alloc = 0;
- bool gotlhlo = FALSE;
- char *err;
- int msgfd;
- char *p;
- int i;
- char myhostname[1024];
- char buf[4096];
- (void) gethostname(myhostname, sizeof myhostname - 1);
- printf("220 %s LMTP readyrn", myhostname);
- for (;;)
- {
- (void) fflush(stdout);
- if (fgets(buf, sizeof(buf) - 1, stdin) == NULL)
- exit(EX_OK);
- p = buf + strlen(buf) - 1;
- if (p >= buf && *p == 'n')
- *p-- = ' ';
- if (p >= buf && *p == 'r')
- *p-- = ' ';
- switch (buf[0])
- {
- case 'd':
- case 'D':
- if (strcasecmp(buf, "data") == 0)
- {
- if (rcpt_num == 0)
- {
- printf("503 5.5.1 No recipientsrn");
- continue;
- }
- msgfd = store(return_path, rcpt_num);
- if (msgfd == -1)
- continue;
- for (i = 0; i < rcpt_num; i++)
- {
- p = strchr(rcpt_addr[i], '+');
- if (p != NULL)
- *p++ = ' ';
- deliver(msgfd, rcpt_addr[i], bouncequota);
- }
- (void) close(msgfd);
- goto rset;
- }
- goto syntaxerr;
- /* NOTREACHED */
- break;
- case 'l':
- case 'L':
- if (strncasecmp(buf, "lhlo ", 5) == 0)
- {
- /* check for duplicate per RFC 1651 4.2 */
- if (gotlhlo)
- {
- printf("503 %s Duplicate LHLOrn",
- myhostname);
- continue;
- }
- gotlhlo = TRUE;
- printf("250-%srn", myhostname);
- if (EightBitMime)
- printf("250-8BITMIMErn");
- printf("250-ENHANCEDSTATUSCODESrn");
- printf("250 PIPELININGrn");
- continue;
- }
- goto syntaxerr;
- /* NOTREACHED */
- break;
- case 'm':
- case 'M':
- if (strncasecmp(buf, "mail ", 5) == 0)
- {
- if (return_path != NULL)
- {
- printf("503 5.5.1 Nested MAIL commandrn");
- continue;
- }
- if (strncasecmp(buf+5, "from:", 5) != 0 ||
- ((return_path = parseaddr(buf + 10,
- FALSE)) == NULL))
- {
- printf("501 5.5.4 Syntax error in parametersrn");
- continue;
- }
- printf("250 2.5.0 okrn");
- continue;
- }
- goto syntaxerr;
- /* NOTREACHED */
- break;
- case 'n':
- case 'N':
- if (strcasecmp(buf, "noop") == 0)
- {
- printf("250 2.0.0 okrn");
- continue;
- }
- goto syntaxerr;
- /* NOTREACHED */
- break;
- case 'q':
- case 'Q':
- if (strcasecmp(buf, "quit") == 0)
- {
- printf("221 2.0.0 byern");
- exit(EX_OK);
- }
- goto syntaxerr;
- /* NOTREACHED */
- break;
- case 'r':
- case 'R':
- if (strncasecmp(buf, "rcpt ", 5) == 0)
- {
- if (return_path == NULL)
- {
- printf("503 5.5.1 Need MAIL commandrn");
- continue;
- }
- if (rcpt_num >= rcpt_alloc)
- {
- rcpt_alloc += RCPT_GROW;
- rcpt_addr = (char **)
- REALLOC((char *)rcpt_addr,
- rcpt_alloc *
- sizeof(char **));
- if (rcpt_addr == NULL)
- {
- printf("421 4.3.0 memory exhaustedrn");
- exit(EX_TEMPFAIL);
- }
- }
- if (strncasecmp(buf + 5, "to:", 3) != 0 ||
- ((rcpt_addr[rcpt_num] = parseaddr(buf + 8,
- TRUE)) == NULL))
- {
- printf("501 5.5.4 Syntax error in parametersrn");
- continue;
- }
- if ((err = process_recipient(rcpt_addr[rcpt_num])) != NULL)
- {
- printf("%srn", err);
- continue;
- }
- rcpt_num++;
- printf("250 2.1.5 okrn");
- continue;
- }
- else if (strcasecmp(buf, "rset") == 0)
