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/* Syslog listener for systems where /dev/log is a Unix domain socket. */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/time.h>
#include <pwd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/un.h>
#include <errno.h>
#define SIZE 1024
#define SOCKNAME "/dev/log"
#define RUNUSER "daemon"
int main(int argc, char **argv){
char buf[SIZE];
ssize_t r, w;
struct sockaddr_un sa1;
int s1;
fd_set fs;
int fd[2];
pid_t child;
struct passwd *userinfo;
if(argc<2){
fprintf(stderr, "No logger specified\n");
exit(1);
}
/* Assume that it's ok to grab /dev/log. */
if ((s1 = open("/proc/kmsg",O_RDONLY)) == -1) {
perror("/proc/kmsg");
exit(1);
}
/* Dropping privileges here
userinfo=getpwnam(RUNUSER);
if(userinfo){
setuid(userinfo->pw_uid);
seteuid(userinfo->pw_uid);
} else {
fprintf(stderr, "No such user: %s\n", RUNUSER);
exit(1);
}
*/
if(pipe(fd)==-1){
perror("pipe");
exit(1);
}
if((child=fork())==-1){
perror("fork");
exit(1);
}
if(child==0){ /* We are the child */
close(fd[1]); /* Child will only be reading from, not writing to parent */
dup2(fd[0], 0);
/* Execute logger */
//execlp("multilog", "multilog", "/tmp/test", NULL);
argv++;
execvp(argv[0], argv);
}
/* We are Parent */
close(fd[0]); /* Write to the child */
for(;;) {
r = read(s1, buf, SIZE);
if (r < 0) {
if (errno!=EINTR)
perror("read");
continue;
}
while (r) {
w = write(fd[1], buf, r);
if (w < 0) {
if (errno!=EINTR)
perror("write");
exit(1);
}
r -= w;
}
}
}
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