/* -*-c-*-
*
- * $Id: fw.c,v 1.14 2003/01/24 20:12:40 mdw Exp $
+ * $Id$
*
* Port forwarding thingy
*
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
-/*----- Revision history --------------------------------------------------*
- *
- * $Log: fw.c,v $
- * Revision 1.14 2003/01/24 20:12:40 mdw
- * Correctly cast uid and gid sentinel values.
- *
- * Revision 1.13 2002/02/22 23:45:20 mdw
- * Add option to change the listen(2) parameter. Receive `fw'-specific
- * code from `conf.c'.
- *
- * Revision 1.12 2002/01/13 14:49:17 mdw
- * Track @dstr_vputf@ change.
- *
- * Revision 1.11 2001/02/03 20:33:26 mdw
- * Fix flags to be unsigned.
- *
- * Revision 1.10 2001/02/03 20:30:03 mdw
- * Support re-reading config files on SIGHUP.
- *
- * Revision 1.9 2001/01/20 11:55:17 mdw
- * Handle select errors more robustly.
- *
- * Revision 1.8 2000/03/23 23:19:19 mdw
- * Fix changed options in parser table.
- *
- * Revision 1.7 2000/03/23 00:37:33 mdw
- * Add option to change user and group after initialization. Naughtily
- * reassign short equivalents of --grammar and --options.
- *
- * Revision 1.6 1999/12/22 15:44:10 mdw
- * Make syslog a separate option, and do it better.
- *
- * Revision 1.5 1999/10/22 22:47:50 mdw
- * Grammar changes. Also, don't enable SIGINT if it's currently ignored.
- *
- * Revision 1.4 1999/10/10 16:46:12 mdw
- * New resolver to initialize. Also, include options for grammar and
- * options references.
- *
- * Revision 1.3 1999/07/26 23:30:42 mdw
- * Major reconstruction work for new design.
- *
- * Revision 1.2 1999/07/03 13:55:17 mdw
- * Various changes. Add configuration grammar to help text. Change to
- * root directory and open syslog when forking into background.
- *
- * Revision 1.1.1.1 1999/07/01 08:56:23 mdw
- * Initial revision.
- *
- */
-
/*----- Header files ------------------------------------------------------*/
#include "config.h"
#include "fattr.h"
#include "file.h"
#include "fw.h"
+#include "privconn.h"
#include "scan.h"
#include "socket.h"
#include "source.h"
/* --- Combine the source and target --- */
s->ops->attach(s, sc, t);
+ if (t->ops->confirm)
+ t->ops->confirm(t);
}
/* --- Include configuration from a file --- *
static void usage(FILE *fp)
{
- pquis(fp, "Usage: $ [-dql] [-f file] [config statements...]\n");
+ pquis(fp, "Usage: $ [-dql] [-p PIDFILE] [-f FILE] [CONFIG-STMTS...]\n");
}
static void help(FILE *fp)
usage(fp);
pquis(fp, "\n\
An excessively full-featured port-forwarder, which subsumes large chunks\n\
-of the functionality of inetd, netcat, and normal cat. Options available\n\
-are:\n\
-\n\
--h, --help Display this help message.\n\
--v, --version Display the program's version number.\n\
--u, --usage Display a terse usage summary.\n\
-\n\
--G, --grammar Show a summary of the configuration language.\n\
--O, --options Show a summary of the source and target options.\n\
-\n\
--f, --file=FILE Read configuration from a file.\n\
--q, --quiet Don't emit any logging information.\n\
--d, --daemon Fork into background after initializing.\n\
--l, --syslog Send log output to the system logger.\n\
--s, --setuid=USER Change uid to USER after initializing sources.\n\
--g, --setgid=GRP Change gid to GRP after initializing sources.\n\
+of the functionality of inetd, netcat, and normal cat.\n\
\n\