- {
- printf("250 2.0.0 okrn");
- rset:
- while (rcpt_num)
- free(rcpt_addr[--rcpt_num]);
- if (return_path != NULL)
- free(return_path);
- return_path = NULL;
- continue;
- }
- goto syntaxerr;
- /* NOTREACHED */
- break;
- case 'v':
- case 'V':
- if (strncasecmp(buf, "vrfy ", 5) == 0)
- {
- printf("252 2.3.3 try RCPT to attempt deliveryrn");
- continue;
- }
- goto syntaxerr;
- /* NOTREACHED */
- break;
- default:
- syntaxerr:
- printf("500 5.5.2 Syntax errorrn");
- continue;
- /* NOTREACHED */
- break;
- }
- }
- }
- int
- store(from, lmtprcpts)
- char *from;
- int lmtprcpts;
- {
- FILE *fp = NULL;
- time_t tval;
- bool eline;
- bool fullline = TRUE;
- char line[2048];
- int fd;
- char tmpbuf[sizeof _PATH_LOCTMP + 1];
- (void) umask(0077);
- (void) strlcpy(tmpbuf, _PATH_LOCTMP, sizeof tmpbuf);
- if ((fd = mkstemp(tmpbuf)) == -1 || (fp = fdopen(fd, "w+")) == NULL)
- {
- if (lmtprcpts)
- {
- printf("451 4.3.0 unable to open temporary filern");
- return -1;
- }
- else
- {
- mailerr("451 4.3.0", "unable to open temporary file");
- exit(ExitVal);
- }
- }
- (void) unlink(tmpbuf);
- if (LMTPMode)
- {
- printf("354 go aheadrn");
- (void) fflush(stdout);
- }
- (void) time(&tval);
- (void) fprintf(fp, "From %s %s", from, ctime(&tval));
- #ifdef CONTENTLENGTH
- HeaderLength = 0;
- BodyLength = -1;
- #endif /* CONTENTLENGTH */
- line[0] = ' ';
- for (eline = TRUE; fgets(line, sizeof(line), stdin); )
- {
- size_t line_len = 0;
- int peek;
- while (line[line_len] != 'n' && line_len < sizeof(line) - 2)
- line_len++;
- line_len++;
- /* Check for dot-stuffing */
- if (fullline && lmtprcpts && line[0] == '.')
- {
- if (line[1] == 'n' ||
- (line[1] == 'r' && line[2] == 'n'))
- goto lmtpdot;
- memcpy(line, line + 1, line_len);
- line_len--;
- }
- /* Check to see if we have the full line from the fgets() */
- fullline = FALSE;
- if (line_len > 0)
- {
- if (line[line_len - 1] == 'n')
- {
- if (line_len >= 2 &&
- line[line_len - 2] == 'r')
- {
- (void) strlcpy(line + line_len - 2,
- "n", sizeof line -
- line_len + 2);
- line_len--;
- }
- fullline = TRUE;
- }
- else if (line[line_len - 1] == 'r')
- {
- /* Did we just miss the CRLF? */
- peek = fgetc(stdin);
- if (peek == 'n')
- {
- line[line_len - 1] = 'n';
- fullline = TRUE;
- }
- else
- (void) ungetc(peek, stdin);
- }
- }
- else
- fullline = TRUE;
- #ifdef CONTENTLENGTH
- if (line[0] == 'n' && HeaderLength == 0)
- {
- eline = FALSE;
- HeaderLength = ftell(fp);
- if (HeaderLength <= 0)
- {
- /*
- ** shouldn't happen, unless ftell() is
- ** badly broken
- */
- HeaderLength = -1;
- }
- }
- #else /* CONTENTLENGTH */
- if (line[0] == 'n')
- eline = TRUE;
- #endif /* CONTENTLENGTH */
- else
- {
- if (eline && line[0] == 'F' &&
- !memcmp(line, "From ", 5))
- (void)putc('>', fp);
- eline = FALSE;
- #ifdef CONTENTLENGTH
- /* discard existing "Content-Length:" headers */
- if (HeaderLength == 0 &&
