Benny Prijono | dd859a6 | 2005-11-01 16:42:51 +0000 | [diff] [blame^] | 1 | /* $Header: /pjproject-0.3/pjlib/src/pj/stun_client.c 6 10/14/05 12:26a Bennylp $ */ |
| 2 | /* $Log: /pjproject-0.3/pjlib/src/pj/stun_client.c $ |
| 3 | * |
| 4 | * 6 10/14/05 12:26a Bennylp |
| 5 | * Finished error code framework, some fixes in ioqueue, etc. Pretty |
| 6 | * major. |
| 7 | * |
| 8 | * 5 9/17/05 10:37a Bennylp |
| 9 | * Major reorganization towards version 0.3. |
| 10 | * |
| 11 | */ |
| 12 | #include <pj/stun.h> |
| 13 | #include <pj/pool.h> |
| 14 | #include <pj/log.h> |
| 15 | #include <pj/string.h> |
| 16 | #include <pj/os.h> |
| 17 | #include <pj/sock_select.h> |
| 18 | |
| 19 | enum { MAX_REQUEST = 3 }; |
| 20 | static int stun_timer[] = {1600, 1600, 1600 }; |
| 21 | |
| 22 | #define THIS_FILE "stunclient" |
| 23 | #define LOG_ADDR(addr) pj_inet_ntoa(addr.sin_addr), pj_ntohs(addr.sin_port) |
| 24 | |
| 25 | |
| 26 | PJ_DECL(pj_status_t) pj_stun_get_mapped_addr( pj_pool_factory *pf, |
| 27 | int sock_cnt, pj_sock_t sock[], |
| 28 | const pj_str_t *srv1, int port1, |
| 29 | const pj_str_t *srv2, int port2, |
| 30 | pj_sockaddr_in mapped_addr[]) |
| 31 | { |
| 32 | pj_sockaddr_in srv_addr[2]; |
| 33 | int i, j, rc, send_cnt = 0; |
| 34 | pj_pool_t *pool; |
| 35 | struct { |
| 36 | struct { |
| 37 | pj_uint32_t mapped_addr; |
| 38 | pj_uint32_t mapped_port; |
| 39 | } srv[2]; |
| 40 | } *rec; |
| 41 | void *out_msg; |
| 42 | pj_size_t out_msg_len; |
| 43 | int wait_resp = 0; |
| 44 | int mapped_status = 0; |
| 45 | |
| 46 | PJ_CHECK_STACK(); |
| 47 | |
| 48 | /* Create pool. */ |
| 49 | pool = pj_pool_create(pf, "stun%p", 1024, 1024, NULL); |
| 50 | if (!pool) { |
| 51 | mapped_status = PJ_STUN_ERR_MEMORY; |
| 52 | return -1; |
| 53 | } |
| 54 | |
| 55 | /* Allocate client records */ |
| 56 | rec = pj_pool_calloc(pool, sock_cnt, sizeof(*rec)); |
| 57 | if (!rec) { |
| 58 | mapped_status = PJ_STUN_ERR_MEMORY; |
| 59 | goto on_error; |
| 60 | } |
| 61 | |
| 62 | /* Create the outgoing BIND REQUEST message template */ |
| 63 | rc = pj_stun_create_bind_req( pool, &out_msg, &out_msg_len, 0, 0); |
| 64 | if (rc != 0) { |
| 65 | mapped_status = -1; |
| 66 | goto on_error; |
| 67 | } |
| 68 | |
| 69 | /* Resolve servers. */ |
| 70 | if (pj_sockaddr_in_init(&srv_addr[0], srv1, (pj_uint16_t)port1) != 0) { |
| 71 | mapped_status = PJ_STUN_ERR_RESOLVE; |
| 72 | goto on_error; |
| 73 | } |
| 74 | if (pj_sockaddr_in_init(&srv_addr[1], srv2, (pj_uint16_t)port2) != 0) { |
| 75 | mapped_status = PJ_STUN_ERR_RESOLVE; |
| 76 | goto on_error; |
| 77 | } |
| 78 | |
| 79 | /* Init mapped addresses to zero */ |
| 80 | pj_memset(mapped_addr, 0, sock_cnt * sizeof(pj_sockaddr_in)); |
| 81 | |
| 82 | /* Main retransmission loop. */ |
| 83 | for (send_cnt=0; send_cnt<MAX_REQUEST; ++send_cnt) { |
| 84 | pj_time_val next_tx, now; |
| 85 | pj_fd_set_t r; |
| 86 | int select_rc; |
| 87 | |
| 88 | PJ_LOG(4,(THIS_FILE, "STUN retransmit %d, wait_resp=%d", |
| 89 | send_cnt, wait_resp)); |
| 90 | |
| 91 | PJ_FD_ZERO(&r); |
| 92 | |
| 93 | /* Send messages to servers that has not given us response. */ |
