Date: Mon, 27 Aug 2001 04:23:06 -0700 From: Dima Dorfman <dima@unixfreak.org> To: hackers@freebsd.org Subject: syslogd bound to a specific address? Message-ID: <20010827112311.7DD633E31@bazooka.unixfreak.org>
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Is there a compelling reason why syslogd doesn't have an option to
make it bind to a specific address? Most daemons have one, but
syslogd does not. I'm asking because jail(8) explicitly mentions that
syslogd doesn't support this, which either means the author knows why
it can't reasonably support it, or doesn't have the time to write it.
The patch attached below seems to work reasonably well for me. Is
there something I'm missing?
Thanks.
Index: syslogd.8
===================================================================
RCS file: /home/ncvs/src/usr.sbin/syslogd/syslogd.8,v
retrieving revision 1.40
diff -u -r1.40 syslogd.8
--- syslogd.8 2001/08/27 11:04:09 1.40
+++ syslogd.8 2001/08/27 11:11:10
@@ -42,6 +42,7 @@
.Nm
.Op Fl 46Adknsuv
.Op Fl a Ar allowed_peer
+.Op Fl b Ar bind_address
.Op Fl f Ar config_file
.Op Fl m Ar mark_interval
.Op Fl p Ar log_socket
@@ -151,6 +152,10 @@
options are ignored if the
.Fl s
option is also specified.
+.It Fl b Ar bind_address
+Specify one specific IP address or hostname to bind to.
+If a hostname is specified,
+the IPv4 or IPv6 address which corresponds to it is used.
.It Fl d
Put
.Nm
Index: syslogd.c
===================================================================
RCS file: /home/ncvs/src/usr.sbin/syslogd/syslogd.c,v
retrieving revision 1.80
diff -u -r1.80 syslogd.c
--- syslogd.c 2001/07/19 22:04:09 1.80
+++ syslogd.c 2001/08/27 11:11:11
@@ -291,7 +291,7 @@
void die __P((int));
void domark __P((int));
void fprintlog __P((struct filed *, int, char *));
-int* socksetup __P((int));
+int* socksetup __P((int, const char *));
void init __P((int));
void logerror __P((const char *));
void logmsg __P((int, char *, char *, int));
@@ -319,13 +319,15 @@
struct sockaddr_storage frominet;
FILE *fp;
char *p, *hname, line[MAXLINE + 1];
+ const char *bindhostname;
struct timeval tv, *tvp;
struct sigaction sact;
sigset_t mask;
pid_t ppid = 1;
socklen_t len;
- while ((ch = getopt(argc, argv, "46Aa:df:kl:m:np:P:suv")) != -1)
+ bindhostname = NULL;
+ while ((ch = getopt(argc, argv, "46Aa:b:df:kl:m:np:P:suv")) != -1)
switch (ch) {
case '4':
family = PF_INET;
@@ -342,6 +344,9 @@
if (allowaddr(optarg) == -1)
usage();
break;
+ case 'b':
+ bindhostname = optarg;
+ break;
case 'd': /* debug */
Debug++;
break;
@@ -447,7 +452,7 @@
}
}
if (SecureMode <= 1)
- finet = socksetup(family);
+ finet = socksetup(family, bindhostname);
if (finet) {
if (SecureMode) {
@@ -2235,8 +2240,9 @@
}
int *
-socksetup(af)
+socksetup(af, bindhostname)
int af;
+ const char *bindhostname;
{
struct addrinfo hints, *res, *r;
int error, maxs, *s, *socks;
@@ -2245,7 +2251,7 @@
hints.ai_flags = AI_PASSIVE;
hints.ai_family = af;
hints.ai_socktype = SOCK_DGRAM;
- error = getaddrinfo(NULL, "syslog", &hints, &res);
+ error = getaddrinfo(bindhostname, "syslog", &hints, &res);
if (error) {
logerror(gai_strerror(error));
errno = 0;
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