- (line[0] == 'C' || line[0] == 'c') &&
- strncasecmp(line, ContentHdr, 15) == 0)
- continue;
- #endif /* CONTENTLENGTH */
- }
- (void) fwrite(line, sizeof(char), line_len, fp);
- if (ferror(fp))
- {
- if (lmtprcpts)
- {
- while (lmtprcpts--)
- printf("451 4.3.0 temporary file write errorrn");
- (void) fclose(fp);
- return -1;
- }
- else
- {
- mailerr("451 4.3.0",
- "temporary file write error");
- (void) fclose(fp);
- exit(ExitVal);
- }
- }
- }
- if (lmtprcpts)
- {
- /* Got a premature EOF -- toss message and exit */
- exit(EX_OK);
- }
- /* If message not newline terminated, need an extra. */
- if (strchr(line, 'n') == NULL)
- (void) putc('n', fp);
- lmtpdot:
- #ifdef CONTENTLENGTH
- BodyLength = ftell(fp);
- if (HeaderLength == 0 && BodyLength > 0) /* empty body */
- {
- HeaderLength = BodyLength;
- BodyLength = 0;
- }
- else
- BodyLength = BodyLength - HeaderLength - 1 ;
- if (HeaderLength > 0 && BodyLength >= 0)
- {
- extern char *quad_to_string();
- if (sizeof BodyLength > sizeof(long))
- snprintf(line, sizeof line, "%sn",
- quad_to_string(BodyLength));
- else
- snprintf(line, sizeof line, "%ldn", (long) BodyLength);
- strlcpy(&ContentHdr[16], line, sizeof(ContentHdr) - 16);
- }
- else
- BodyLength = -1; /* Something is wrong here */
- #endif /* CONTENTLENGTH */
- /* Output a newline; note, empty messages are allowed. */
- (void) putc('n', fp);
- if (fflush(fp) == EOF || ferror(fp) != 0)
- {
- if (lmtprcpts)
- {
- while (lmtprcpts--)
- printf("451 4.3.0 temporary file write errorrn");
- (void) fclose(fp);
- return -1;
- }
- else
- {
- mailerr("451 4.3.0", "temporary file write error");
- (void) fclose(fp);
- exit(ExitVal);
- }
- }
- return fd;
- }
- void
- deliver(fd, name, bouncequota)
- int fd;
- char *name;
- bool bouncequota;
- {
- struct stat fsb, sb;
- struct passwd *pw;
- char path[MAXPATHLEN];
- int mbfd, nr = 0, nw, off;
- char *p;
- off_t curoff;
- #ifdef CONTENTLENGTH
- off_t headerbytes;
- int readamount;
- #endif /* CONTENTLENGTH */
- char biffmsg[100], buf[8*1024];
- extern char *quad_to_string();
- /*
- ** Disallow delivery to unknown names -- special mailboxes can be
- ** handled in the sendmail aliases file.
- */
- if ((pw = getpwnam(name)) == NULL)
- {
- if (ExitVal != EX_TEMPFAIL)
- ExitVal = EX_UNAVAILABLE;
- if (LMTPMode)
- {
- if (ExitVal == EX_TEMPFAIL)
- printf("451 4.3.0 cannot lookup name: %srn", name);
- else
- printf("550 5.1.1 unknown name: %srn", name);
- }
- else
- {
- char *errcode = NULL;
- if (ExitVal == EX_TEMPFAIL)
- errcode = "451 4.3.0";
- else
- errcode = "550 5.1.1";
- mailerr(errcode, "unknown name: %s", name);
- }
- return;
- }
- endpwent();
- /*
- ** Keep name reasonably short to avoid buffer overruns.
- ** This isn't necessary on BSD because of the proper
- ** definition of snprintf(), but it can cause problems
- ** on other systems.
- ** Also, clear out any bogus characters.
