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annotate src/c/http.c @ 2198:cf2abef213d8

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author Adam Chlipala <adam@chlipala.net>
date Sat, 05 Dec 2015 12:12:40 -0500
parents 3b4a5604ed97
children
rev   line source
adamc@1268 1 #include "config.h"
adamc@1268 2
adamc@116 3 #include <stdio.h>
adamc@116 4 #include <string.h>
adamc@502 5 #include <stdlib.h>
adamc@116 6 #include <sys/types.h>
adamc@116 7 #include <sys/socket.h>
adamc@116 8 #include <netinet/in.h>
adam@1917 9 #include <netinet/tcp.h>
adam@1779 10 #include <arpa/inet.h>
adamc@472 11 #include <unistd.h>
adamc@502 12 #include <signal.h>
adamc@856 13 #include <stdarg.h>
adamc@116 14
adamc@138 15 #include <pthread.h>
adamc@138 16
adamc@244 17 #include "urweb.h"
adamc@853 18 #include "request.h"
adamc@859 19 #include "queue.h"
adamc@117 20
adamc@1094 21 extern uw_app uw_application;
adamc@1094 22
adam@1914 23 int uw_backlog = SOMAXCONN;
adam@1930 24 static int keepalive = 0, quiet = 0;
adamc@116 25
grrwlf@2069 26 #define qfprintf(f, fmt, args...) do { if(!quiet) fprintf(f, fmt, ##args); } while(0)
grrwlf@2069 27 #define qprintf(fmt, args...) do { if(!quiet) printf(fmt, ##args); } while(0)
grrwlf@2069 28
adamc@854 29 static char *get_header(void *data, const char *h) {
adamc@854 30 char *s = data;
adamc@854 31 int len = strlen(h);
adamc@854 32 char *p;
adamc@854 33
adamc@1134 34 while ((p = strchr(s, ':'))) {
adamc@854 35 if (p - s == len && !strncasecmp(s, h, len)) {
adamc@854 36 return p + 2;
adamc@854 37 } else {
adamc@854 38 if ((s = strchr(p, 0)) && s[1] != 0)
adamc@854 39 s += 2;
adamc@854 40 else
adamc@854 41 return NULL;
adamc@854 42 }
adamc@854 43 }
adamc@854 44
adamc@854 45 return NULL;
adamc@854 46 }
adamc@854 47
adam@1799 48 static char *get_env(void *data, const char *name) {
adam@1799 49 return getenv(name);
adam@1799 50 }
adam@1799 51
adamc@856 52 static void on_success(uw_context ctx) {
adamc@856 53 uw_write_header(ctx, "HTTP/1.1 200 OK\r\n");
adamc@856 54 }
adamc@856 55
adamc@856 56 static void on_failure(uw_context ctx) {
adamc@856 57 uw_write_header(ctx, "HTTP/1.1 500 Internal Server Error\r\n");
adamc@856 58 }
adamc@856 59
adamc@856 60 static void log_error(void *data, const char *fmt, ...) {
adamc@856 61 va_list ap;
adamc@856 62 va_start(ap, fmt);
adamc@856 63
adamc@856 64 vfprintf(stderr, fmt, ap);
adamc@856 65 }
adamc@856 66
adamc@856 67 static void log_debug(void *data, const char *fmt, ...) {
adam@1930 68 if (!quiet) {
adam@1930 69 va_list ap;
adam@1930 70 va_start(ap, fmt);
adamc@856 71
adam@1930 72 vprintf(fmt, ap);
adam@1930 73 }
adamc@856 74 }
adamc@856 75
grrwlf@1997 76 static uw_loggers ls = {NULL, log_error, log_debug};
grrwlf@1997 77
adamc@853 78 static void *worker(void *data) {
adamc@853 79 int me = *(int *)data;
grrwlf@1997 80 uw_context ctx = uw_request_new_context(me, &uw_application, &ls);
adam@1937 81 size_t buf_size = 1024;
adam@1917 82 char *buf = malloc(buf_size), *back = buf;
adamc@853 83 uw_request_context rc = uw_new_request_context();
adam@1917 84 int sock = 0;
adamc@698 85
