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syslogd: do not retry udp sends (can stall syslogd for extended periods

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of time), resolve remote logging host before daemonization
This commit is contained in:
Denis Vlasenko 2006-09-30 19:21:24 +00:00
parent 14c1940255
commit 02be0f5350
1 changed files with 14 additions and 41 deletions
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55
sysklogd/syslogd.c
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@ -52,12 +52,6 @@ static char LocalHostName[64];
static int remotefd = -1;
static struct sockaddr_in remoteaddr;
/* where do we log? */
static char *RemoteHost;
/* what port to log to? */
static int RemotePort = 514;
#endif
/* options */
@ -375,19 +369,6 @@ static void message(char *fmt, ...)
}
}
#ifdef CONFIG_FEATURE_REMOTE_LOG
static void init_RemoteLog(void)
{
memset(&remoteaddr, 0, sizeof(remoteaddr));
remotefd = xsocket(AF_INET, SOCK_DGRAM, 0);
remoteaddr.sin_family = AF_INET;
remoteaddr.sin_addr = *(struct in_addr *) *(xgethostbyname(RemoteHost))->h_addr_list;
remoteaddr.sin_port = htons(RemotePort);
}
#else
void init_RemoteLog(void);
#endif
static void logMessage(int pri, char *msg)
{
time_t now;
@ -427,24 +408,14 @@ static void logMessage(int pri, char *msg)
char line[MAXLINE + 1];
/* trying connect the socket */
if (-1 == remotefd) {
init_RemoteLog();
remotefd = socket(AF_INET, SOCK_DGRAM, 0);
}
/* if we have a valid socket, send the message */
if (-1 != remotefd) {
now = 1;
snprintf(line, sizeof(line), "<%d>%s", pri, msg);
retry:
/* send message to remote logger */
if ((-1 == sendto(remotefd, line, strlen(line), 0,
(struct sockaddr *) &remoteaddr,
sizeof(remoteaddr))) && (errno == EINTR)) {
/* sleep now seconds and retry (with now * 2) */
sleep(now);
now *= 2;
goto retry;
}
/* send message to remote logger, ignore possible error */
sendto(remotefd, line, strlen(line), 0,
(struct sockaddr *) &remoteaddr, sizeof(remoteaddr));
}
}
@ -468,7 +439,7 @@ static void quit_signal(int sig)
if (ENABLE_FEATURE_IPC_SYSLOG)
ipcsyslog_cleanup();
exit(TRUE);
exit(1);
}
static void domark(int sig)
@ -564,10 +535,6 @@ static void doSyslogd(void)
ipcsyslog_init();
}
if (ENABLE_FEATURE_REMOTE_LOG && (option_mask & OPT_remotelog)) {
init_RemoteLog();
}
logMessage(LOG_SYSLOG | LOG_INFO, "syslogd started: " "BusyBox v" BB_VER );
for (;;) {
@ -628,12 +595,18 @@ int syslogd_main(int argc, char **argv)
#endif
#if ENABLE_FEATURE_REMOTE_LOG
if (option_mask & OPT_remotelog) { // -R
RemoteHost = xstrdup(opt_R);
p = strchr(RemoteHost, ':');
int port = 514;
char *host = xstrdup(opt_R);
p = strchr(host, ':');
if (p) {
RemotePort = atoi(p + 1);
port = atoi(p + 1);
*p = '\0';
}
remoteaddr.sin_family = AF_INET;
/* FIXME: looks ip4-specific. need to do better */
remoteaddr.sin_addr = *(struct in_addr *) *(xgethostbyname(host)->h_addr_list);
remoteaddr.sin_port = htons(port);
free(host);
}
//if (option_mask & OPT_locallog) // -L
#endif