Configuration may be supplied in one or more configuration files, or on\n\
the command line (or both). If no `-f' option is present, and no\n\
\n\
The grammar is fairly complicated. For a summary, run `$ --grammar'.\n\
For a summary of the various options, run `$ --options'.\n\
+\n\
+Options available are:\n\
+\n\
+Help options:\n\
+ -h, --help Display this help message.\n\
+ -v, --version Display the program's version number.\n\
+ -u, --usage Display a terse usage summary.\n\
+\n\
+Configuration summary:\n\
+ -G, --grammar Show a summary of the configuration language.\n\
+ -O, --options Show a summary of the source and target options.\n\
+\n\
+Other options:\n\
+ -f, --file=FILE Read configuration from a file.\n\
+ -q, --quiet Don't emit any logging information.\n\
+ -d, --daemon Fork into background after initializing.\n\
+ -p, --pidfile=FILE Write process-id to the named FILE.\n\
+ -l, --syslog Send log output to the system logger.\n\
+ -s, --setuid=USER Change uid to USER after initializing sources.\n\
+ -g, --setgid=GRP Change gid to GRP after initializing sources.\n\
");
}
Grammar summary\n\
\n\
Basic syntax\n\
- file ::= empty | file stmt [`;']\n\
- stmt ::= option-stmt | fw-stmt\n\
- fw-stmt ::= `fw' source options [`to'|`->'] target options\n\
- options ::= `{' option-seq `}'\n\
- option-seq ::= empty | option-stmt [`;'] option-seq\n\
+ FILE ::= EMPTY | FILE STMT [`;']\n\
+ STMT ::= OPTION-STMT | FW-STMT\n\
+ FW-STMT ::= `fw' SOURCE OPTIONS [`to'|`->'] TARGET OPTIONS\n\
+ OPTIONS ::= `{' OPTION-SEQ `}'\n\
+ OPTION-SEQ ::= EMPTY | OPTION-STMT [`;'] OPTION-SEQ\n\
\n\
Option syntax\n\
- option-stmt ::= q-option\n\
- q-option ::= option\n\
- | prefix `.' q-option\n\
- | prefix `{' option-seq `}'\n\
- prefix ::= word\n\
+ OPTION-STMT ::= Q-OPTION\n\
+ Q-OPTION ::= OPTION\n\
+ | PREFIX `.' Q-OPTION\n\
+ | PREFIX `{' OPTION-SEQ `}'\n\
+ PREFIX ::= WORD\n\
\n\
File source and target\n\
- source ::= file\n\
- target ::= file\n\
- file ::= `file' [`.'] fspec [`,' fspec]\n\
- fspec ::= fd-spec | name-spec | null-spec\n\
- fd-spec ::= [[`:']`fd'[`:']] number|`stdin'|`stdout'\n\
- name-spec ::= [[`:']`file'[`:']] file-name\n\
- file-name ::= path-seq | [ path-seq ]\n\
- path-seq ::= path-elt | path-seq path-elt\n\
- path-elt ::= `/' | word\n\
- null-spec ::= [`:']`null'[`:']\n\
+ SOURCE ::= FILE\n\
+ TARGET ::= FILE\n\
+ FILE ::= `file' [`.'] FSPEC [`,' FSPEC]\n\
+ FSPEC ::= FD-SPEC | NAME-SPEC | NULL-SPEC\n\
+ FD-SPEC ::= [[`:']`fd'[`:']] NUMBER|`stdin'|`stdout'\n\
+ NAME-SPEC ::= [[`:']`name'[`:']] FILE-NAME\n\
+ FILE-NAME ::= PATH-SEQ | [ PATH-SEQ ]\n\
+ PATH-SEQ ::= PATH-ELT | PATH-SEQ PATH-ELT\n\
+ PATH-ELT ::= `/' | WORD\n\
+ NULL-SPEC ::= [`:']`null'[`:']\n\
\n\
Exec source and target\n\
- source ::= exec\n\
- target ::= exec\n\
- exec ::= `exec' [`.'] cmd-spec\n\
- cmd-spec ::= shell-cmd | [prog-name] `[' argv0 arg-seq `]'\n\
- arg-seq ::= word | arg-seq word\n\
- shell-cmd ::= word\n\
- argv0 ::= word\n\
+ SOURCE ::= EXEC\n\
+ TARGET ::= EXEC\n\
+ EXEC ::= `exec' [`.'] CMD-SPEC\n\
+ CMD-SPEC ::= SHELL-CMD | [PROG-NAME] `[' ARGV0 ARG-SEQ `]'\n\
+ ARG-SEQ ::= WORD | ARG-SEQ WORD\n\
+ SHELL-CMD ::= WORD\n\
+ ARGV0 ::= WORD\n\
\n\
Socket source and target\n\
- source ::= socket-source\n\
- target ::= socket-target\n\
- socket-source ::= [`socket'[`.']] [[`:']addr-type[`:']] source-addr\n\
