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Check ip address of incoming packet

This commit is contained in:
Erik Ekman 2006-11-18 16:19:39 +00:00
parent 1c7f63e97a
commit cf3ca7e5d0
1 changed files with 44 additions and 29 deletions
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71
src/iodined.c
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@ -150,26 +150,32 @@ tunnel(int tun_fd, int dns_fd)
dnsd_send(dns_fd, &q, out, 8); dnsd_send(dns_fd, &q, out, 8);
} }
} else if(in[0] == 'L' || in[0] == 'l') { } else if(in[0] == 'L' || in[0] == 'l') {
// Login phase, handle auth // Check sending ip number
login_calculate(logindata, 16, password, seed); if (q.fromlen != u.addrlen ||
if (read >= 17 && (memcmp(logindata, in+1, 16) == 0)) { memcmp(&(u.host), &(q.from), q.fromlen) != 0) {
// Login ok, send ip/mtu info dnsd_send(dns_fd, &q, "BADIP", 5);
myip.s_addr = my_ip;
clientip.s_addr = my_ip + inet_addr("0.0.0.1");
tmp[0] = strdup(inet_ntoa(myip));
tmp[1] = strdup(inet_ntoa(clientip));
read = snprintf(out, sizeof(out), "%s-%s-%d",
tmp[0], tmp[1], my_mtu);
dnsd_send(dns_fd, &q, out, read);
q.id = 0;
free(tmp[1]);
free(tmp[0]);
} else { } else {
dnsd_send(dns_fd, &q, "LNAK", 4); // Login phase, handle auth
login_calculate(logindata, 16, password, seed);
if (read >= 17 && (memcmp(logindata, in+1, 16) == 0)) {
// Login ok, send ip/mtu info
myip.s_addr = my_ip;
clientip.s_addr = my_ip + inet_addr("0.0.0.1");
tmp[0] = strdup(inet_ntoa(myip));
tmp[1] = strdup(inet_ntoa(clientip));
read = snprintf(out, sizeof(out), "%s-%s-%d",
tmp[0], tmp[1], my_mtu);
dnsd_send(dns_fd, &q, out, read);
q.id = 0;
free(tmp[1]);
free(tmp[0]);
} else {
dnsd_send(dns_fd, &q, "LNAK", 4);
}
} }
} 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')
@ -181,20 +187,29 @@ tunnel(int tun_fd, int dns_fd)
if ((in[0] >= 'A' && in[0] <= 'F')) if ((in[0] >= 'A' && in[0] <= 'F'))
code = in[0] - 'A' + 10; code = in[0] - 'A' + 10;
memcpy(packetbuf.data + packetbuf.offset, in + 1, read - 1); // Check sending ip number
packetbuf.len += read - 1; if (q.fromlen != u.addrlen ||
packetbuf.offset += read - 1; memcmp(&(u.host), &(q.from), q.fromlen) != 0) {
dnsd_send(dns_fd, &q, "BADIP", 5);
} else {
memcpy(packetbuf.data + packetbuf.offset, in + 1, read - 1);
packetbuf.len += read - 1;
packetbuf.offset += read - 1;
if (code & 1) { if (code & 1) {
outlen = sizeof(out); outlen = sizeof(out);
uncompress(out, &outlen, packetbuf.data, packetbuf.len); uncompress(out, &outlen, packetbuf.data, packetbuf.len);
write_tun(tun_fd, out, outlen); write_tun(tun_fd, out, outlen);
packetbuf.len = packetbuf.offset = 0; packetbuf.len = packetbuf.offset = 0;
}
} }
} }
if (outpacket.len > 0) { if (q.fromlen == u.addrlen &&
memcmp(&(u.host), &(q.from), q.fromlen) == 0 &&
outpacket.len > 0) {
dnsd_send(dns_fd, &q, outpacket.data, outpacket.len); dnsd_send(dns_fd, &q, outpacket.data, outpacket.len);
outpacket.len = 0; outpacket.len = 0;
q.id = 0; q.id = 0;