70322ae3 |
1 | /* |
2 | * httpd.c: implementation of httpd.h. |
3 | */ |
4 | |
bf53e756 |
5 | #include "agedu.h" |
995db599 |
6 | #include "alloc.h" |
70322ae3 |
7 | #include "html.h" |
812e4bf2 |
8 | #include "httpd.h" |
70322ae3 |
9 | |
10 | /* --- Logic driving what the web server's responses are. --- */ |
11 | |
812e4bf2 |
12 | enum { /* connctx states */ |
13 | READING_REQ_LINE, |
14 | READING_HEADERS, |
15 | DONE |
16 | }; |
17 | |
70322ae3 |
18 | struct connctx { |
19 | const void *t; |
20 | char *data; |
21 | int datalen, datasize; |
812e4bf2 |
22 | char *method, *url, *headers, *auth; |
23 | int state; |
70322ae3 |
24 | }; |
25 | |
26 | /* |
27 | * Called when a new connection arrives on a listening socket. |
28 | * Returns a connctx for the new connection. |
29 | */ |
30 | struct connctx *new_connection(const void *t) |
31 | { |
32 | struct connctx *cctx = snew(struct connctx); |
33 | cctx->t = t; |
34 | cctx->data = NULL; |
35 | cctx->datalen = cctx->datasize = 0; |
812e4bf2 |
36 | cctx->state = READING_REQ_LINE; |
37 | cctx->method = cctx->url = cctx->headers = cctx->auth = NULL; |
70322ae3 |
38 | return cctx; |
39 | } |
40 | |
41 | void free_connection(struct connctx *cctx) |
42 | { |
43 | sfree(cctx->data); |
44 | sfree(cctx); |
45 | } |
46 | |
812e4bf2 |
47 | static char *http_error(char *code, char *errmsg, char *extraheader, |
48 | char *errtext, ...) |
70322ae3 |
49 | { |
50 | return dupfmt("HTTP/1.1 %s %s\r\n" |
51 | "Date: %D\r\n" |
bf53e756 |
52 | "Server: " PNAME "\r\n" |
70322ae3 |
53 | "Connection: close\r\n" |
812e4bf2 |
54 | "%s" |
70322ae3 |
55 | "Content-Type: text/html; charset=US-ASCII\r\n" |
56 | "\r\n" |
57 | "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\r\n" |
58 | "<HTML><HEAD>\r\n" |
59 | "<TITLE>%s %s</TITLE>\r\n" |
60 | "</HEAD><BODY>\r\n" |
61 | "<H1>%s %s</H1>\r\n" |
62 | "<P>%s</P>\r\n" |
63 | "</BODY></HTML>\r\n", code, errmsg, |
812e4bf2 |
64 | extraheader ? extraheader : "", |
70322ae3 |
65 | code, errmsg, code, errmsg, errtext); |
66 | } |
67 | |
68 | static char *http_success(char *mimetype, int stuff_cr, char *document) |
69 | { |
70 | return dupfmt("HTTP/1.1 200 OK\r\n" |
71 | "Date: %D\r\n" |
72 | "Expires: %D\r\n" |
bf53e756 |
73 | "Server: " PNAME "\r\n" |
70322ae3 |
74 | "Connection: close\r\n" |
75 | "Content-Type: %s\r\n" |
76 | "\r\n" |
77 | "%S", mimetype, stuff_cr, document); |
78 | } |
79 | |
80 | /* |
81 | * Called when data comes in on a connection. |
82 | * |
83 | * If this function returns NULL, the platform code continues |
84 | * reading from the socket. Otherwise, it returns some dynamically |
85 | * allocated data which the platform code will then write to the |
86 | * socket before closing it. |
87 | */ |
812e4bf2 |
88 | char *got_data(struct connctx *ctx, char *data, int length, |
f2e52893 |
89 | int magic_access, const char *auth_string, |
90 | const struct html_config *cfg) |
70322ae3 |
91 | { |
812e4bf2 |
92 | char *line, *p, *q, *r, *z1, *z2, c1, c2; |
93 | int auth_provided = 0, auth_correct = 0; |
70322ae3 |
94 | unsigned long index; |
95 | char *document, *ret; |
96 | |
812e4bf2 |
97 | /* |
98 | * Add the data we've just received to our buffer. |
99 | */ |
70322ae3 |
100 | if (ctx->datasize < ctx->datalen + length) { |
101 | ctx->datasize = (ctx->datalen + length) * 3 / 2 + 4096; |
102 | ctx->data = sresize(ctx->data, ctx->datasize, char); |
103 | } |
104 | memcpy(ctx->data + ctx->datalen, data, length); |
105 | ctx->datalen += length; |
106 | |
107 | /* |
812e4bf2 |