- socket-target ::= [`socket'[`.']] [[`:']addr-type[`:']] target-addr\n\
+ SOURCE ::= SOCKET-SOURCE\n\
+ TARGET ::= SOCKET-TARGET\n\
+ SOCKET-SOURCE ::= [`socket'[`.']] [[`:']ADDR-TYPE[`:']] SOURCE-ADDR\n\
+ SOCKET-TARGET ::= [`socket'[`.']] [[`:']ADDR-TYPE[`:']] TARGET-ADDR\n\
\n\
- inet-source-addr ::= [port] port\n\
- inet-target-addr ::= address [`:'] port\n\
- address ::= addr-elt | address addr-elt\n\
- addr-elt ::= `.' | word\n\
+ INET-SOURCE-ADDR ::= [`port'] PORT\n\
+ INET-TARGET-ADDR ::= ADDRESS [`:'] PORT\n\
+ ADDRESS ::= ADDR-ELT | ADDRESS ADDR-ELT\n\
+ ADDR-ELT ::= `.' | WORD\n\
\n\
- unix-source-addr ::= file-name\n\
- unix-target-addr ::= file-name\n\
+ UNIX-SOURCE-ADDR ::= FILE-NAME\n\
+ UNIX-TARGET-ADDR ::= FILE-NAME\n\
");
}
Options summary\n\
\n\
File attributes (`fattr')\n\
- prefix.fattr.mode [=] mode\n\
- prefix.fattr.owner [=] user\n\
- prefix.fattr.group [=] group\n\
+ prefix.FATTR.MODE [=] MODE\n\
+ prefix.FATTR.OWNER [=] USER\n\
+ prefix.FATTR.GROUP [=] GROUP\n\
\n\
File options\n\
file.create [=] yes|no\n\
\n\
Exec options\n\
exec.logging [=] yes|no\n\
- exec.dir [=] file-name\n\
- exec.root [=] file-name\n\
- exec.user [=] user\n\
- exec.group [=] group\n\
- exec.rlimit.limit[.hard|.soft] [=] value\n\
+ exec.dir [=] FILE-NAME\n\
+ exec.root [=] FILE-NAME\n\
+ exec.user [=] USER\n\
+ exec.group [=] GROUP\n\
+ exec.rlimit.LIMIT[.hard|.soft] [=] VALUE\n\
exec.env.clear\n\
- exec.env.unset var\n\
- exec.env.[set] var [=] value\n\
+ exec.env.unset VAR\n\
+ exec.env.[set] VAR [=] VALUE\n\
\n\
Socket options\n\
- socket.conn [=] number|unlimited|one-shot\n\
- socket.listen [=] number\n\
+ socket.conn [=] NUMBER|unlimited|one-shot\n\
+ socket.listen [=] NUMBER\n\
socket.logging [=] yes|no\n\
\n\
- socket.inet.[allow|deny] [from] address [/ address]\n\
+ socket.inet.source.[allow|deny] [host] ADDR [/ ADDR]\n\
+ socket.inet.source.[allow|deny] priv-port\n\
+ socket.inet.source.addr [=] any|ADDR\n\
+ socket.inet.dest.addr [=] any|ADDR\n\
+ socket.inet.dest.priv-port [=] yes|no\n\
\n\
socket.unix.fattr.*\n\
");
scanner sc;
uid_t drop = -1;
gid_t dropg = -1;
+ const char *pidfile = 0;
conffile *cf, **cff = &conffiles;
#define f_bogus 1u
{ "file", OPTF_ARGREQ, 0, 'f' },
{ "fork", 0, 0, 'd' },
{ "daemon", 0, 0, 'd' },
+ { "pidfile", OPTF_ARGREQ, 0, 'p' },
{ "syslog", 0, 0, 'l' },
{ "log", 0, 0, 'l' },
{ "quiet", 0, 0, 'q' },
{ 0, 0, 0, 0 }
};
- int i = mdwopt(argc, argv, "+hvu GO f:dls:g:", opts, 0, 0, 0);
+ int i = mdwopt(argc, argv, "+hvu" "GO" "f:dp:ls:g:", opts, 0, 0, 0);
if (i < 0)
break;
case 'd':
f |= f_fork;
break;
+ case 'p':
+ pidfile = optarg;
+ break;
case 'l':
f |= f_syslog;
break;
/* --- Drop privileges --- */
+ if (drop != (uid_t)-1)
+ privconn_split(sel);
#ifdef HAVE_SETGROUPS
if ((dropg != (gid_t)-1 && (setgid(dropg) || setgroups(1, &dropg))) ||
(drop != (uid_t)-1 && setuid(drop)))
if (kid != 0)
_exit(0);
}
+ if (pidfile) {
+ FILE *fp = fopen(pidfile, "w");
+ if (!fp) {
+ die(EXIT_FAILURE, "couldn't create pidfile `%s': %s",
+ pidfile, strerror(errno));
+ }
+ fprintf(fp, "%lu\n", (unsigned long)getpid());
+ if (fflush(fp) || ferror(fp) || fclose(fp)) {
+ die(EXIT_FAILURE, "couldn't write pidfile `%s': %s",
+ pidfile, strerror(errno));
+ }
+ }
if (f & f_syslog) {
flags |= FW_SYSLOG;
~mdw / fwd / blobdiff