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- /*
- * Copyright (c) 1983 Eric P. Allman
- * Copyright (c) 1988 Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms are permitted provided
- * that: (1) source distributions retain this entire copyright notice and
- * comment, and (2) distributions including binaries display the following
- * acknowledgement: ``This product includes software developed by the
- * University of California, Berkeley and its contributors'' in the
- * documentation or other materials provided with the distribution and in
- * all advertising materials mentioning features or use of this software.
- * 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
- */
-
- #include "sendmail.h"
- #include <sys/stat.h>
- #include <errno.h>
- #ifdef ISC
- # include <net/errno.h>
- #endif /* ISC */
- #include <pwd.h>
- #ifdef YP
- # include <sys/param.h>
- # ifndef MAXHOSTNAMELEN
- # define MAXHOSTNAMELEN 64
- # endif /* !MAXHOSTNAMELEN */
- #endif /* YP */
- #ifndef S_IREAD
- # define S_IREAD _S_IREAD
- #endif /* !S_IREAD */
-
- #ifndef lint
- # ifdef DBM
- static char sccsid[] = "@(#)alias.c 5.21 (Berkeley) 6/1/90 (with DBM)";
- static char rcsid[] = "@(#)$Id: alias.c,v 5.21.0.24 1991/08/14 16:56:42 paul Exp $ (with DBM)";
- # else /* !DBM */
- static char sccsid[] = "@(#)alias.c 5.21 (Berkeley) 6/1/90 (without DBM)";
- static char rcsid[] = "@(#)$Id: alias.c,v 5.21.0.24 1991/08/14 16:56:42 paul Exp $ (without DBM)";
- # endif /* DBM */
- #endif /* not lint */
-
- #ifdef __STDC__
- static void print_mailer(MAILER *);
- static void readaliases(int);
- #else /* !__STDC__ */
- static void print_mailer();
- static void readaliases();
- #endif /* __STDC__ */
-
- /*
- ** ALIAS -- Compute aliases.
- **
- ** Scans the alias file for an alias for the given address.
- ** If found, it arranges to deliver to the alias list instead.
- ** Uses libdbm database if -DDBM.
- **
- ** Parameters:
- ** a -- address to alias.
- ** sendq -- a pointer to the head of the send queue
- ** to put the aliases in.
- **
- ** Returns:
- ** none
- **
- ** Side Effects:
- ** Aliases found are expanded.
- **
- ** Notes:
- ** If NoAlias (the "-n" flag) is set, no aliasing is
- ** done.
- **
- ** Deficiencies:
- ** It should complain about names that are aliased to
- ** nothing.
- */
-
-
- #if defined(DBM) && !defined(NDBM) && !defined(OTHERDBM)
- # ifdef __STDC__
- extern XDATUM fetch(XDATUM);
- # else /* !__STDC__ */
- extern XDATUM fetch();
- # endif /* __STDC__ */
- #endif /* DBM && !NDBM && !OTHERDBM */
-
- void
- alias(a, sendq)
- register ADDRESS *a;
- ADDRESS **sendq;
- {
- register char *p;
-
- if (tTd(27, 1))
- printf("alias(%s)\n", a->q_user);
-
- /* don't realias already aliased names */
- if (bitset(QDONTSEND, a->q_flags))
- return;
-
- CurEnv->e_to = a->q_paddr;
-
- /*
- ** Look up this name
- */
-
- if (NoAlias)
- p = NULL;
- else
- p = aliaslookup(a->q_user);
- if (p == NULL)
- return;
-
- /*
- ** Match on Alias.
- ** Deliver to the target list.
- */
-
- if (tTd(27, 1))
- printf("%s (%s, %s) aliased to %s\n",
- a->q_paddr, a->q_host, a->q_user, p);
- message(Arpa_Info, "aliased to %s", p);
-
- /* sendtolist() will detect a possible self-reference for this alias */
- a->q_flags &= ~QSELFREF;
- AliasLevel++;
- sendtolist(p, a, sendq);
- AliasLevel--;
- if (!bitset(QSELFREF, a->q_flags))
- a->q_flags |= QDONTSEND;
- }
- /*
- ** ALIASLOOKUP -- look up a name in the alias file.
- **
- ** Parameters:
- ** name -- the name to look up.
- **
- ** Returns:
- ** the value of name.
- ** NULL if unknown.
- **
- ** Side Effects:
- ** none.
- **
- ** Warnings:
- ** The return value will be trashed across calls
- ** unless NDBM or OTHERDBM is defined and we're using mapkey().
