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Verify IP, send correct IP and MTU to client

This commit is contained in:
Erik Ekman 2006-06-23 07:58:36 +00:00
parent df8c508f77
commit fa408ad749
2 changed files with 21 additions and 3 deletions
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20
iodined.c
View File

@ -45,6 +45,9 @@ int outid;
struct query q; struct query q;
int my_mtu;
in_addr_t my_ip;
static void static void
sigint(int sig) { sigint(int sig) {
running = 0; running = 0;
@ -56,6 +59,8 @@ tunnel(int tun_fd, int dns_fd)
int i; int i;
int read; int read;
int code; int code;
int ipadder;
struct in_addr nextip;
fd_set fds; fd_set fds;
struct timeval tv; struct timeval tv;
char in[64*1024]; char in[64*1024];
@ -106,7 +111,15 @@ tunnel(int tun_fd, int dns_fd)
continue; continue;
if(in[0] == 'H' || in[0] == 'h') { if(in[0] == 'H' || in[0] == 'h') {
read = snprintf(out, sizeof(out), "%s-%d", "172.30.5.2", 1023); ipadder = htonl(my_ip); // To get the last byte last
if ((ipadder & 0xFF) == 0xFF) {
// IP ends with 255.
ipadder--;
} else {
ipadder++;
}
nextip.s_addr = ntohl(ipadder);
read = snprintf(out, sizeof(out), "%s-%d", inet_ntoa(nextip), my_mtu);
dnsd_send(dns_fd, &q, out, read); dnsd_send(dns_fd, &q, out, read);
q.id = 0; q.id = 0;
} else if((in[0] >= '0' && in[0] <= '9') } else if((in[0] >= '0' && in[0] <= '9')
@ -254,7 +267,10 @@ main(int argc, char **argv)
goto cleanup1; goto cleanup1;
if ((dnsd_fd = open_dns(argv[1], 53)) == -1) if ((dnsd_fd = open_dns(argv[1], 53)) == -1)
goto cleanup2; goto cleanup2;
my_ip = inet_addr(argv[0]);
my_mtu = mtu;
printf("Listening to dns for domain %s\n", argv[1]); printf("Listening to dns for domain %s\n", argv[1]);
if (newroot) { if (newroot) {

4
tun.c
View File

@ -155,7 +155,7 @@ tun_setip(const char *ip)
{ {
char cmdline[512]; char cmdline[512];
if (inet_addr(ip) != 0) { if (inet_addr(ip) != INADDR_NONE) {
snprintf(cmdline, sizeof(cmdline), snprintf(cmdline, sizeof(cmdline),
"/sbin/ifconfig %s %s netmask 255.255.255.0", "/sbin/ifconfig %s %s netmask 255.255.255.0",
if_name, if_name,
@ -176,6 +176,8 @@ tun_setip(const char *ip)
printf("Adding route %s/24 to %s\n", ip, ip); printf("Adding route %s/24 to %s\n", ip, ip);
#endif #endif
return system(cmdline); return system(cmdline);
} else {
printf("Invalid IP: %s!\n", ip);
} }
return 1; return 1;