1 /* 2 * http_server - HTTP server 3 * Copyright (c) 2009, Jouni Malinen <j (at) w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #include "includes.h" 10 #include <fcntl.h> 11 12 #include "common.h" 13 #include "eloop.h" 14 #include "httpread.h" 15 #include "http_server.h" 16 17 #define HTTP_SERVER_TIMEOUT 30 18 #define HTTP_SERVER_MAX_REQ_LEN 8000 19 #define HTTP_SERVER_MAX_CONNECTIONS 10 20 21 struct http_request { 22 struct http_request *next; 23 struct http_server *srv; 24 int fd; 25 struct sockaddr_in cli; 26 struct httpread *hread; 27 }; 28 29 struct http_server { 30 void (*cb)(void *ctx, struct http_request *req); 31 void *cb_ctx; 32 33 int fd; 34 int port; 35 36 struct http_request *requests; 37 unsigned int request_count; 38 }; 39 40 41 static void http_request_cb(struct httpread *handle, void *cookie, 42 enum httpread_event en) 43 { 44 struct http_request *req = cookie; 45 struct http_server *srv = req->srv; 46 47 if (en == HTTPREAD_EVENT_FILE_READY) { 48 wpa_printf(MSG_DEBUG, "HTTP: Request from %s:%d received", 49 inet_ntoa(req->cli.sin_addr), 50 ntohs(req->cli.sin_port)); 51 srv->cb(srv->cb_ctx, req); 52 return; 53 } 54 wpa_printf(MSG_DEBUG, "HTTP: Request from %s:%d could not be received " 55 "completely", inet_ntoa(req->cli.sin_addr), 56 ntohs(req->cli.sin_port)); 57 http_request_deinit(req); 58 } 59 60 61 static struct http_request * http_request_init(struct http_server *srv, int fd, 62 struct sockaddr_in *cli) 63 { 64 struct http_request *req; 65 66 if (srv->request_count >= HTTP_SERVER_MAX_CONNECTIONS) { 67 wpa_printf(MSG_DEBUG, "HTTP: Too many concurrent requests"); 68 return NULL; 69 } 70 71 req = os_zalloc(sizeof(*req)); 72 if (req == NULL) 73 return NULL; 74 75 req->srv = srv; 76 req->fd = fd; 77 req->cli = *cli; 78 79 req->hread = httpread_create(req->fd, http_request_cb, req, 80 HTTP_SERVER_MAX_REQ_LEN, 81 HTTP_SERVER_TIMEOUT); 82 if (req->hread == NULL) { 83 http_request_deinit(req); 84 return NULL; 85 } 86 87 return req; 88 } 89 90 91 void http_request_deinit(struct http_request *req) 92 { 93 struct http_request *r, *p; 94 struct http_server *srv; 95 96 if (req == NULL) 97 return; 98 99 srv = req->srv; 100 p = NULL; 101 r = srv->requests; 102 while (r) { 103 if (r == req) { 104 if (p) 105 p->next = r->next; 106 else 107 srv->requests = r->next; 108 srv->request_count--; 109 break; 110 } 111 p = r; 112 r = r->next; 113 } 114 115 httpread_destroy(req->hread); 116 close(req->fd); 117 os_free(req); 118 } 119 120 121 static void http_request_free_all(struct http_request *req) 122 { 123 struct http_request *prev; 124 while (req) { 125 prev = req; 126 req = req->next; 127 http_request_deinit(prev); 128 } 129 } 130 131 132 void http_request_send(struct http_request *req, struct wpabuf *resp) 133 { 134 int res; 135 136 wpa_printf(MSG_DEBUG, "HTTP: Send %lu byte response to %s:%d", 137 (unsigned long) wpabuf_len(resp), 138 inet_ntoa(req->cli.sin_addr), 139 ntohs(req->cli.sin_port)); 140 141 res = send(req->fd, wpabuf_head(resp), wpabuf_len(resp), 0); 142 if (res < 0) { 143 wpa_printf(MSG_DEBUG, "HTTP: Send failed: %s", 144 strerror(errno)); 145 } else if ((size_t) res < wpabuf_len(resp)) { 146 wpa_printf(MSG_DEBUG, "HTTP: Sent only %d of %lu bytes", 147 res, (unsigned long) wpabuf_len(resp)); 148 /* TODO: add eloop handler for sending rest of the data */ 149 } 150 151 wpabuf_free(resp); 152 } 153 154 155 void http_request_send_and_deinit(struct http_request *req, 156 struct wpabuf *resp) 157 { 158 http_request_send(req, resp); 159 http_request_deinit(req); 160 } 161 162 163 enum