- */
-
- char *
- aliaslookup(name)
- char *name;
- {
- #ifdef DBM
- # if defined(NDBM) || defined(OTHERDBM)
- char *newname;
-
- if (tTd(27, 3))
- printf("aliaslookup(\"%s\") => ", name);
- newname = mapkey(DB_ALIAS, name, 0, (char *)NULL);
- if (tTd(27, 3))
- printf("%s\n", newname == NULL ? "NOT_FOUND" : newname);
- return newname;
-
- # else /* !NDBM && !OTHERDBM */
-
- XDATUM rhs, lhs;
- char *lowname = newstr(name);
-
- /* create a key for fetch */
- (void) makelower(lowname);
- lhs.dsize = strlen(name);
- if (tTd(27, 3))
- printf("aliaslookup(\"%s\") => ", name);
-
- /* first try key as given */
- lhs.dptr = name;
- rhs = fetch(lhs);
- if (rhs.dptr == (char *)NULL)
- {
- /* try null-terminated version */
- lhs.dsize += 1;
- rhs = fetch(lhs);
- lhs.dsize -= 1;
- if (rhs.dptr == (char *)NULL)
- {
- /* try lower-case version */
- lhs.dptr = lowname;
- rhs = fetch(lhs);
- if (rhs.dptr == (char *)NULL)
- {
- /* try null-terminated lower-case version */
- lhs.dsize += 1;
- rhs = fetch(lhs);
- }
- }
- }
- free(lowname);
- if (tTd(27, 3))
- (rhs.dptr) ? printf("%.*s\n", rhs.dsize, rhs.dptr)
- : printf("NOT_FOUND\n");
- return (rhs.dptr);
- # endif /* NDBM || OTHERDBM */
- #else /* !DBM */
- register STAB *s;
-
- s = stab(name, ST_ALIAS, ST_FIND);
- if (tTd(27, 3))
- printf("%s\n", s == NULL ? "NOT_FOUND" : s->s_alias);
- if (s == NULL)
- return (NULL);
- return (s->s_alias);
- #endif /* DBM */
- }
- /*
- ** INITALIASES -- initialize for aliasing
- **
- ** Very different depending on whether we are running DBM or not.
- **
- ** Parameters:
- ** init -- if set and if DBM, initialize the DBM files.
- **
- ** Returns:
- ** none.
- **
- ** Side Effects:
- ** initializes aliases:
- ** if DBM: opens the database.
- ** if ~DBM: reads the aliases into the symbol table.
- */
-
- #define DBMMODE 0644
-
- void
- initaliases(init)
- bool init;
- {
- #ifdef DBM
- int atcnt;
- TIME_TYPE modtime;
- bool automatic = FALSE;
- char buf[MAXNAME];
- #endif /* DBM */
- struct stat stb;
- static bool initialized = FALSE;
-
- if (initialized)
- return;
- initialized = TRUE;
-
- if (AliasFile == NULL ||
- #ifdef YPMARK
- (AliasFile[0] != YPMARK &&
- #endif /* YPMARK */
- stat(AliasFile, &stb) < 0)
- #ifdef YPMARK
- )
- #endif /* YPMARK */
- {
- if (AliasFile != NULL && init)
- syserr("Cannot open %s", AliasFile);
- NoAlias = TRUE;
- errno = 0;
- return;
- }
-
- #ifdef DBM
- /*
- ** Check to see that the alias file is complete.
- ** If not, we will assume that someone died, and it is up
- ** to us to rebuild it.
- */
-
- # if !defined(NDBM) && !defined(OTHERDBM)
- if (!init)
- dbminit(AliasFile);
- # endif /* !NDBM && !OTHERDBM */
- atcnt = SafeAlias * 2;
- if (atcnt > 0)
- while (!init && atcnt-- >= 0 && aliaslookup("@") == NULL)
- Xsleep(30);
- else
- atcnt = 1;
-
- /*
- ** See if the DBM version of the file is out of date with
- ** the text version. If so, go into 'init' mode automatically.
- ** This only happens if our effective userid owns the DBM.
- ** Note the unpalatable hack to see if the stat succeeded.