108 | * Gradually process the HTTP request as we receive it. |
70322ae3 |
109 | */ |
812e4bf2 |
110 | if (ctx->state == READING_REQ_LINE) { |
111 | /* |
112 | * We're waiting for the first line of the input, which |
113 | * contains the main HTTP request. See if we've got it |
114 | * yet. |
115 | */ |
70322ae3 |
116 | |
812e4bf2 |
117 | line = ctx->data; |
118 | /* |
119 | * RFC 2616 section 4.1: `In the interest of robustness, |
120 | * [...] if the server is reading the protocol stream at |
121 | * the beginning of a message and receives a CRLF first, |
122 | * it should ignore the CRLF.' |
123 | */ |
124 | while (line - ctx->data < ctx->datalen && |
125 | (*line == '\r' || *line == '\n')) |
126 | line++; |
127 | q = line; |
128 | while (q - ctx->data < ctx->datalen && *q != '\n') |
129 | q++; |
130 | if (q - ctx->data >= ctx->datalen) |
131 | return NULL; /* not got request line yet */ |
70322ae3 |
132 | |
812e4bf2 |
133 | /* |
134 | * We've got the first line of the request. Zero-terminate |
135 | * and parse it into method, URL and optional HTTP |
136 | * version. |
137 | */ |
138 | *q = '\0'; |
139 | ctx->headers = q+1; |
140 | if (q > line && q[-1] == '\r') |
141 | *--q = '\0'; |
142 | z1 = z2 = q; |
143 | c1 = c2 = *q; |
144 | p = line; |
145 | while (*p && !isspace((unsigned char)*p)) p++; |
146 | if (*p) { |
147 | z1 = p++; |
148 | c1 = *z1; |
149 | *z1 = '\0'; |
150 | } |
151 | while (*p && isspace((unsigned char)*p)) p++; |
152 | q = p; |
153 | while (*q && !isspace((unsigned char)*q)) q++; |
154 | z2 = q++; |
155 | c2 = *z2; |
156 | *z2 = '\0'; |
157 | while (*q && isspace((unsigned char)*q)) q++; |
158 | |
159 | /* |
160 | * Now `line' points at the method name; p points at the |
161 | * URL, if any; q points at the HTTP version, if any. |
162 | */ |
163 | |
164 | /* |
165 | * There should _be_ a URL, on any request type at all. |
166 | */ |
167 | if (!*p) { |
168 | char *ret, *text; |
169 | /* Restore the request to the way we received it. */ |
170 | *z2 = c2; |
171 | *z1 = c1; |
bf53e756 |
172 | text = dupfmt("<code>" PNAME "</code> received the HTTP request" |
812e4bf2 |
173 | " \"<code>%h</code>\", which contains no URL.", |
174 | line); |
175 | ret = http_error("400", "Bad request", NULL, text); |
176 | sfree(text); |
177 | return ret; |
178 | } |
179 | |
180 | ctx->method = line; |
181 | ctx->url = p; |
182 | |
183 | /* |
184 | * If there was an HTTP version, we might need to see |
185 | * headers. Otherwise, the request is done. |
186 | */ |
187 | if (*q) { |
188 | ctx->state = READING_HEADERS; |
189 | } else { |
190 | ctx->state = DONE; |
191 | } |
70322ae3 |
192 | } |
70322ae3 |
193 | |
812e4bf2 |
194 | if (ctx->state == READING_HEADERS) { |
195 | /* |
196 | * While we're receiving the HTTP request headers, all we |
197 | * do is to keep scanning to see if we find two newlines |
198 | * next to each other. |
199 | */ |
200 | q = ctx->data + ctx->datalen; |
201 | for (p = ctx->headers; p < q; p++) { |
202 | if (*p == '\n' && |
203 | ((p+1 < q && p[1] == '\n') || |
204 | (p+2 < q && p[1] == '\r' && p[2] == '\n'))) { |
205 | p[1] = '\0'; |
206 | ctx->state = DONE; |
207 | break; |
208 | } |
209 | } |
70322ae3 |
210 | } |
211 | |
812e4bf2 |
212 | if (ctx->state == DONE) { |
213 | /* |
214 | * Now we have the entire HTTP request. Decide what to do |
215 | * with it. |
216 | */ |
217 | if (auth_string) { |
218 | /* |
219 | * Search the request headers for Authorization. |
220 | */ |
221 | q = ctx->data + ctx->datalen; |
222 | for (p = ctx->headers; p < q; p++) { |
223 | const char *hdr = "Authorization:"; |