httpread_hdr_type http_request_get_type(struct http_request *req) 164 { 165 return httpread_hdr_type_get(req->hread); 166 } 167 168 169 char * http_request_get_uri(struct http_request *req) 170 { 171 return httpread_uri_get(req->hread); 172 } 173 174 175 char * http_request_get_hdr(struct http_request *req) 176 { 177 return httpread_hdr_get(req->hread); 178 } 179 180 181 char * http_request_get_data(struct http_request *req) 182 { 183 return httpread_data_get(req->hread); 184 } 185 186 187 char * http_request_get_hdr_line(struct http_request *req, const char *tag) 188 { 189 return httpread_hdr_line_get(req->hread, tag); 190 } 191 192 193 struct sockaddr_in * http_request_get_cli_addr(struct http_request *req) 194 { 195 return &req->cli; 196 } 197 198 199 static void http_server_cb(int sd, void *eloop_ctx, void *sock_ctx) 200 { 201 struct sockaddr_in addr; 202 socklen_t addr_len = sizeof(addr); 203 struct http_server *srv = eloop_ctx; 204 int conn; 205 struct http_request *req; 206 207 conn = accept(srv->fd, (struct sockaddr *) &addr, &addr_len); 208 if (conn < 0) { 209 wpa_printf(MSG_DEBUG, "HTTP: Failed to accept new connection: " 210 "%s", strerror(errno)); 211 return; 212 } 213 wpa_printf(MSG_DEBUG, "HTTP: Connection from %s:%d", 214 inet_ntoa(addr.sin_addr), ntohs(addr.sin_port)); 215 216 req = http_request_init(srv, conn, &addr); 217 if (req == NULL) { 218 close(conn); 219 return; 220 } 221 222 req->next = srv->requests; 223 srv->requests = req; 224 srv->request_count++; 225 } 226 227 228 struct http_server * http_server_init(struct in_addr *addr, int port, 229 void (*cb)(void *ctx, 230 struct http_request *req), 231 void *cb_ctx) 232 { 233 struct sockaddr_in sin; 234 struct http_server *srv; 235 int on = 1; 236 237 srv = os_zalloc(sizeof(*srv)); 238 if (srv == NULL) 239 return NULL; 240 srv->cb = cb; 241 srv->cb_ctx = cb_ctx; 242 243 srv->fd = socket(AF_INET, SOCK_STREAM, 0); 244 if (srv->fd < 0) 245 goto fail; 246 247 if (setsockopt(srv->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 248 { 249 wpa_printf(MSG_DEBUG, 250 "HTTP: setsockopt(SO_REUSEADDR) failed: %s", 251 strerror(errno)); 252 /* try to continue anyway */ 253 } 254 255 if (fcntl(srv->fd, F_SETFL, O_NONBLOCK) < 0) 256 goto fail; 257 if (port < 0) 258 srv->port = 49152; 259 else 260 srv->port = port; 261 262 os_memset(&sin, 0, sizeof(sin)); 263 sin.sin_family = AF_INET; 264 sin.sin_addr.s_addr = addr->s_addr; 265 266 for (;;) { 267 sin.sin_port = htons(srv->port); 268 if (bind(srv->fd, (struct sockaddr *) &sin, sizeof(sin)) == 0) 269 break; 270 if (errno == EADDRINUSE) { 271 /* search for unused port */ 272 if (++srv->port == 65535 || port >= 0) 273 goto fail; 274 continue; 275 } 276 wpa_printf(MSG_DEBUG, "HTTP: Failed to bind server port %d: " 277 "%s", srv->port, strerror(errno)); 278 goto fail; 279 } 280 if (listen(srv->fd, 10 /* max backlog */) < 0 || 281 fcntl(srv->fd, F_SETFL, O_NONBLOCK) < 0 || 282 eloop_register_sock(srv->fd, EVENT_TYPE_READ, http_server_cb, 283 srv, NULL)) 284 goto fail; 285 286 wpa_printf(MSG_DEBUG, "HTTP: Started server on %s:%d", 287 inet_ntoa(*addr), srv->port); 288 289 return srv; 290 291 fail: 292 http_server_deinit(srv); 293 return NULL; 294 } 295 296 297 void http_server_deinit(struct http_server *srv) 298 { 299 if (srv == NULL) 300 return; 301 if (srv->fd >= 0) { 302 eloop_unregister_sock(srv->fd, EVENT_TYPE_READ); 303 close(srv->fd); 304 } 305 http_request_free_all(srv->requests); 306 307 os_free(srv); 308 } 309 310 311 int http_server_get_port(struct http_server *srv) 312 { 313 return srv->port; 314 } 315
