mirror of
https://github.com/yarrick/iodine.git
synced 2024-11-30 13:35:09 +00:00
extracted tunnel-code to own functions
This commit is contained in:
Bjorn Andersson
parent
2ee543f053
commit
7207d722b4
@ -17,6 +17,10 @@
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#ifndef __COMMON_H__
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#define __COMMON_H__
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#ifndef MAX
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#define MAX(a,b) ((a)>(b)?(a):(b))
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#endif
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struct packet
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{
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int len;
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@ -36,15 +36,12 @@
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#include "tun.h"
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#include "version.h"
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#ifndef MAX
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#define MAX(a,b) ((a)>(b)?(a):(b))
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#endif
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int running = 1;
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char password[33];
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static void
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sighandler(int sig) {
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sighandler(int sig)
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{
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running = 0;
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}
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@ -319,7 +316,7 @@ main(int argc, char **argv)
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break;
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default:
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usage();
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break;
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/* NOTREACHED */
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}
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}
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231
src/iodined.c
231
src/iodined.c
@ -38,10 +38,6 @@
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#include "tun.h"
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#include "version.h"
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#ifndef MAX
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#define MAX(a,b) ((a)>(b)?(a):(b))
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#endif
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int running = 1;
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struct packet packetbuf;
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@ -59,27 +55,145 @@ in_addr_t my_ip;
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static int read_dns(int, struct query *, char *, int);
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static void
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sigint(int sig) {
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sigint(int sig)
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{
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running = 0;
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}
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static int
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tunnel(int tun_fd, int dns_fd)
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tunnel_tun(int tun_fd, int dns_fd)
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{
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char out[64*1024];
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char in[64*1024];
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long outlen;
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int read;
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if ((read = read_tun(tun_fd, in, sizeof(in))) <= 0)
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return 0;
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outlen = sizeof(out);
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compress2(out, &outlen, in, read, 9);
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memcpy(outpacket.data, out, outlen);
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outpacket.len = outlen;
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return outlen;
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}
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static int
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tunnel_dns(int tun_fd, int dns_fd)
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{
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struct in_addr clientip;
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struct in_addr myip;
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struct timeval tv;
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char out[64*1024];
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char in[64*1024];
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char *tmp[2];
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char logindata[16];
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long outlen;
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fd_set fds;
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int read;
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int code;
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int version;
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int seed;
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int nseed;
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if ((read = read_dns(dns_fd, &q, in, sizeof(in))) <= 0)
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return 0;
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if(in[0] == 'V' || in[0] == 'v') {
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/* Version greeting, compare and send ack/nak */
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if (read >= 5) {
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/* Received V + 32bits version */
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memcpy(&version, in + 1, 4);
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version = ntohl(version);
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if (version == VERSION) {
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seed = rand();
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nseed = htonl(seed);
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strncpy(out, "VACK", sizeof(out));
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memcpy(out+4, &nseed, 4);
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dnsd_send(dns_fd, &q, out, 8);
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} else {
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version = htonl(VERSION);
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strncpy(out, "VNAK", sizeof(out));
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memcpy(out+4, &version, 4);
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dnsd_send(dns_fd, &q, out, 8);
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}
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} else {
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version = htonl(VERSION);
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strncpy(out, "VNAK", sizeof(out));
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memcpy(out+4, &version, 4);
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dnsd_send(dns_fd, &q, out, 8);
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}
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} else if(in[0] == 'L' || in[0] == 'l') {
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/* Login phase, handle auth */
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login_calculate(logindata, 16, password, seed);
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if (read >= 17 && (memcmp(logindata, in+1, 16) == 0)) {
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/* Login ok, send ip/mtu info */
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myip.s_addr = my_ip;
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clientip.s_addr = my_ip + inet_addr("0.0.0.1");
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tmp[0] = strdup(inet_ntoa(myip));
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tmp[1] = strdup(inet_ntoa(clientip));
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read = snprintf(out, sizeof(out), "%s-%s-%d",
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tmp[0], tmp[1], my_mtu);
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/* Store user ip */
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memcpy(&(u.host), &(q.from), q.fromlen);
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u.addrlen = q.fromlen;
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dnsd_send(dns_fd, &q, out, read);
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q.id = 0;
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free(tmp[1]);
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free(tmp[0]);
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} else {
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dnsd_send(dns_fd, &q, "LNAK", 4);
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}
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} else if((in[0] >= '0' && in[0] <= '9')
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|| (in[0] >= 'a' && in[0] <= 'f')
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|| (in[0] >= 'A' && in[0] <= 'F')) {
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if ((in[0] >= '0' && in[0] <= '9'))
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code = in[0] - '0';
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if ((in[0] >= 'a' && in[0] <= 'f'))
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code = in[0] - 'a' + 10;
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if ((in[0] >= 'A' && in[0] <= 'F'))
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code = in[0] - 'A' + 10;
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/* Check sending ip number */
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if (q.fromlen != u.addrlen ||
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memcmp(&(u.host), &(q.from), q.fromlen) != 0) {
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dnsd_send(dns_fd, &q, "BADIP", 5);