224 | int i; |
225 | for (i = 0; hdr[i]; i++) { |
226 | if (p >= q || tolower((unsigned char)*p) != |
227 | tolower((unsigned char)hdr[i])) |
228 | break; |
229 | p++; |
230 | } |
231 | if (!hdr[i]) |
232 | break; /* found our header */ |
233 | p = memchr(p, '\n', q - p); |
234 | if (!p) |
235 | p = q; |
236 | } |
237 | if (p < q) { |
238 | auth_provided = 1; |
239 | while (p < q && isspace((unsigned char)*p)) |
240 | p++; |
241 | r = p; |
242 | while (p < q && !isspace((unsigned char)*p)) |
243 | p++; |
244 | if (p < q) { |
245 | *p++ = '\0'; |
246 | if (!strcasecmp(r, "Basic")) { |
247 | while (p < q && isspace((unsigned char)*p)) |
248 | p++; |
249 | r = p; |
250 | while (p < q && !isspace((unsigned char)*p)) |
251 | p++; |
252 | if (p < q) { |
253 | *p++ = '\0'; |
254 | if (!strcmp(r, auth_string)) |
255 | auth_correct = 1; |
256 | } |
257 | } |
258 | } |
259 | } |
260 | } |
261 | |
262 | if (!magic_access && !auth_correct) { |
5a830bf8 |
263 | if (auth_string) { |
812e4bf2 |
264 | ret = http_error("401", "Unauthorized", |
bf53e756 |
265 | "WWW-Authenticate: Basic realm=\""PNAME"\"\r", |
5a830bf8 |
266 | "\nYou must authenticate to view these pages."); |
812e4bf2 |
267 | } else { |
268 | ret = http_error("403", "Forbidden", NULL, |
269 | "This is a restricted-access set of pages."); |
270 | } |
70322ae3 |
271 | } else { |
812e4bf2 |
272 | p = ctx->url; |
273 | p += strspn(p, "/?"); |
274 | index = strtoul(p, NULL, 10); |
f2e52893 |
275 | document = html_query(ctx->t, index, cfg); |
812e4bf2 |
276 | if (document) { |
277 | ret = http_success("text/html", 1, document); |
278 | sfree(document); |
279 | } else { |
280 | ret = http_error("404", "Not Found", NULL, |
281 | "Pathname index out of range."); |
282 | } |
70322ae3 |
283 | } |
812e4bf2 |
284 | return ret; |
285 | } else |
286 | return NULL; |
70322ae3 |
287 | } |
288 | |
289 | /* --- Platform support for running a web server. --- */ |
290 | |
291 | enum { FD_CLIENT, FD_LISTENER, FD_CONNECTION }; |
292 | |
293 | struct fd { |
294 | int fd; |
295 | int type; |
296 | int deleted; |
297 | char *wdata; |
298 | int wdatalen, wdatapos; |
299 | int magic_access; |
300 | struct connctx *cctx; |
301 | }; |
302 | |
303 | struct fd *fds = NULL; |
304 | int nfds = 0, fdsize = 0; |
305 | |
306 | struct fd *new_fdstruct(int fd, int type) |
307 | { |
308 | struct fd *ret; |
309 | |
310 | if (nfds >= fdsize) { |
311 | fdsize = nfds * 3 / 2 + 32; |
312 | fds = sresize(fds, fdsize, struct fd); |
313 | } |
314 | |
315 | ret = &fds[nfds++]; |
316 | |
317 | ret->fd = fd; |
318 | ret->type = type; |
319 | ret->wdata = NULL; |
320 | ret->wdatalen = ret->wdatapos = 0; |
321 | ret->cctx = NULL; |
322 | ret->deleted = 0; |
323 | ret->magic_access = 0; |
324 | |
325 | return ret; |
326 | } |
327 | |
812e4bf2 |
328 | int check_owning_uid(int fd, int flip) |
70322ae3 |
329 | { |
330 | struct sockaddr_in sock, peer; |
331 | socklen_t addrlen; |
332 | char linebuf[4096], matchbuf[80]; |
333 | FILE *fp; |
334 | |
335 | addrlen = sizeof(sock); |
812e4bf2 |
336 | if (getsockname(fd, (struct sockaddr *)&sock, &addrlen)) { |
70322ae3 |
337 | fprintf(stderr, "getsockname: %s\n", strerror(errno)); |
338 | exit(1); |
339 | } |
340 | addrlen = sizeof(peer); |
812e4bf2 |
341 | if (getpeername(fd, (struct sockaddr *)&peer, &addrlen)) { |
342 | if (errno == ENOTCONN) { |
343 | peer.sin_addr.s_addr = htonl(0); |
344 | peer.sin_port = htons(0); |
345 | } else { |
346 | fprintf(stderr, "getpeername: %s\n", strerror(errno)); |
347 | exit(1); |