- */
- if (strlen(name) > 40)
- name[40] = ' ';
- for (p = name; *p != ' '; p++)
- {
- if (!isascii(*p))
- *p &= 0x7f;
- else if (!isprint(*p))
- *p = '.';
- }
- (void) snprintf(path, sizeof(path), "%s/%s", _PATH_MAILDIR, name);
- /*
- ** If the mailbox is linked or a symlink, fail. There's an obvious
- ** race here, that the file was replaced with a symbolic link after
- ** the lstat returned, but before the open. We attempt to detect
- ** this by comparing the original stat information and information
- ** returned by an fstat of the file descriptor returned by the open.
- **
- ** NB: this is a symptom of a larger problem, that the mail spooling
- ** directory is writeable by the wrong users. If that directory is
- ** writeable, system security is compromised for other reasons, and
- ** it cannot be fixed here.
- **
- ** If we created the mailbox, set the owner/group. If that fails,
- ** just return. Another process may have already opened it, so we
- ** can't unlink it. Historically, binmail set the owner/group at
- ** each mail delivery. We no longer do this, assuming that if the
- ** ownership or permissions were changed there was a reason.
- **
- ** XXX
- ** open(2) should support flock'ing the file.
- */
- tryagain:
- #ifdef MAILLOCK
- p = name;
- #else /* MAILLOCK */
- p = path;
- #endif /* MAILLOCK */
- if ((off = lockmbox(p)) != 0)
- {
- if (off == EX_TEMPFAIL || e_to_sys(off) == EX_TEMPFAIL)
- {
- ExitVal = EX_TEMPFAIL;
- mailerr("451 4.3.0",
- "lockmailbox %s failed; error code %d %s",
- p, off, errno > 0 ? errstring(errno) : "");
- }
- else
- {
- mailerr("551 5.3.0",
- "lockmailbox %s failed; error code %d %s",
- p, off, errno > 0 ? errstring(errno) : "");
- }
- return;
- }
- if (lstat(path, &sb) < 0)
- {
- int save_errno;
- int mode = S_IRUSR|S_IWUSR;
- gid_t gid = pw->pw_gid;
- #ifdef MAILGID
- (void) umask(0007);
- gid = MAILGID;
- mode |= S_IRGRP|S_IWGRP;
- #endif /* MAILGID */
- mbfd = open(path, O_APPEND|O_CREAT|O_EXCL|O_WRONLY, mode);
- save_errno = errno;
- if (lstat(path, &sb) < 0)
- {
- ExitVal = EX_CANTCREAT;
- mailerr("550 5.2.0",
- "%s: lstat: file changed after open", path);
- goto err1;
- }
- else
- sb.st_uid = pw->pw_uid;
- if (mbfd == -1)
- {
- if (save_errno == EEXIST)
- goto tryagain;
- }
- else if (fchown(mbfd, pw->pw_uid, gid) < 0)
- {
- mailerr("451 4.3.0", "chown %u.%u: %s",
- pw->pw_uid, gid, name);
- goto err1;
- }
- }
- else if (sb.st_nlink != 1 || !S_ISREG(sb.st_mode))
- {
- mailerr("550 5.2.0", "%s: irregular file", path);
- goto err0;
- }
- else if (sb.st_uid != pw->pw_uid)
- {
- ExitVal = EX_CANTCREAT;
- mailerr("550 5.2.0", "%s: wrong ownership (%d)",
- path, sb.st_uid);
- goto err0;
- }
- else
- mbfd = open(path, O_APPEND|O_WRONLY, 0);
- if (mbfd == -1)
- {
- mailerr("450 4.2.0", "%s: %s", path, errstring(errno));
- goto err0;
- }
- else if (fstat(mbfd, &fsb) < 0 ||
- fsb.st_nlink != 1 ||
- sb.st_nlink != 1 ||
- !S_ISREG(fsb.st_mode) ||
- sb.st_dev != fsb.st_dev ||
- sb.st_ino != fsb.st_ino ||
- #if HAS_ST_GEN && 0 /* AFS returns random values for st_gen */
- sb.st_gen != fsb.st_gen ||
- #endif /* HAS_ST_GEN && 0 */
- sb.st_uid != fsb.st_uid)
- {
- ExitVal = EX_TEMPFAIL;
- mailerr("550 5.2.0", "%s: fstat: file changed after open",
