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#21: Reverted [538], reopening

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Erik Ekman 2007-07-12 15:22:32 +00:00
parent e5ee739537
commit e6286cc03c
2 changed files with 13 additions and 21 deletions
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27
src/iodined.c
View file

@ -127,19 +127,10 @@ send_version_response(int fd, version_ack_t ack, uint32_t payload, struct user *
write_dns(fd, &u->q, out, sizeof(out)); write_dns(fd, &u->q, out, sizeof(out));
} }
static int
cmp_remote_ip(int userid, struct query *q) {
struct sockaddr_in *tempin;
tempin = (struct sockaddr_in *) &(q->from);
return memcmp(&(users[userid].host), &(tempin->sin_addr), sizeof(struct in_addr));
}
static int static int
tunnel_dns(int tun_fd, int dns_fd) tunnel_dns(int tun_fd, int dns_fd)
{ {
struct in_addr tempip; struct in_addr tempip;
struct sockaddr_in *tempin;
struct user dummy; struct user dummy;
struct ip *hdr; struct ip *hdr;
unsigned long outlen; unsigned long outlen;
@ -173,10 +164,9 @@ tunnel_dns(int tun_fd, int dns_fd)
userid = find_available_user(); userid = find_available_user();
if (userid >= 0) { if (userid >= 0) {
users[userid].seed = rand(); users[userid].seed = rand();
/* Store remote IP number */ memcpy(&(users[userid].host), &(dummy.q.from), dummy.q.fromlen);
tempin = (struct sockaddr_in *) &(dummy.q.from);
memcpy(&(users[userid].host), &(tempin->sin_addr), sizeof(struct in_addr));
memcpy(&(users[userid].q), &(dummy.q), sizeof(struct query)); memcpy(&(users[userid].q), &(dummy.q), sizeof(struct query));
users[userid].addrlen = dummy.q.fromlen;
users[userid].encoder = get_base32_encoder(); users[userid].encoder = get_base32_encoder();
send_version_response(dns_fd, VERSION_ACK, users[userid].seed, &users[userid]); send_version_response(dns_fd, VERSION_ACK, users[userid].seed, &users[userid]);
users[userid].q.id = 0; users[userid].q.id = 0;
@ -198,7 +188,8 @@ tunnel_dns(int tun_fd, int dns_fd)
users[userid].last_pkt = time(NULL); users[userid].last_pkt = time(NULL);
login_calculate(logindata, 16, password, users[userid].seed); login_calculate(logindata, 16, password, users[userid].seed);
if (cmp_remote_ip(userid, &(dummy.q)) != 0) { if (dummy.q.fromlen != users[userid].addrlen ||
memcmp(&(users[userid].host), &(dummy.q.from), dummy.q.fromlen) != 0) {
write_dns(dns_fd, &(dummy.q), "BADIP", 5); write_dns(dns_fd, &(dummy.q), "BADIP", 5);
} else { } else {
if (read >= 18 && (memcmp(logindata, unpacked+1, 16) == 0)) { if (read >= 18 && (memcmp(logindata, unpacked+1, 16) == 0)) {
@ -229,10 +220,8 @@ tunnel_dns(int tun_fd, int dns_fd)
write_dns(dns_fd, &(dummy.q), "BADIP", 5); write_dns(dns_fd, &(dummy.q), "BADIP", 5);
return 0; /* illegal id */ return 0; /* illegal id */
} }
if (cmp_remote_ip(userid, &(dummy.q)) != 0) {
memcpy(&(users[userid].q), &(dummy.q), sizeof(struct query)); memcpy(&(users[userid].q), &(dummy.q), sizeof(struct query));
users[userid].last_pkt = time(NULL); users[userid].last_pkt = time(NULL);
}
} else if(in[0] == 'Z' || in[0] == 'z') { } else if(in[0] == 'Z' || in[0] == 'z') {
/* Case conservation check */ /* Case conservation check */
@ -256,7 +245,8 @@ tunnel_dns(int tun_fd, int dns_fd)
} }
/* Check sending ip number */ /* Check sending ip number */
if (cmp_remote_ip(userid, &(dummy.q)) != 0) { if (dummy.q.fromlen != users[userid].addrlen ||
memcmp(&(users[userid].host), &(dummy.q.from), dummy.q.fromlen) != 0) {
write_dns(dns_fd, &(dummy.q), "BADIP", 5); write_dns(dns_fd, &(dummy.q), "BADIP", 5);
} else { } else {
/* decode with this users encoding */ /* decode with this users encoding */
@ -265,6 +255,7 @@ tunnel_dns(int tun_fd, int dns_fd)
users[userid].last_pkt = time(NULL); users[userid].last_pkt = time(NULL);
memcpy(&(users[userid].q), &(dummy.q), sizeof(struct query)); memcpy(&(users[userid].q), &(dummy.q), sizeof(struct query));
users[userid].addrlen = dummy.q.fromlen;
memcpy(users[userid].inpacket.data + users[userid].inpacket.offset, unpacked, read); memcpy(users[userid].inpacket.data + users[userid].inpacket.offset, unpacked, read);
users[userid].inpacket.len += read; users[userid].inpacket.len += read;
users[userid].inpacket.offset += read; users[userid].inpacket.offset += read;
@ -293,8 +284,8 @@ tunnel_dns(int tun_fd, int dns_fd)
} }
} }
/* userid must be set for a reply to be sent */ /* userid must be set for a reply to be sent */
if (userid >= 0 && userid < USERS && if (userid >= 0 && userid < USERS && dummy.q.fromlen == users[userid].addrlen &&
cmp_remote_ip(userid, &(dummy.q)) != 0 && memcmp(&(users[userid].host), &(dummy.q.from), dummy.q.fromlen) == 0 &&
users[userid].outpacket.len > 0) { users[userid].outpacket.len > 0) {
write_dns(dns_fd, &(dummy.q), users[userid].outpacket.data, users[userid].outpacket.len); write_dns(dns_fd, &(dummy.q), users[userid].outpacket.data, users[userid].outpacket.len);

3
src/user.h
View file

@ -25,7 +25,8 @@ struct user {
time_t last_pkt; time_t last_pkt;
int seed; int seed;
in_addr_t tun_ip; in_addr_t tun_ip;
struct in_addr host; struct sockaddr host;
int addrlen;
struct query q; struct query q;
struct packet inpacket; struct packet inpacket;
struct packet outpacket; struct packet outpacket;