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Store only in_addr, not whole sockaddr, fixes #21

This commit is contained in:
Erik Ekman 2007-07-11 18:27:18 +00:00
parent bb74190ed5
commit 639fb5f6aa
2 changed files with 21 additions and 13 deletions
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27
src/iodined.c
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@ -127,10 +127,19 @@ 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;
@ -164,9 +173,10 @@ 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();
memcpy(&(users[userid].host), &(dummy.q.from), dummy.q.fromlen); /* Store remote IP number */
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;
@ -191,8 +201,7 @@ 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 (dummy.q.fromlen != users[userid].addrlen || if (cmp_remote_ip(userid, &(dummy.q)) != 0) {
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)) {
@ -223,8 +232,10 @@ 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] >= '0' && in[0] <= '9') } else if((in[0] >= '0' && in[0] <= '9')
|| (in[0] >= 'a' && in[0] <= 'f') || (in[0] >= 'a' && in[0] <= 'f')
|| (in[0] >= 'A' && in[0] <= 'F')) { || (in[0] >= 'A' && in[0] <= 'F')) {
@ -242,8 +253,7 @@ tunnel_dns(int tun_fd, int dns_fd)
} }
/* Check sending ip number */ /* Check sending ip number */
if (dummy.q.fromlen != users[userid].addrlen || if (cmp_remote_ip(userid, &(dummy.q)) != 0) {
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 */
@ -252,7 +262,6 @@ 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;
@ -281,8 +290,8 @@ 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 && dummy.q.fromlen == users[userid].addrlen && if (userid >= 0 && userid < USERS &&
memcmp(&(users[userid].host), &(dummy.q.from), dummy.q.fromlen) == 0 && cmp_remote_ip(userid, &(dummy.q)) != 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

@ -25,8 +25,7 @@ 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 sockaddr host; struct in_addr host;
int addrlen;
struct query q; struct query q;
struct packet inpacket; struct packet inpacket;
struct packet outpacket; struct packet outpacket;