- path);
- goto err1;
- }
- /* Wait until we can get a lock on the file. */
- if (flock(mbfd, LOCK_EX) < 0)
- {
- mailerr("450 4.2.0", "%s: %s", path, errstring(errno));
- goto err1;
- }
- /* Get the starting offset of the new message for biff. */
- curoff = lseek(mbfd, (off_t)0, SEEK_END);
- if (sizeof curoff > sizeof(long))
- (void)snprintf(biffmsg, sizeof(biffmsg), "%s@%sn",
- name, quad_to_string(curoff));
- else
- (void)snprintf(biffmsg, sizeof(biffmsg), "%s@%ldn",
- name, (long) curoff);
- /* Copy the message into the file. */
- if (lseek(fd, (off_t)0, SEEK_SET) == (off_t)-1)
- {
- mailerr("450 4.2.0", "temporary file: %s",
- errstring(errno));
- goto err1;
- }
- if (setreuid(0, pw->pw_uid) < 0)
- {
- mailerr("450 4.2.0", "setreuid(0, %d): %s (r=%d, e=%d)",
- pw->pw_uid, errstring(errno), getuid(), geteuid());
- goto err1;
- }
- #ifdef DEBUG
- fprintf(stderr, "new euid = %dn", geteuid());
- #endif /* DEBUG */
- #ifdef CONTENTLENGTH
- headerbytes = (BodyLength >= 0) ? HeaderLength : -1 ;
- for (;;)
- {
- if (headerbytes == 0)
- {
- snprintf(buf, sizeof buf, "%s", ContentHdr);
- nr = strlen(buf);
- headerbytes = -1;
- readamount = 0;
- }
- else if (headerbytes > sizeof(buf) || headerbytes < 0)
- readamount = sizeof(buf);
- else
- readamount = headerbytes;
- if (readamount != 0)
- nr = read(fd, buf, readamount);
- if (nr <= 0)
- break;
- if (headerbytes > 0)
- headerbytes -= nr ;
- #else /* CONTENTLENGTH */
- while ((nr = read(fd, buf, sizeof(buf))) > 0)
- {
- #endif /* CONTENTLENGTH */
- for (off = 0; off < nr; off += nw)
- {
- if ((nw = write(mbfd, buf + off, nr - off)) < 0)
- {
- #ifdef EDQUOT
- if (errno == EDQUOT && bouncequota)
- mailerr("552 5.2.2", "%s: %s",
- path, errstring(errno));
- else
- #endif /* EDQUOT */
- mailerr("450 4.2.0", "%s: %s",
- path, errstring(errno));
- goto err3;
- }
- }
- }
- if (nr < 0)
- {
- mailerr("450 4.2.0", "temporary file: %s",
- errstring(errno));
- goto err3;
- }
- /* Flush to disk, don't wait for update. */
- if (fsync(mbfd) < 0)
- {
- mailerr("450 4.2.0", "%s: %s", path, errstring(errno));
- err3:
- if (setreuid(0, 0) < 0)
- {
- #if 0
- /* already printed an error above for this recipient */
- (void) e_to_sys(errno);
- mailerr("450 4.2.0", "setreuid(0, 0): %s",
- errstring(errno));
- #endif /* 0 */
- }
- #ifdef DEBUG
- fprintf(stderr, "reset euid = %dn", geteuid());
- #endif /* DEBUG */
- (void) ftruncate(mbfd, curoff);
- err1: (void) close(mbfd);
- err0: unlockmbox();
- return;
- }
- /* Close and check -- NFS doesn't write until the close. */
- if (close(mbfd))
- {
- #ifdef EDQUOT
- if (errno == EDQUOT && bouncequota)
- mailerr("552 5.2.2", "%s: %s", path, errstring(errno));
- else
- #endif /* EDQUOT */
- mailerr("450 4.2.0", "%s: %s", path, errstring(errno));
- (void) truncate(path, curoff);
- }
- else
- notifybiff(biffmsg);
- if (setreuid(0, 0) < 0)
- {
- mailerr("450 4.2.0", "setreuid(0, 0): %s",
- errstring(errno));
- goto err0;
- }
- #ifdef DEBUG
- fprintf(stderr, "reset euid = %dn", geteuid());
- #endif /* DEBUG */
- unlockmbox();
- if (LMTPMode)
- printf("250 2.1.5 %s OKrn", name);
- }
- /*
- ** user.lock files are necessary for compatibility with other
- ** systems, e.g., when the mail spool file is NFS exported.
