From a114ab3ff9a6c57d9f5e7f9c560990a973309f59 Mon Sep 17 00:00:00 2001 From: Erik Ekman Date: Sat, 1 Dec 2007 23:02:06 +0000 Subject: [PATCH] revert [607], [608] and parts of [611] --- src/iodined.c | 161 ++++++++++++++++++++++---------------------------- 1 file changed, 69 insertions(+), 92 deletions(-) diff --git a/src/iodined.c b/src/iodined.c index 844d705..83ed538 100644 --- a/src/iodined.c +++ b/src/iodined.c @@ -82,8 +82,10 @@ tunnel_tun(int tun_fd, int dns_fd) compress2((uint8_t*)out, &outlen, (uint8_t*)in, read, 9); /* if another packet is queued, throw away this one. TODO build queue */ - if (packet_empty(&(users[userid].outpacket)) == 0) { - return packet_fill(&(users[userid].outpacket), out, outlen); + if (users[userid].outpacket.len == 0) { + memcpy(users[userid].outpacket.data, out, outlen); + users[userid].outpacket.len = outlen; + return outlen; } else { return 0; } @@ -122,103 +124,21 @@ send_version_response(int fd, version_ack_t ack, uint32_t payload, struct user * write_dns(fd, &u->q, out, sizeof(out)); } -static void -handle_version(int dns_fd, char *in, int len) -{ - char unpacked[64*1024]; - struct user dummy; - int read; - int version; - int userid; - - read = unpack_data(unpacked, sizeof(unpacked), &(in[1]), len - 1, b32); - /* Version greeting, compare and send ack/nak */ - if (read > 4) { - /* Received V + 32bits version */ - version = (((unpacked[0] & 0xff) << 24) | - ((unpacked[1] & 0xff) << 16) | - ((unpacked[2] & 0xff) << 8) | - ((unpacked[3] & 0xff))); - } - - if (version == VERSION) { - userid = find_available_user(); - if (userid >= 0) { - users[userid].seed = rand(); - memcpy(&(users[userid].host), &(dummy.q.from), dummy.q.fromlen); - memcpy(&(users[userid].q), &(dummy.q), sizeof(struct query)); - users[userid].addrlen = dummy.q.fromlen; - users[userid].encoder = get_base32_encoder(); - send_version_response(dns_fd, VERSION_ACK, users[userid].seed, &users[userid]); - users[userid].q.id = 0; - } else { - /* No space for another user */ - send_version_response(dns_fd, VERSION_FULL, USERS, &dummy); - } - } else { - send_version_response(dns_fd, VERSION_NACK, VERSION, &dummy); - } -} - -static int -handle_login(int dns_fd, char *in, int len) -{ - char data[64*1024]; - char logindata[16]; - struct in_addr tempip; - char *tmp[2]; - struct user dummy; - int read; - int userid; - - read = unpack_data(data, sizeof(data), &(in[1]), len - 1, b32); - /* Login phase, handle auth */ - userid = data[0]; - if (userid < 0 || userid >= USERS) { - write_dns(dns_fd, &(dummy.q), "BADIP", 5); - return -1; /* illegal id */ - } - users[userid].last_pkt = time(NULL); - login_calculate(logindata, 16, password, users[userid].seed); - - 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); - } else { - if (read >= 18 && (memcmp(logindata, data+1, 16) == 0)) { - /* Login ok, send ip/mtu info */ - - tempip.s_addr = my_ip; - tmp[0] = strdup(inet_ntoa(tempip)); - tempip.s_addr = users[userid].tun_ip; - tmp[1] = strdup(inet_ntoa(tempip)); - - read = snprintf(data, sizeof(data), "%s-%s-%d", - tmp[0], tmp[1], my_mtu); - - write_dns(dns_fd, &(dummy.q), data, read); - dummy.q.id = 0; - - free(tmp[1]); - free(tmp[0]); - } else { - write_dns(dns_fd, &(dummy.q), "LNAK", 4); - } - } - return userid; -} - static int tunnel_dns(int tun_fd, int dns_fd) { + struct in_addr tempip; struct user dummy; struct ip *hdr; unsigned long outlen; + char logindata[16]; char out[64*1024]; char in[64*1024]; char unpacked[64*1024]; + char *tmp[2]; int userid; int touser; + int version; int read; int code; @@ -227,11 +147,68 @@ tunnel_dns(int tun_fd, int dns_fd) return 0; if(in[0] == 'V' || in[0] == 'v') { - handle_version(dns_fd, in, read); + read = unpack_data(unpacked, sizeof(unpacked), &(in[1]), read - 1, b32); + /* Version greeting, compare and send ack/nak */ + if (read > 4) { + /* Received V + 32bits version */ + version = (((unpacked[0] & 0xff) << 24) | + ((unpacked[1] & 0xff) << 16) | + ((unpacked[2] & 0xff) << 8) | + ((unpacked[3] & 0xff))); + } + + if (version == VERSION) { + userid = find_available_user(); + if (userid >= 0) { + users[userid].seed = rand(); + memcpy(&(users[userid].host), &(dummy.q.from), dummy.q.fromlen); + memcpy(&(users[userid].q), &(dummy.q), sizeof(struct query)); + users[userid].addrlen = dummy.q.fromlen; + users[userid].encoder = get_base32_encoder(); + send_version_response(dns_fd, VERSION_ACK, users[userid].seed, &users[userid]); + users[userid].q.id = 0; + } else { + /* No space for another user */ + send_version_response(dns_fd, VERSION_FULL, USERS, &dummy); + } + } else { + send_version_response(dns_fd, VERSION_NACK, VERSION, &dummy); + } } else if(in[0] == 'L' || in[0] == 'l') { - userid = handle_login(dns_fd, in, read); - if (userid == -1) - return 0; /* illegal user id */ + read = unpack_data(unpacked, sizeof(unpacked), &(in[1]), read - 1, b32); + /* Login phase, handle auth */ + userid = unpacked[0]; + if (userid < 0 || userid >= USERS) { + write_dns(dns_fd, &(dummy.q), "BADIP", 5); + return 0; /* illegal id */ + } + users[userid].last_pkt = time(NULL); + login_calculate(logindata, 16, password, users[userid].seed); + + 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); + } else { + if (read >= 18 && (memcmp(logindata, unpacked+1, 16) == 0)) { + /* Login ok, send ip/mtu info */ + + tempip.s_addr = my_ip; + tmp[0] = strdup(inet_ntoa(tempip)); + tempip.s_addr = users[userid].tun_ip; + tmp[1] = strdup(inet_ntoa(tempip)); + + read = snprintf(out, sizeof(out), "%s-%s-%d", + tmp[0], tmp[1], my_mtu); + + write_dns(dns_fd, &(dummy.q), out, read); + dummy.q.id = 0; + + free(tmp[1]); + free(tmp[0]); + } else { + write_dns(dns_fd, &(dummy.q), "LNAK", 4); + } + } } else if(in[0] == 'P' || in[0] == 'p') { read = unpack_data(unpacked, sizeof(unpacked), &(in[1]), read - 1, b32); /* Ping packet, store userid */