adamc@272 86 while (1) {
adam@1917 87 if (sock == 0) {
adam@1917 88 back = buf;
adam@1917 89 sock = uw_dequeue();
adam@1917 90 }
adamc@138 91
adam@2073 92 uw_set_remoteSock(ctx, sock);
adam@2073 93
grrwlf@2069 94 qprintf("Handling connection with thread #%d.\n", me);
adamc@138 95
adamc@138 96 while (1) {
adamc@737 97 int r;
adam@1917 98 char *method, *path, *query_string, *headers, *body, *after, *s, *s2;
adamc@737 99
adamc@742 100 if (back - buf == buf_size - 1) {
adamc@737 101 char *new_buf;
grrwlf@2070 102 size_t new_buf_size = buf_size*2;
grrwlf@2070 103 new_buf = realloc(buf, new_buf_size);
grrwlf@2070 104 if(!new_buf) {
grrwlf@2070 105 qfprintf(stderr, "Realloc failed while receiving header\n");
grrwlf@2070 106 close(sock);
grrwlf@2070 107 sock = 0;
grrwlf@2070 108 break;
grrwlf@2070 109 }
grrwlf@2070 110 buf_size = new_buf_size;
adamc@737 111 back = new_buf + (back - buf);
adamc@737 112 buf = new_buf;
adamc@737 113 }
adamc@737 114
adam@1937 115 *back = 0;
adam@1937 116 body = strstr(buf, "\r\n\r\n");
adam@1937 117 if (body == NULL) {
adam@1937 118 r = recv(sock, back, buf_size - 1 - (back - buf), 0);
adamc@138 119
adam@1937 120 if (r < 0) {
grrwlf@2071 121 qfprintf(stderr, "Recv failed while receiving header, retcode %d errno %m\n", r);
adam@1937 122 close(sock);
adam@1937 123 sock = 0;
adam@1937 124 break;
adam@1937 125 }
adam@1937 126
adam@1937 127 if (r == 0) {
grrwlf@2069 128 qprintf("Connection closed.\n");
adam@1937 129 close(sock);
adam@1937 130 sock = 0;
adam@1937 131 break;
adam@1937 132 }
adam@1937 133
adam@1937 134 back += r;
adam@1937 135 *back = 0;
adamc@138 136 }
adamc@138 137
adam@1937 138 if (body != NULL || (body = strstr(buf, "\r\n\r\n"))) {
adamc@853 139 request_result rr;
adam@1917 140 int should_keepalive = 0;
adamc@138 141
adamc@854 142 body[0] = body[1] = 0;
adamc@854 143 body += 4;
adamc@854 144
adamc@854 145 if ((s = strcasestr(buf, "\r\nContent-Length: ")) && s < body) {
adamc@853 146 int clen;
adamc@737 147
adamc@854 148 if (sscanf(s + 18, "%d\r\n", &clen) != 1) {
adamc@853 149 fprintf(stderr, "Malformed Content-Length header\n");
adam@1917 150 close(sock);
adam@1917 151 sock = 0;
adamc@167 152 break;
adamc@167 153 }
adamc@167 154
adamc@854 155 while (back - body < clen) {
adamc@854 156 if (back - buf == buf_size - 1) {
adamc@854 157 char *new_buf;
grrwlf@2070 158 size_t new_buf_size = buf_size * 2;
grrwlf@2070 159 new_buf = realloc(buf, new_buf_size);
grrwlf@2070 160 if(!new_buf) {
grrwlf@2070 161 qfprintf(stderr, "Realloc failed while receiving content\n");
grrwlf@2070 162 close(sock);
grrwlf@2070 163 sock = 0;
grrwlf@2070 164 goto done;
grrwlf@2070 165 }
adamc@854 166
grrwlf@2070 167 buf_size = new_buf_size;
adamc@854 168 back = new_buf + (back - buf);
adamc@854 169 body = new_buf + (body - buf);
adamc@854 170 s = new_buf + (s - buf);
adamc@854 171
adamc@854 172 buf = new_buf;
adamc@854 173 }
adamc@854 174
adamc@854 175 r = recv(sock, back, buf_size - 1 - (back - buf), 0);
adamc@854 176
adamc@854 177 if (r < 0) {
grrwlf@2071 178 qfprintf(stderr, "Recv failed while receiving content, retcode %d errno %m\n", r);