- ** Alas, mailbox locking is more than just a local matter.
- ** EPA 11/94.
- */
- bool Locked = FALSE;
- #ifdef MAILLOCK
- int
- lockmbox(name)
- char *name;
- {
- int r;
- if (Locked)
- return 0;
- if ((r = maillock(name, 15)) == L_SUCCESS)
- {
- Locked = TRUE;
- return 0;
- }
- switch (r)
- {
- case L_TMPLOCK: /* Can't create tmp file */
- case L_TMPWRITE: /* Can't write pid into lockfile */
- case L_MAXTRYS: /* Failed after retrycnt attempts */
- errno = 0;
- r = EX_TEMPFAIL;
- break;
- case L_ERROR: /* Check errno for reason */
- r = errno;
- break;
- default: /* other permanent errors */
- errno = 0;
- r = EX_UNAVAILABLE;
- break;
- }
- return r;
- }
- void
- unlockmbox()
- {
- if (Locked)
- mailunlock();
- Locked = FALSE;
- }
- #else /* MAILLOCK */
- char LockName[MAXPATHLEN];
- int
- lockmbox(path)
- char *path;
- {
- int statfailed = 0;
- time_t start;
- if (Locked)
- return 0;
- if (strlen(path) + 6 > sizeof LockName)
- return EX_SOFTWARE;
- (void) snprintf(LockName, sizeof LockName, "%s.lock", path);
- (void) time(&start);
- for (; ; sleep(5))
- {
- int fd;
- struct stat st;
- time_t now;
- /* global timeout */
- (void) time(&now);
- if (now > start + LOCKTO_GLOB)
- {
- errno = 0;
- return EX_TEMPFAIL;
- }
- fd = open(LockName, O_WRONLY|O_EXCL|O_CREAT, 0);
- if (fd >= 0)
- {
- /* defeat lock checking programs which test pid */
- (void) write(fd, "0", 2);
- Locked = TRUE;
- (void) close(fd);
- return 0;
- }
- if (stat(LockName, &st) < 0)
- {
- if (statfailed++ > 5)
- {
- errno = 0;
- return EX_TEMPFAIL;
- }
- continue;
- }
- statfailed = 0;
- (void) time(&now);
- if (now < st.st_ctime + LOCKTO_RM)
- continue;
- /* try to remove stale lockfile */
- if (unlink(LockName) < 0)
- return errno;
- }
- }
- void
- unlockmbox()
- {
- if (!Locked)
- return;
- (void) unlink(LockName);
- Locked = FALSE;
- }
- #endif /* MAILLOCK */
- void
- notifybiff(msg)
- char *msg;
- {
- static bool initialized = FALSE;
- static int f = -1;
- struct hostent *hp;
- struct servent *sp;
- int len;
- static struct sockaddr_in addr;
- if (!initialized)
- {
- initialized = TRUE;
- /* Be silent if biff service not available. */
- if ((sp = getservbyname("biff", "udp")) == NULL ||
- (hp = gethostbyname("localhost")) == NULL ||
- hp->h_length != INADDRSZ)
- return;
- addr.sin_family = hp->h_addrtype;
- memcpy(&addr.sin_addr, hp->h_addr, INADDRSZ);
- addr.sin_port = sp->s_port;
- }
- /* No message, just return */
- if (msg == NULL)
- return;
- /* Couldn't initialize addr struct */
- if (addr.sin_family == AF_UNSPEC)
- return;
- if (f < 0 && (f = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
- return;
- len = strlen(msg) + 1;
- (void) sendto(f, msg, len, 0, (struct sockaddr *) &addr, sizeof(addr));
- }
- void
- usage()
- {
- ExitVal = EX_USAGE;
- mailerr(NULL, "usage: mail.local [-l] [-f from] user ...");
- exit(ExitVal);
- }
- void
- #ifdef __STDC__
- mailerr(const char *hdr, const char *fmt, ...)