- */
-
- modtime = stb.st_mtime;
- (void) strcpy(buf, AliasFile);
- (void) strcat(buf, DB_PAGEXT);
- stb.st_ino = 0;
- if (!init &&
- # ifdef YPMARK
- AliasFile[0] != YPMARK &&
- # endif /* YPMARK */
- (stat(buf, &stb) < 0 || stb.st_mtime < modtime || atcnt < 0))
- {
- errno = 0;
- if (AutoRebuild && stb.st_ino != 0 && stb.st_uid == geteuid())
- {
- init = TRUE;
- automatic = TRUE;
- message(Arpa_Info, "rebuilding alias database");
- # ifdef LOG
- if (LogLevel >= 7)
- syslog(LOG_INFO, "rebuilding alias database");
- # endif /* LOG */
- }
- else
- {
- # ifdef LOG
- if (LogLevel >= 7)
- syslog(LOG_INFO, "alias database out of date");
- # endif /* LOG */
- message(Arpa_Info, "Warning: alias database out of date");
- }
- }
-
- /*
- ** If necessary, load the DBM file.
- ** If running without DBM, load the symbol table.
- */
-
- if (init)
- {
- # ifdef LOG
- if (LogLevel >= 6)
- syslog(LOG_NOTICE, "alias database %srebuilt by %s",
- automatic ? "auto" : "", username());
- # endif /* LOG */
- readaliases(TRUE);
- }
- #else /* !DBM */
- readaliases(init);
- #endif /* DBM */
- }
- /*
- ** READALIASES -- read and process the alias file.
- **
- ** This routine implements the part of initaliases that occurs
- ** when we are not going to use the DBM stuff.
- **
- ** Parameters:
- ** init -- if set, initialize the DBM stuff.
- **
- ** Returns:
- ** none.
- **
- ** Side Effects:
- ** Reads AliasFile into the symbol table.
- ** Optionally, builds the .dir & .pag files.
- */
-
- static void
- readaliases(init)
- bool init;
- {
- register char *p;
- char *rhs;
- bool skipping;
- int naliases, bytes, longest;
- FILE *af;
- SIG_TYPE (*oldsigint)();
- ADDRESS al, bl;
- register STAB *s;
- char line[BUFSIZ];
- char longest_lhs[BUFSIZ];
-
- #ifdef YPMARK
- if (AliasFile[0] == YPMARK)
- {
- if (tTd(27, 1))
- printf("Can't reinit YP databases: \"%s\"\n", AliasFile);
- /* reuse old aliases */
- errno = 0;
- return;
- }
- #endif /* YPMARK */
- /*
- * We can't get an exclusive lock on a file that isn't opened for
- * writing on most systems - sigh!
- */
- if ((af = fopen(AliasFile, "r+")) == NULL)
- {
- if (tTd(27, 1))
- printf("Can't open %s\n", AliasFile);
- errno = 0;
- NoAlias++;
- return;
- }
-
- #ifdef DBM
- /* see if someone else is rebuilding the alias file already */
- if (flock(fileno(af), LOCK_EX | LOCK_NB) < 0 &&
- (errno == EWOULDBLOCK || errno == EAGAIN))
- {
- /* yes, they are -- wait until done and then return */
- message(Arpa_Info, "Alias file is already being rebuilt");
- if (OpMode != MD_INITALIAS)
- {
- /* wait for other rebuild to complete */
- (void) flock(fileno(af), LOCK_EX);
- }
- (void) fclose(af);
- errno = 0;
- return;
- }
- #endif /* DBM */
-
- /*
- ** If initializing, create the new DBM files.
- */
-
- if (init)
- {
- oldsigint = signal(SIGINT, SIG_IGN);
- (void) strcpy(line, AliasFile);
- (void) strcat(line, DB_PAGEXT);
- if (close(creat(line, DBMMODE)) < 0)
- {
- syserr("cannot make %s", line);
- (void) signal(SIGINT, oldsigint);
- return;
- }
- (void) strcpy(line, AliasFile);
- (void) strcat(line, DB_DIREXT);
- if (close(creat(line, DBMMODE)) < 0)
- {
- syserr("cannot make %s", line);
- (void) signal(SIGINT, oldsigint);
- return;
- }
- #if defined(NDBM) || defined(OTHERDBM)
- (void) mapinit(DB_ALIAS);
- #else /* !NDBM && !OTHERDBM */
- dbminit(AliasFile);
- #endif /* NDBM || OTHERDBM */
- }
-
- /*
- ** Read and interpret lines
- */
-
- FileName = AliasFile;
- LineNumber = 0;
- naliases = bytes = longest = 0;
- *longest_lhs = '\0';
- skipping = FALSE;
- while (fgets(line, sizeof (line), af) != NULL)
- {
- int lhssize, rhssize;
-
- LineNumber++;
- p = index(line, '\n');
- if (p != NULL)
- *p = '\0';
- switch (line[0])
- {
- case '#':
- case '\0':
- skipping = FALSE;
- continue;
-
- case ' ':
- case '\t':
- if (!skipping)
- syserr("Non-continuation line starts with space");
- skipping = TRUE;
- continue;
- }
- skipping = FALSE;
-
- /*
- ** Process the LHS
- ** Find the first colon, and parse the address.