adamc@854 179 close(sock);
adam@1917 180 sock = 0;
adamc@854 181 goto done;
adamc@854 182 }
adamc@854 183
adamc@854 184 if (r == 0) {
grrwlf@2069 185 qfprintf(stderr, "Connection closed.\n");
adamc@854 186 close(sock);
adam@1917 187 sock = 0;
adamc@854 188 goto done;
adamc@854 189 }
adamc@854 190
adamc@854 191 back += r;
adamc@854 192 *back = 0;
adamc@854 193 }
adam@1917 194
adam@1917 195 after = body + clen;
adam@1917 196 } else
adam@1917 197 after = body;
adamc@138 198
adamc@1119 199 body[-4] = '\r';
adamc@1119 200 body[-3] = '\n';
adamc@1119 201
adamc@854 202 if (!(s = strstr(buf, "\r\n"))) {
adamc@854 203 fprintf(stderr, "No newline in request\n");
adamc@854 204 close(sock);
adam@1917 205 sock = 0;
adamc@854 206 goto done;
adamc@854 207 }
adamc@854 208
adamc@1119 209 body[-4] = body[-3] = 0;
adamc@1119 210
adamc@854 211 *s = 0;
adamc@854 212 headers = s + 2;
adamc@854 213 method = s = buf;
adamc@854 214
adam@1426 215 strsep(&s, " ");
adam@1426 216 if (!s) {
adamc@854 217 fprintf(stderr, "No first space in HTTP command\n");
adamc@854 218 close(sock);
adam@1917 219 sock = 0;
adamc@854 220 goto done;
adamc@854 221 }
adamc@854 222 path = s;
adamc@854 223
adamc@1134 224 if ((s = strchr(path, ' ')))
adamc@854 225 *s = 0;
adamc@854 226
adamc@1134 227 if ((s = strchr(path, '?'))) {
adamc@854 228 *s = 0;
adamc@854 229 query_string = s+1;
adamc@854 230 }
adamc@854 231 else
adamc@854 232 query_string = NULL;
adamc@854 233
adamc@854 234 s = headers;
adamc@1134 235 while ((s2 = strchr(s, '\r'))) {
adam@1937 236 if (s2 == s) {
adam@1937 237 *s = 0;
adam@1937 238 break;
adam@1937 239 }
adam@1937 240
adamc@854 241 s = s2;
adamc@854 242
adamc@854 243 if (s[1] == 0)
adamc@854 244 break;
adamc@854 245
adamc@854 246 *s = 0;
adamc@854 247 s += 2;
adamc@854 248 }
adamc@854 249
adamc@854 250 uw_set_headers(ctx, get_header, headers);
adam@1799 251 uw_set_env(ctx, get_env, NULL);
adamc@854 252
grrwlf@2069 253 qprintf("Serving URI %s....\n", path);
adamc@856 254 rr = uw_request(rc, ctx, method, path, query_string, body, back - body,
adamc@856 255 on_success, on_failure,
adamc@856 256 NULL, log_error, log_debug,
adamc@863 257 sock, uw_really_send, close);
adam@1917 258
adam@1915 259 if (rr != KEEP_OPEN) {
adam@1917 260 if (keepalive) {
adam@1917 261 char *connection = uw_Basis_requestHeader(ctx, "Connection");
adam@1917 262
adam@1917 263 should_keepalive = !(connection && !strcmp(connection, "close"));
adam@1917 264 }
adam@1917 265
adam@1917 266 if (!should_keepalive)
adam@1917 267 uw_write_header(ctx, "Connection: close\r\n");
adam@1917 268
adam@1934 269 if (!uw_has_contentLength(ctx)) {
adam@1934 270 char clen[100];
adam@1934 271
adam@1934 272 sprintf(clen, "Content-length: %d\r\n", uw_pagelen(ctx));
adam@1934 273 uw_write_header(ctx, clen);
adam@1934 274 }
adam@1934 275
adam@1915 276 uw_send(ctx, sock);
adam@1915 277 }
adamc@138 278
adam@1917 279 if (rr == SERVED || rr == FAILED) {
adam@1917 280 if (should_keepalive) {
adam@1917 281 // In case any other requests are queued up, shift
adam@1917 282 // unprocessed part of buffer to front.