| 94 | for (i=0; i<sock_cnt && mapped_status==0; ++i) { |
| 95 | for (j=0; j<2 && mapped_status==0; ++j) { |
| 96 | pj_stun_msg_hdr *msg_hdr = out_msg; |
| 97 | pj_ssize_t sent_len; |
| 98 | |
| 99 | if (rec[i].srv[j].mapped_port != 0) |
| 100 | continue; |
| 101 | |
| 102 | /* Modify message so that we can distinguish response. */ |
| 103 | msg_hdr->tsx[2] = pj_htonl(i); |
| 104 | msg_hdr->tsx[3] = pj_htonl(j); |
| 105 | |
| 106 | /* Send! */ |
| 107 | sent_len = out_msg_len; |
| 108 | rc = pj_sock_sendto(sock[i], out_msg, &sent_len, 0, |
| 109 | (pj_sockaddr_t*)&srv_addr[j], |
| 110 | sizeof(pj_sockaddr_in)); |
| 111 | if (sent_len != (int)out_msg_len) { |
| 112 | PJ_LOG(4,(THIS_FILE, |
| 113 | "Error sending STUN request to %s:%d", |
| 114 | LOG_ADDR(srv_addr[j]))); |
| 115 | mapped_status = PJ_STUN_ERR_TRANSPORT; |
| 116 | } else { |
| 117 | ++wait_resp; |
| 118 | } |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | /* All requests sent. |
| 123 | * The loop below will wait for responses until all responses have |
| 124 | * been received (i.e. wait_resp==0) or timeout occurs, which then |
| 125 | * we'll go to the next retransmission iteration. |
| 126 | */ |
| 127 | |
| 128 | /* Calculate time of next retransmission. */ |
| 129 | pj_gettimeofday(&next_tx); |
| 130 | next_tx.sec += (stun_timer[send_cnt]/1000); |
| 131 | next_tx.msec += (stun_timer[send_cnt]%1000); |
| 132 | pj_time_val_normalize(&next_tx); |
| 133 | |
| 134 | for (pj_gettimeofday(&now), select_rc=1; |
| 135 | mapped_status==0 && select_rc==1 && wait_resp>0 && PJ_TIME_VAL_LT(now, next_tx); |
| 136 | pj_gettimeofday(&now)) |
| 137 | { |
| 138 | pj_time_val timeout; |
| 139 | |
| 140 | timeout = next_tx; |
| 141 | PJ_TIME_VAL_SUB(timeout, now); |
| 142 | |
| 143 | for (i=0; i<sock_cnt; ++i) { |
| 144 | PJ_FD_SET(sock[i], &r); |
| 145 | } |
| 146 | |
| 147 | select_rc = pj_sock_select(FD_SETSIZE, &r, NULL, NULL, &timeout); |
| 148 | if (select_rc < 1) |
| 149 | continue; |
| 150 | |
| 151 | for (i=0; i<sock_cnt; ++i) { |
| 152 | int sock_idx, srv_idx; |
| 153 | pj_ssize_t len; |
| 154 | pj_stun_msg msg; |
| 155 | pj_sockaddr_in addr; |
| 156 | int addrlen = sizeof(addr); |
| 157 | pj_stun_mapped_addr_attr *attr; |
| 158 | char recv_buf[128]; |
| 159 | |
| 160 | if (!PJ_FD_ISSET(sock[i], &r)) |
| 161 | continue; |
| 162 | |
| 163 | len = sizeof(recv_buf); |
| 164 | pj_sock_recvfrom( sock[i], recv_buf, |
| 165 | &len, 0, |
| 166 | (pj_sockaddr_t*)&addr, |
| 167 | &addrlen); |
| 168 | |
| 169 | --wait_resp; |
| 170 | |
| 171 | if (len < 1) { |
| 172 | mapped_status = PJ_STUN_ERR_TRANSPORT; |
| 173 | continue; |
| 174 | } |
| 175 | |
| 176 | if (pj_stun_parse_msg(recv_buf, len, &msg) != 0) { |
| 177 | PJ_LOG(4,(THIS_FILE, |
| 178 | "Error parsing STUN response from %s:%d", |
| 179 | LOG_ADDR(addr))); |
| 180 | mapped_status = PJ_STUN_ERR_INVALID_MSG; |
| 181 | continue; |
| 182 | } |
| 183 | |
| 184 | sock_idx = pj_ntohl(msg.hdr->tsx[2]); |
| 185 | srv_idx = pj_ntohl(msg.hdr->tsx[3]); |
| 186 | |
| 187 | if (sock_idx<0 || sock_idx>=sock_cnt || srv_idx<0 || srv_idx>=2) { |