- ** It should resolve to a local name -- this will
- ** be checked later (we want to optionally do
- ** parsing of the RHS first to maximize error
- ** detection).
- */
-
- for (p = line; *p != '\0' && *p != ':' && *p != '\n'; p++)
- continue;
- if (*p++ != ':')
- {
- syserr("missing colon");
- continue;
- }
- if (parseaddr(line, &al, 1, ':') == NULL)
- {
- syserr("illegal alias name");
- continue;
- }
- loweraddr(&al);
-
- /*
- ** Process the RHS.
- ** 'al' is the internal form of the LHS address.
- ** 'p' points to the text of the RHS.
- */
-
- rhs = p;
- for (;;)
- {
- register char c;
-
- if (init && CheckAliases)
- {
- /* do parsing & compression of addresses */
- while (*p != '\0')
- {
- extern char *DelimChar;
-
- while (isspace(*p) || *p == ',')
- p++;
- if (*p == '\0')
- break;
- if (parseaddr(p, &bl, -1, ',') == NULL)
- usrerr("%s... bad address", p);
- p = DelimChar;
- }
- }
- else
- {
- p = &p[strlen(p)];
- if (p[-1] == '\n')
- *--p = '\0';
- }
-
- /* see if there should be a continuation line */
- c = fgetc(af);
- if (!feof(af))
- (void) ungetc(c, af);
- if (c != ' ' && c != '\t')
- break;
-
- /* read continuation line */
- if (fgets(p, sizeof line - (p - line), af) == NULL)
- break;
- LineNumber++;
- }
- if (al.q_mailer != LocalMailer)
- {
- syserr("cannot alias non-local names");
- {
- printf("Mailer al.q_mailer:\n");
- print_mailer(al.q_mailer);
- printf("\nMailer LocalMailer:\n");
- print_mailer(LocalMailer);
- }
- continue;
- }
-
- /*
- ** Insert alias into symbol table or DBM file
- */
-
- lhssize = strlen(al.q_user);
- rhssize = strlen(rhs);
- #ifndef NO_PADDING
- lhssize++;
- rhssize++;
- #endif /* !NO_PADDING */
-
- #ifdef DBM
- if (init)
- {
- XDATUM key, content;
-
- key.dsize = lhssize;
- key.dptr = al.q_user;
- content.dsize = rhssize;
- content.dptr = rhs;
- if (
- # if defined(NDBM) || defined(OTHERDBM)
- dbm_store(AliasDbm, key, content, DBM_REPLACE)
- # else /* !NDBM && !OTHERDBM */
- store(key, content)
- # endif /* NDBM || OTHERDBM */
- < 0)
- syserr("DBM store of %s (size %d) failed", al.q_user, (lhssize+rhssize));
- }
- else
- #endif /* DBM */
- {
- s = stab(al.q_user, ST_ALIAS, ST_ENTER);
- s->s_alias = newstr(rhs);
- }
-
- /* statistics */
- naliases++;
- bytes += lhssize + rhssize;
- if ((rhssize + lhssize) > longest)
- {
- longest = rhssize + lhssize;
- (void) strcpy(longest_lhs, al.q_user);
- }
- }
-
- #ifdef DBM
- if (init)
- {
- XDATUM key;
- # ifdef YP
- XDATUM content;
- char Now[MAXHOSTNAMELEN+1];
-
- /* add the YP stamps. N.B., don't pad the lengths by 1! */
- gethostname (Now, MAXHOSTNAMELEN);
- key.dsize = strlen ("YP_MASTER_NAME");
- key.dptr = "YP_MASTER_NAME";
- content.dsize = strlen (Now);
- content.dptr = Now;
- # if defined(NDBM) || defined(OTHERDBM)
- (void) dbm_store(AliasDbm, key, content, DBM_INSERT);
- # else /* !NDBM && !OTHERDBM */
- store(key, content);
- # endif /* NDBM || OTHERDBM */
- (void) sprintf (Now, "%010u", time(0));
- key.dsize = strlen ("YP_LAST_MODIFIED");
- key.dptr = "YP_LAST_MODIFIED";
- content.dsize = strlen (Now);
- content.dptr = Now;
- # if defined(NDBM) || defined(OTHERDBM)
- (void) dbm_store(AliasDbm, key, content, DBM_INSERT);
- # else /* !NDBM && !OTHERDBM */
- store(key, Now);
- # endif /* NDBM || OTHERDBM */
- # endif /* YP */
-
- /* add the distinquished alias "@" */
- key.dsize = 2;
- key.dptr = "@";
- # if defined(NDBM) || defined(OTHERDBM)
- (void) dbm_store(AliasDbm, key, key, DBM_INSERT);
- # else /* !NDBM && !OTHERDBM */
- store(key, key);
- # endif /* NDBM || OTHERDBM */
-
- /* restore the old signal */
- (void) signal(SIGINT, oldsigint);
- }
- #endif /* DBM */
-
- /* closing the alias file drops the lock */
- (void) fclose(af);
- CurEnv->e_to = NULL;
- FileName = NULL;
- message(Arpa_Info, "%d aliases, longest (%s) %d bytes, %d bytes total",
- naliases, longest_lhs, longest, bytes);
- #ifdef LOG
- if (LogLevel >= 8)
- syslog(LOG_INFO, "%d aliases, longest (%s) %d bytes, %d bytes total",
- naliases, longest_lhs, longest, bytes);
- #endif /* LOG */
- }
- /*
- ** FORWARD -- Try to forward mail
- **
- ** This is similar but not identical to aliasing.