adam@1917 283 int kept = back - after;
adam@1944 284
adam@1945 285 if (kept == 0) {
adam@1944 286 // No pipelining going on here.
adam@1944 287 // We'd might as well try to switch to a different connection,
adam@1944 288 // while we wait for more input on this one.
adam@1944 289 uw_enqueue(sock);
adam@1944 290 sock = 0;
adam@1944 291 } else {
adam@1944 292 // More input! Move it to the front and continue in this loop.
adam@1944 293 memmove(buf, after, kept);
adam@1944 294 back = buf + kept;
adam@1944 295 }
adam@1917 296 } else {
adam@1917 297 close(sock);
adam@1917 298 sock = 0;
adam@1917 299 }
adam@1931 300 } else if (rr == KEEP_OPEN)
adam@1931 301 sock = 0;
adam@1931 302 else
adamc@853 303 fprintf(stderr, "Illegal uw_request return code: %d\n", rr);
adamc@853 304
adamc@138 305 break;
adamc@138 306 }
adamc@116 307 }
adamc@116 308
adamc@854 309 done:
adamc@311 310 uw_reset(ctx);
adamc@116 311 }
adamc@1138 312
adamc@1138 313 return NULL;
adamc@116 314 }
adamc@102 315
adamc@477 316 static void help(char *cmd) {
adam@2172 317 printf("Usage: %s [-p <port>] [-a <IP address>] [-t <thread count>] [-k] [-q] [-T SEC]\nThe '-k' option turns on HTTP keepalive.\nThe '-q' option turns off some chatter on stdout.\nThe '-T' option sets socket recv timeout (0 disables timeout, default is 5 sec).\n", cmd);
adamc@477 318 }
adamc@477 319
adamc@502 320 static void sigint(int signum) {
adamc@502 321 printf("Exiting....\n");
adamc@502 322 exit(0);
adamc@502 323 }
adamc@502 324
adamc@138 325 int main(int argc, char *argv[]) {
adamc@116 326 // The skeleton for this function comes from Beej's sockets tutorial.