| 188 | PJ_LOG(4,(THIS_FILE, |
| 189 | "Invalid transaction ID from %s:%d", |
| 190 | LOG_ADDR(addr))); |
| 191 | mapped_status = PJ_STUN_ERR_INVALID_MSG; |
| 192 | continue; |
| 193 | } |
| 194 | |
| 195 | if (pj_ntohs(msg.hdr->type) != PJ_STUN_BINDING_RESPONSE) { |
| 196 | PJ_LOG(4,(THIS_FILE, |
| 197 | "Non binding response %d from %s:%d", |
| 198 | pj_ntohs(msg.hdr->type), LOG_ADDR(addr))); |
| 199 | mapped_status = PJ_STUN_ERR_INVALID_MSG; |
| 200 | continue; |
| 201 | } |
| 202 | |
| 203 | if (pj_stun_msg_find_attr(&msg, PJ_STUN_ATTR_ERROR_CODE) != NULL) { |
| 204 | PJ_LOG(4,(THIS_FILE, |
| 205 | "Got STUN error attribute from %s:%d", |
| 206 | LOG_ADDR(addr))); |
| 207 | mapped_status = PJ_STUN_ERR_INVALID_MSG; |
| 208 | continue; |
| 209 | } |
| 210 | |
| 211 | attr = (void*)pj_stun_msg_find_attr(&msg, PJ_STUN_ATTR_MAPPED_ADDR); |
| 212 | if (!attr) { |
| 213 | PJ_LOG(4,(THIS_FILE, |
| 214 | "No mapped address in response from %s:%d", |
| 215 | LOG_ADDR(addr))); |
| 216 | mapped_status = PJ_STUN_ERR_INVALID_MSG; |
| 217 | continue; |
| 218 | } |
| 219 | |
| 220 | rec[sock_idx].srv[srv_idx].mapped_addr = attr->addr; |
| 221 | rec[sock_idx].srv[srv_idx].mapped_port = attr->port; |
| 222 | } |
| 223 | } |
| 224 | |
| 225 | /* The best scenario is if all requests have been replied. |
| 226 | * Then we don't need to go to the next retransmission iteration. |
| 227 | */ |
| 228 | if (wait_resp <= 0) |
| 229 | break; |
| 230 | } |
| 231 | |
| 232 | for (i=0; i<sock_cnt && mapped_status==0; ++i) { |
| 233 | if (rec[i].srv[0].mapped_addr == rec[i].srv[1].mapped_addr && |
| 234 | rec[i].srv[0].mapped_port == rec[i].srv[1].mapped_port) |
| 235 | { |
| 236 | mapped_addr[i].sin_family = PJ_AF_INET; |
| 237 | mapped_addr[i].sin_addr.s_addr = rec[i].srv[0].mapped_addr; |
| 238 | mapped_addr[i].sin_port = (pj_uint16_t)rec[i].srv[0].mapped_port; |
| 239 | |
| 240 | if (rec[i].srv[0].mapped_addr == 0 || rec[i].srv[0].mapped_port == 0) { |
| 241 | mapped_status = PJ_STUN_ERR_NO_RESPONSE; |
| 242 | } |
| 243 | } else { |
| 244 | mapped_status = PJ_STUN_ERR_SYMETRIC; |
| 245 | } |
| 246 | } |
| 247 | |
| 248 | pj_pool_release(pool); |
| 249 | |
| 250 | return mapped_status; |
| 251 | |
| 252 | on_error: |
| 253 | if (pool) pj_pool_release(pool); |
| 254 | return -1; |
| 255 | } |
| 256 | |
| 257 | PJ_DEF(const char*) pj_stun_get_err_msg(pj_status_t status) |
| 258 | { |
| 259 | switch (status) { |
| 260 | case 0: return "No error"; |
| 261 | case -1: return "General error"; |
| 262 | case PJ_STUN_ERR_MEMORY: return "Memory allocation failed"; |
| 263 | case PJ_STUN_ERR_RESOLVE: return "Invalid IP or unable to resolve STUN server"; |
| 264 | case PJ_STUN_ERR_TRANSPORT: return "Unable to contact STUN server"; |
| 265 | case PJ_STUN_ERR_INVALID_MSG: return "Invalid response from STUN server"; |
| 266 | case PJ_STUN_ERR_NO_RESPONSE: return "No response from STUN server"; |
| 267 | case PJ_STUN_ERR_SYMETRIC: return "Different mappings are returned from servers"; |
| 268 | } |
| 269 | return "Unknown error"; |
| 270 | } |