- #else /* __STDC__ */
- mailerr(hdr, fmt, va_alist)
- const char *hdr;
- const char *fmt;
- va_dcl
- #endif /* __STDC__ */
- {
- va_list ap;
- #ifdef __STDC__
- va_start(ap, fmt);
- #else /* __STDC__ */
- va_start(ap);
- #endif /* __STDC__ */
- if (LMTPMode)
- {
- if (hdr != NULL)
- printf("%s ", hdr);
- (void) vprintf(fmt, ap);
- (void) printf("rn");
- }
- else
- {
- (void) e_to_sys(errno);
- vwarn(fmt, ap);
- }
- }
- void
- vwarn(fmt, ap)
- const char *fmt;
- _BSD_VA_LIST_ ap;
- {
- /*
- ** Log the message to stderr.
- **
- ** Don't use LOG_PERROR as an openlog() flag to do this,
- ** it's not portable enough.
- */
- if (ExitVal != EX_USAGE)
- (void) fprintf(stderr, "mail.local: ");
- (void) vfprintf(stderr, fmt, ap);
- (void) fprintf(stderr, "n");
- #if USE_VSYSLOG
- /* Log the message to syslog. */
- vsyslog(LOG_ERR, fmt, ap);
- #else /* USE_VSYSLOG */
- {
- char fmtbuf[10240];
- (void) vsnprintf(fmtbuf, sizeof fmtbuf, fmt, ap);
- syslog(LOG_ERR, "%s", fmtbuf);
- }
- #endif /* USE_VSYSLOG */
- }
- /*
- * e_to_sys --
- * Guess which errno's are temporary. Gag me.
- */
- int
- e_to_sys(num)
- int num;
- {
- /* Temporary failures override hard errors. */
- if (ExitVal == EX_TEMPFAIL)
- return ExitVal;
- switch (num) /* Hopefully temporary errors. */
- {
- #ifdef EDQUOT
- case EDQUOT: /* Disc quota exceeded */
- if (bouncequota)
- {
- ExitVal = EX_UNAVAILABLE;
- break;
- }
- /* FALLTHROUGH */
- #endif /* EDQUOT */
- #ifdef EAGAIN
- case EAGAIN: /* Resource temporarily unavailable */
- #endif /* EAGAIN */
- #ifdef EBUSY
- case EBUSY: /* Device busy */
- #endif /* EBUSY */
- #ifdef EPROCLIM
- case EPROCLIM: /* Too many processes */
- #endif /* EPROCLIM */
- #ifdef EUSERS
- case EUSERS: /* Too many users */
- #endif /* EUSERS */
- #ifdef ECONNABORTED
- case ECONNABORTED: /* Software caused connection abort */
- #endif /* ECONNABORTED */
- #ifdef ECONNREFUSED
- case ECONNREFUSED: /* Connection refused */
- #endif /* ECONNREFUSED */
- #ifdef ECONNRESET
- case ECONNRESET: /* Connection reset by peer */
- #endif /* ECONNRESET */
- #ifdef EDEADLK
- case EDEADLK: /* Resource deadlock avoided */
- #endif /* EDEADLK */
- #ifdef EFBIG
- case EFBIG: /* File too large */
- #endif /* EFBIG */
- #ifdef EHOSTDOWN
- case EHOSTDOWN: /* Host is down */
- #endif /* EHOSTDOWN */
- #ifdef EHOSTUNREACH
- case EHOSTUNREACH: /* No route to host */
- #endif /* EHOSTUNREACH */
- #ifdef EMFILE
- case EMFILE: /* Too many open files */
- #endif /* EMFILE */
- #ifdef ENETDOWN
- case ENETDOWN: /* Network is down */
- #endif /* ENETDOWN */
- #ifdef ENETRESET
- case ENETRESET: /* Network dropped connection on reset */
- #endif /* ENETRESET */
- #ifdef ENETUNREACH
- case ENETUNREACH: /* Network is unreachable */
- #endif /* ENETUNREACH */
- #ifdef ENFILE
