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Added setuid/gid and getopt parsing of -u user

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This commit is contained in:
Erik Ekman 2006-06-09 20:35:26 +00:00
parent 7782693e2b
commit 12d79f6e25
2 changed files with 83 additions and 8 deletions
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46
dnstun.c
View File

@ -24,6 +24,7 @@
#include <sys/stat.h>
#include <fcntl.h>
#include <err.h>
#include <pwd.h>
#include <arpa/inet.h>
#include <zlib.h>
@ -115,22 +116,59 @@ tunnel(int tun_fd, int dns_fd)
return 0;
}
static void
usage() {
printf("Usage: dnstun [-u user] nameserver topdomain\n");
exit(2);
}
int
main(int argc, char **argv)
{
int tun_fd;
int dns_fd;
int choice;
char *username;
struct passwd *pw;
if (argc != 3) {
printf("Usage: %s nameserver topdomain\n", argv[0]);
exit(2);
username = NULL;
while ((choice = getopt(argc, argv, "u:")) != -1) {
switch(choice) {
case 'u':
username = optarg;
pw = getpwnam(username);
if (!pw) {
printf("User %s does not exist!\n", username);
usage();
}
break;
default:
usage();
break;
}
}
argc -= optind;
argv += optind;
if (argc != 2) {
usage();
}
tun_fd = open_tun();
dns_fd = open_dns(argv[1], argv[2]);
dns_fd = open_dns(argv[0], argv[1]);
printf("Sending queries for %s to %s\n", argv[1], argv[0]);
signal(SIGINT, sigint);
if (username) {
if (setgid(pw->pw_gid) < 0 || setuid(pw->pw_uid) < 0) {
printf("Could not switch to user %s!\n", username);
usage();
}
printf("Now running as user %s\n", username);
}
tunnel(tun_fd, dns_fd);
printf("Closing tunnel\n");

45
dnstund.c
View File

@ -24,6 +24,7 @@
#include <sys/stat.h>
#include <fcntl.h>
#include <err.h>
#include <pwd.h>
#include <arpa/inet.h>
#include <zlib.h>
@ -112,21 +113,57 @@ tunnel(int tun_fd, int dns_fd)
return 0;
}
static void
usage() {
printf("Usage: dnstund [-u user] topdomain\n");
exit(2);
}
int
main(int argc, char **argv)
{
int tun_fd;
int dnsd_fd;
int choice;
char *username;
struct passwd *pw;
if (argc != 2) {
printf("Usage: %s topdomain\n", argv[0]);
exit(2);
username = NULL;
while ((choice = getopt(argc, argv, "u:")) != -1) {
switch(choice) {
case 'u':
username = optarg;
pw = getpwnam(username);
if (!pw) {
printf("User %s does not exist!\n", username);
usage();
}
break;
default:
usage();
break;
}
}
argc -= optind;
argv += optind;
if (argc != 1) {
usage();
}
tun_fd = open_tun();
dnsd_fd = open_dnsd(argv[1]);
dnsd_fd = open_dnsd(argv[0]);
printf("Listening to dns for domain %s\n", argv[0]);
signal(SIGINT, sigint);
if (username) {
if (setgid(pw->pw_gid) < 0 || setuid(pw->pw_uid) < 0) {
printf("Could not switch to user %s!\n", username);
usage();
}
printf("Now running as user %s\n", username);
}
tunnel(tun_fd, dnsd_fd);