- **
- ** Parameters:
- ** user -- the name of the user who's mail we would like
- ** to forward to. It must have been verified --
- ** i.e., the q_home field must have been filled
- ** in.
- ** sendq -- a pointer to the head of the send queue to
- ** put this user's aliases in.
- **
- ** Returns:
- ** none.
- **
- ** Side Effects:
- ** New names are added to send queues.
- */
-
- void
- forward(user, sendq)
- ADDRESS *user;
- ADDRESS **sendq;
- {
- char buf[60];
-
- if (tTd(27, 1))
- printf("forward(%s)\n", user->q_paddr);
-
- if (user->q_mailer != LocalMailer || bitset(QBADADDR, user->q_flags))
- return;
- if (user->q_home == NULL)
- syserr("forward: no home");
-
- /* good address -- look for .forward file in home */
- define('z', user->q_home, CurEnv);
- expand("\001z/.forward", buf, &buf[sizeof buf - 1], CurEnv);
- if (!safefile(buf, user->q_uid, S_IREAD))
- return;
-
- /*
- * we do have an address to forward to -- do it but
- * don't carry over selfref from alias.
- */
- user->q_flags &= ~QSELFREF;
- include(buf, "forwarding", user, sendq);
- }
- /*
- ** PRINT_MAILER -- Print contents of struct mailer
- **
- ** This is for debugging
- **
- ** Parameters:
- ** Mpnt -- pointer to struct mailer
- **
- ** Returns:
- ** none.
- **
- ** Side Effects:
- ** none.
- */
-
- static void
- print_mailer(Mpnt)
- MAILER *Mpnt;
- {
- register int i;
- register char **j;
-
- if (Mpnt == (MAILER *) NULL)
- {
- printf("Null MAILER pointer\n");
- return;
- }
- printf("m_name (symbolic name) %s\n",
- (Mpnt->m_name == (char *)NULL) ? "NULL" : Mpnt->m_name);
- printf("m_mailer (pathname) %s\n",
- (Mpnt->m_mailer == (char *)NULL) ? "NULL" : Mpnt->m_mailer);
- printf("m_flags BITMAP: ");
- for (i = 0; i < (BITMAPBYTES / sizeof (int)); i++)
- printf(" %X", Mpnt->m_flags[i]);
- printf("\n");
- printf("m_mno (internal mailer number) %d\n", (int) Mpnt->m_mno);
- printf("m_argv (template argument vector): ");
- for (j = Mpnt->m_argv; *j != (char *) NULL; j++)
- printf(" \"%s\"", *j);
- printf("\n");
- printf("m_se_rwset (rewriting ruleset for envelope senders): %d\n",
- (int) Mpnt->m_se_rwset);
- printf("m_sh_rwset (rewriting ruleset for header senders): %d\n",
- (int) Mpnt->m_sh_rwset);
- printf("m_re_rwset (rewriting ruleset for envelope recipients): %d\n",
- (int) Mpnt->m_re_rwset);
- printf("m_rh_rwset (rewriting ruleset for header recipient): %d\n",
- (int) Mpnt->m_rh_rwset);
- printf("m_eol (end of line string) %s\n",
- (Mpnt->m_eol == (char *)NULL) ? "NULL" : Mpnt->m_eol);
- printf("m_maxsize (size limit on message to this mailer): %ld\n",
- Mpnt->m_maxsize);
- return;
- }
-