adamc@138 327 int sockfd; // listen on sock_fd
adamc@116 328 struct sockaddr_in my_addr;
adamc@116 329 struct sockaddr_in their_addr; // connector's address information
adamc@1134 330 socklen_t sin_size;
adamc@1134 331 int yes = 1, uw_port = 8080, nthreads = 1, i, *names, opt;
grrwlf@2071 332 int recv_timeout_sec = 5;
adamc@502 333
adamc@502 334 signal(SIGINT, sigint);
adamc@505 335 signal(SIGPIPE, SIG_IGN);
adamc@505 336
adam@1779 337 my_addr.sin_addr.s_addr = INADDR_ANY; // auto-fill with my IP
adam@1779 338 memset(my_addr.sin_zero, '\0', sizeof my_addr.sin_zero);
adam@1779 339
grrwlf@2071 340 while ((opt = getopt(argc, argv, "hp:a:t:kqT:")) != -1) {
adamc@472 341 switch (opt) {
adamc@472 342 case '?':
adam@1930 343 fprintf(stderr, "Unknown command-line option\n");
adamc@477 344 help(argv[0]);
adamc@472 345 return 1;
adamc@138 346
adamc@477 347 case 'h':
adamc@477 348 help(argv[0]);
adamc@477 349 return 0;
adamc@477 350
adamc@472 351 case 'p':
adamc@472 352 uw_port = atoi(optarg);
adamc@472 353 if (uw_port <= 0) {
adamc@472 354 fprintf(stderr, "Invalid port number\n");
adamc@477 355 help(argv[0]);
adamc@472 356 return 1;
adamc@472 357 }
adamc@472 358 break;
adamc@472 359
adam@1779 360 case 'a':
adam@1779 361 if (!inet_pton(AF_INET, optarg, &my_addr.sin_addr)) {
adam@1779 362 fprintf(stderr, "Invalid IP address\n");
adam@1779 363 help(argv[0]);
adam@1779 364 return 1;
adam@1779 365 }
adam@1779 366 break;
adam@1779 367
adamc@472 368 case 't':
adamc@472 369 nthreads = atoi(optarg);
adamc@472 370 if (nthreads <= 0) {
adamc@472 371 fprintf(stderr, "Invalid thread count\n");
adamc@477 372 help(argv[0]);
adamc@472 373 return 1;
adamc@472 374 }
adamc@472 375 break;
adamc@472 376
adam@1917 377 case 'k':
adam@1917 378 keepalive = 1;
adam@1917 379 break;
adam@1917 380
grrwlf@2071 381 case 'T':
grrwlf@2071 382 recv_timeout_sec = atoi(optarg);
grrwlf@2071 383 if (recv_timeout_sec < 0) {
grrwlf@2071 384 fprintf(stderr, "Invalid recv timeout\n");
grrwlf@2071 385 help(argv[0]);
grrwlf@2071 386 return 1;
grrwlf@2071 387 }
grrwlf@2071 388 break;
grrwlf@2071 389
adam@1930 390 case 'q':
adam@1930 391 quiet = 1;
adam@1930 392 break;
adam@1930 393
adamc@472 394 default:
adamc@472 395 fprintf(stderr, "Unexpected getopt() behavior\n");
adamc@472 396 return 1;
adamc@472 397 }
adamc@138 398 }
adamc@138 399
grrwlf@1997 400 uw_request_init(&uw_application, &ls);
adamc@687 401
adamc@138 402 names = calloc(nthreads, sizeof(int));
adamc@116 403
adamc@116 404 sockfd = socket(PF_INET, SOCK_STREAM, 0); // do some error checking!