- case ENFILE: /* Too many open files in system */
- #endif /* ENFILE */
- #ifdef ENOBUFS
- case ENOBUFS: /* No buffer space available */
- #endif /* ENOBUFS */
- #ifdef ENOMEM
- case ENOMEM: /* Cannot allocate memory */
- #endif /* ENOMEM */
- #ifdef ENOSPC
- case ENOSPC: /* No space left on device */
- #endif /* ENOSPC */
- #ifdef EROFS
- case EROFS: /* Read-only file system */
- #endif /* EROFS */
- #ifdef ESTALE
- case ESTALE: /* Stale NFS file handle */
- #endif /* ESTALE */
- #ifdef ETIMEDOUT
- case ETIMEDOUT: /* Connection timed out */
- #endif /* ETIMEDOUT */
- #if defined(EWOULDBLOCK) && EWOULDBLOCK != EAGAIN && EWOULDBLOCK != EDEADLK
- case EWOULDBLOCK: /* Operation would block. */
- #endif /* defined(EWOULDBLOCK) && EWOULDBLOCK != EAGAIN && EWOULDBLOCK != EDEADLK */
- ExitVal = EX_TEMPFAIL;
- break;
- default:
- ExitVal = EX_UNAVAILABLE;
- break;
- }
- return ExitVal;
- }
- #if defined(ultrix) || defined(_CRAY)
- /*
- * Copyright (c) 1987, 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.
- */
- # if defined(LIBC_SCCS) && !defined(lint)
- static char sccsid[] = "@(#)mktemp.c 8.1 (Berkeley) 6/4/93";
- # endif /* defined(LIBC_SCCS) && !defined(lint) */
- # include <sys/types.h>
- # include <sys/stat.h>
- # include <fcntl.h>
- # include <errno.h>
- # include <stdio.h>
- # include <ctype.h>
- static int _gettemp();
- mkstemp(path)
- char *path;
- {
- int fd;
- return (_gettemp(path, &fd) ? fd : -1);
- }
- # if 0
- char *
- mktemp(path)
- char *path;
- {
- return(_gettemp(path, (int *)NULL) ? path : (char *)NULL);
- }
- # endif /* 0 */
- static
- _gettemp(path, doopen)
- char *path;
- register int *doopen;
- {
- extern int errno;
- register char *start, *trv;
- struct stat sbuf;
- u_int pid;
- pid = getpid();
- for (trv = path; *trv; ++trv); /* extra X's get set to 0's */
- while (*--trv == 'X')
- {
- *trv = (pid % 10) + '0';
- pid /= 10;
- }
- /*
- * check the target directory; if you have six X's and it
- * doesn't exist this runs for a *very* long time.
- */
- for (start = trv + 1;; --trv)
- {
- if (trv <= path)
- break;
- if (*trv == '/')
- {
- *trv = ' ';
- if (stat(path, &sbuf) < 0)
- return(0);
- if (!S_ISDIR(sbuf.st_mode))
- {
- errno = ENOTDIR;
- return(0);
- }
- *trv = '/';
- break;
- }
- }
- for (;;)
- {
- if (doopen)
- {
- if ((*doopen =
- open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0)
- return(1);
- if (errno != EEXIST)
- return(0);
- }
- else if (stat(path, &sbuf) < 0)
- return(errno == ENOENT ? 1 : 0);
- /* tricky little algorithm for backward compatibility */
- for (trv = start;;)
- {
- if (!*trv)
- return(0);
- if (*trv == 'z')
- *trv++ = 'a';
- else
- {
- if (isascii(*trv) && isdigit(*trv))
- *trv = 'a';
- else
- ++*trv;
- break;
- }
- }
- }
- /* NOTREACHED */
- }
- #endif /* defined(ultrix) || defined(_CRAY) */