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} else {
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memcpy(packetbuf.data + packetbuf.offset, in + 1, read - 1);
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packetbuf.len += read - 1;
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packetbuf.offset += read - 1;
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if (code & 1) {
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outlen = sizeof(out);
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uncompress(out, &outlen, packetbuf.data, packetbuf.len);
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write_tun(tun_fd, out, outlen);
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packetbuf.len = packetbuf.offset = 0;
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}
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}
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}
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if (q.fromlen == u.addrlen &&
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memcmp(&(u.host), &(q.from), q.fromlen) == 0 &&
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outpacket.len > 0) {
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dnsd_send(dns_fd, &q, outpacket.data, outpacket.len);
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outpacket.len = 0;
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q.id = 0;
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}
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return 0;
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}
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static int
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tunnel(int tun_fd, int dns_fd)
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{
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struct timeval tv;
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fd_set fds;
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int i;
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while (running) {
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@ -112,106 +226,12 @@ tunnel(int tun_fd, int dns_fd)
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}
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} else {
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if(FD_ISSET(tun_fd, &fds)) {
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read = read_tun(tun_fd, in, sizeof(in));
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if (read <= 0)
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tunnel_tun(tun_fd, dns_fd);
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continue;
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outlen = sizeof(out);
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compress2(out, &outlen, in, read, 9);
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memcpy(outpacket.data, out, outlen);
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outpacket.len = outlen;
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}
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if(FD_ISSET(dns_fd, &fds)) {
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read = read_dns(dns_fd, &q, in, sizeof(in));
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if (read <= 0)
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tunnel_dns(tun_fd, dns_fd);
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continue;
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if(in[0] == 'V' || in[0] == 'v') {
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// Version greeting, compare and send ack/nak
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if (read >= 5) { // Received V + 32bits version
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memcpy(&version, in + 1, 4);
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version = ntohl(version);
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if (version == VERSION) {
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seed = rand();
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nseed = htonl(seed);
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strncpy(out, "VACK", sizeof(out));
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memcpy(out+4, &nseed, 4);
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dnsd_send(dns_fd, &q, out, 8);
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} else {
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version = htonl(VERSION);
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strncpy(out, "VNAK", sizeof(out));
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memcpy(out+4, &version, 4);
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dnsd_send(dns_fd, &q, out, 8);
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}
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} else {
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version = htonl(VERSION);
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strncpy(out, "VNAK", sizeof(out));
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memcpy(out+4, &version, 4);
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dnsd_send(dns_fd, &q, out, 8);
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}
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} else if(in[0] == 'L' || in[0] == 'l') {
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// Login phase, handle auth
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login_calculate(logindata, 16, password, seed);
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if (read >= 17 && (memcmp(logindata, in+1, 16) == 0)) {
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// Login ok, send ip/mtu info
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myip.s_addr = my_ip;
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clientip.s_addr = my_ip + inet_addr("0.0.0.1");
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tmp[0] = strdup(inet_ntoa(myip));
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tmp[1] = strdup(inet_ntoa(clientip));
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read = snprintf(out, sizeof(out), "%s-%s-%d",
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tmp[0], tmp[1], my_mtu);
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// Store user ip
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memcpy(&(u.host), &(q.from), q.fromlen);
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u.addrlen = q.fromlen;
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dnsd_send(dns_fd, &q, out, read);
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q.id = 0;
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free(tmp[1]);
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free(tmp[0]);
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} else {
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dnsd_send(dns_fd, &q, "LNAK", 4);
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}
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} else if((in[0] >= '0' && in[0] <= '9')
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|| (in[0] >= 'a' && in[0] <= 'f')
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|| (in[0] >= 'A' && in[0] <= 'F')) {
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if ((in[0] >= '0' && in[0] <= '9'))
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code = in[0] - '0';
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if ((in[0] >= 'a' && in[0] <= 'f'))
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code = in[0] - 'a' + 10;
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if ((in[0] >= 'A' && in[0] <= 'F'))
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code = in[0] - 'A' + 10;
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// Check sending ip number
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if (q.fromlen != u.addrlen ||
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memcmp(&(u.host), &(q.from), q.fromlen) != 0) {
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dnsd_send(dns_fd, &q, "BADIP", 5);
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} else {
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memcpy(packetbuf.data + packetbuf.offset, in + 1, read - 1);
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packetbuf.len += read - 1;
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packetbuf.offset += read - 1;
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if (code & 1) {
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outlen = sizeof(out);
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uncompress(out, &outlen, packetbuf.data, packetbuf.len);
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write_tun(tun_fd, out, outlen);
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packetbuf.len = packetbuf.offset = 0;
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}
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}
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}
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if (q.fromlen == u.addrlen &&
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memcmp(&(u.host), &(q.from), q.fromlen) == 0 &&
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outpacket.len > 0) {
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dnsd_send(dns_fd, &q, outpacket.data, outpacket.len);
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outpacket.len = 0;
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q.id = 0;
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}
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}
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}
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}
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@ -238,7 +258,8 @@ read_dns(int fd, struct query *q, char *buf, int buflen)
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q->fromlen = addrlen;
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memcpy((struct sockaddr*)&q->from, (struct sockaddr*)&from, addrlen);
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rv = len;
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} else if (r < 0) { // Error
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} else if (r < 0) {
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/* Error */
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perror("recvfrom");
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rv = 0;
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}
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