adamc@116 405
adamc@116 406 if (sockfd < 0) {
adamc@116 407 fprintf(stderr, "Listener socket creation failed\n");
adamc@116 408 return 1;
adamc@116 409 }
adamc@116 410
adamc@116 411 if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) < 0) {
adamc@116 412 fprintf(stderr, "Listener socket option setting failed\n");
adamc@116 413 return 1;
adamc@116 414 }
adamc@116 415
adamc@116 416 my_addr.sin_family = AF_INET; // host byte order
adamc@311 417 my_addr.sin_port = htons(uw_port); // short, network byte order
adamc@116 418
adamc@116 419 if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof my_addr) < 0) {
adamc@116 420 fprintf(stderr, "Listener socket bind failed\n");
adamc@116 421 return 1;
adamc@116 422 }
adamc@116 423
adamc@311 424 if (listen(sockfd, uw_backlog) < 0) {
adamc@116 425 fprintf(stderr, "Socket listen failed\n");
adamc@116 426 return 1;
adamc@116 427 }
adamc@116 428
adamc@116 429 sin_size = sizeof their_addr;
adamc@116 430
grrwlf@2069 431 qprintf("Listening on port %d....\n", uw_port);
adamc@116 432
adamc@667 433 {
adamc@667 434 pthread_t thread;
adamc@667 435
grrwlf@1997 436 pruner_data *pd = (pruner_data *)malloc(sizeof(pruner_data));
grrwlf@1997 437 pd->app = &uw_application;
grrwlf@1997 438 pd->loggers = &ls;
grrwlf@1997 439
grrwlf@1997 440 if (pthread_create_big(&thread, NULL, client_pruner, pd)) {
adamc@667 441 fprintf(stderr, "Error creating pruner thread\n");
adamc@667 442 return 1;
adamc@667 443 }
adamc@667 444 }
adamc@667 445
adamc@138 446 for (i = 0; i < nthreads; ++i) {
adamc@138 447 pthread_t thread;
adamc@138 448 names[i] = i;
adam@1522 449 if (pthread_create_big(&thread, NULL, worker, &names[i])) {
adamc@138 450 fprintf(stderr, "Error creating worker thread #%d\n", i);
adamc@138 451 return 1;
adamc@138 452 }
adamc@138 453 }
adamc@138 454
adamc@116 455 while (1) {
adamc@138 456 int new_fd = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size);
adamc@116 457
adamc@116 458 if (new_fd < 0) {
grrwlf@2069 459 qfprintf(stderr, "Socket accept failed\n");
adam@1948 460 } else {
grrwlf@2069 461 qprintf("Accepted connection.\n");
adam@1948 462
adam@1948 463 if (keepalive) {
adam@1948 464 int flag = 1;
adam@1948 465 setsockopt(new_fd, IPPROTO_TCP, TCP_NODELAY, (char *) &flag, sizeof(int));
adam@1948 466 }
adam@1948 467
grrwlf@2071 468 if(recv_timeout_sec>0) {
grrwlf@2071 469 int ret;
grrwlf@2071 470 struct timeval tv;
grrwlf@2071 471 memset(&tv, 0, sizeof(struct timeval));
grrwlf@2071 472 tv.tv_sec = recv_timeout_sec;
grrwlf@2071 473 ret = setsockopt(new_fd, SOL_SOCKET, SO_RCVTIMEO, (char *)&tv, sizeof(struct timeval));
grrwlf@2071 474 if(ret != 0) {
grrwlf@2071 475 qfprintf(stderr, "Timeout setting failed, errcode %d errno '%m'\n", ret);
grrwlf@2071 476 }
grrwlf@2071 477 }
grrwlf@2071 478
adam@1948 479 uw_enqueue(new_fd);
adamc@116 480 }
adamc@116 481 }
adamc@102 482 }
adamc@1121 483
adamc@1121 484 void *uw_init_client_data() {
adamc@1121 485 return NULL;
adamc@1121 486 }
adamc@1121 487
adamc@1121 488 void uw_free_client_data(void *data) {
adamc@1121 489 }
adamc@1121 490
adamc@1121 491 void uw_copy_client_data(void *dst, void *src) {
adamc@1121 492 }
adamc@1121 493
adamc@1121 494 void uw_do_expunge(uw_context ctx, uw_Basis_client cli, void *data) {
adam@1941 495 uw_ensure_transaction(ctx);
adam@1941 496 uw_get_app(ctx)->expunger(ctx, cli);
adam@1941 497
adam@1941 498 if (uw_commit(ctx))
adam@1941 499 uw_error(ctx, UNLIMITED_RETRY, "Rerunning expunge transaction");
adamc@1121 500 }
adamc@1121 501
adamc@1121 502 void uw_post_expunge(uw_context ctx, void *data) {
adamc@1121 503 }
adam@1320 504
adam@1320 505 int uw_supports_direct_status = 1;