348 | } |
349 | } |
350 | |
351 | if (flip) { |
352 | struct sockaddr_in tmp = sock; |
353 | sock = peer; |
354 | peer = tmp; |
70322ae3 |
355 | } |
356 | |
357 | sprintf(matchbuf, "%08X:%04X %08X:%04X", |
358 | peer.sin_addr.s_addr, ntohs(peer.sin_port), |
359 | sock.sin_addr.s_addr, ntohs(sock.sin_port)); |
360 | fp = fopen("/proc/net/tcp", "r"); |
361 | if (fp) { |
362 | while (fgets(linebuf, sizeof(linebuf), fp)) { |
363 | if (strlen(linebuf) >= 75 && |
364 | !strncmp(linebuf+6, matchbuf, strlen(matchbuf))) { |
812e4bf2 |
365 | return atoi(linebuf + 75); |
70322ae3 |
366 | } |
367 | } |
368 | } |
812e4bf2 |
369 | |
370 | return -1; |
371 | } |
372 | |
373 | void check_magic_access(struct fd *fd) |
374 | { |
375 | if (check_owning_uid(fd->fd, 0) == getuid()) |
376 | fd->magic_access = 1; |
70322ae3 |
377 | } |
378 | |
812e4bf2 |
379 | static void base64_encode_atom(unsigned char *data, int n, char *out) |
380 | { |
381 | static const char base64_chars[] = |
382 | "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; |
383 | |
384 | unsigned word; |
385 | |
386 | word = data[0] << 16; |
387 | if (n > 1) |
388 | word |= data[1] << 8; |
389 | if (n > 2) |
390 | word |= data[2]; |
391 | out[0] = base64_chars[(word >> 18) & 0x3F]; |
392 | out[1] = base64_chars[(word >> 12) & 0x3F]; |
393 | if (n > 1) |
394 | out[2] = base64_chars[(word >> 6) & 0x3F]; |
395 | else |
396 | out[2] = '='; |
397 | if (n > 2) |
398 | out[3] = base64_chars[word & 0x3F]; |
399 | else |
400 | out[3] = '='; |
401 | } |
402 | |
1e8d78b9 |
403 | void run_httpd(const void *t, int authmask, const struct httpd_config *dcfg, |
404 | const struct html_config *incfg) |
70322ae3 |
405 | { |
15e73840 |
406 | int fd, ret; |
812e4bf2 |
407 | int authtype; |
1e8d78b9 |
408 | char *authstring = NULL; |
70322ae3 |
409 | unsigned long ipaddr; |
410 | struct fd *f; |
411 | struct sockaddr_in addr; |
412 | socklen_t addrlen; |
f2e52893 |
413 | struct html_config cfg = *incfg; |
414 | |
cfe942fb |
415 | cfg.format = "%.0lu"; |
70322ae3 |
416 | |
417 | /* |
418 | * Establish the listening socket and retrieve its port |
419 | * number. |
420 | */ |
421 | fd = socket(PF_INET, SOCK_STREAM, 0); |
422 | if (fd < 0) { |
423 | fprintf(stderr, "socket(PF_INET): %s\n", strerror(errno)); |
424 | exit(1); |
425 | } |
426 | addr.sin_family = AF_INET; |
1e8d78b9 |
427 | if (!dcfg->address) { |
428 | srand(0L); |
429 | ipaddr = 0x7f000000; |
430 | ipaddr += (1 + rand() % 255) << 16; |
431 | ipaddr += (1 + rand() % 255) << 8; |
432 | ipaddr += (1 + rand() % 255); |
433 | addr.sin_addr.s_addr = htonl(ipaddr); |
434 | addr.sin_port = htons(0); |
15e73840 |
435 | |
1e8d78b9 |
436 | } else { |
437 | addr.sin_addr.s_addr = inet_addr(dcfg->address); |
15e73840 |
438 | addr.sin_port = dcfg->port ? htons(dcfg->port) : 0; |
1e8d78b9 |
439 | } |
70322ae3 |
440 | addrlen = sizeof(addr); |
15e73840 |
441 | ret = bind(fd, (const struct sockaddr *)&addr, addrlen); |
442 | if (ret < 0 && errno == EADDRNOTAVAIL && !dcfg->address) { |
443 | /* |
444 | * Some systems don't like us binding to random weird |
445 | * localhost-space addresses. Try again with the official |
446 | * INADDR_LOOPBACK. |
447 | */ |
448 | addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK); |
449 | addr.sin_port = htons(0); |
450 | ret = bind(fd, (const struct sockaddr *)&addr, addrlen); |
451 | } |
452 | if (ret < 0) { |
70322ae3 |
453 | fprintf(stderr, "bind: %s\n", strerror(errno)); |
454 | exit(1); |
455 | } |
456 | if (listen(fd, 5) < 0) { |
457 | fprintf(stderr, "listen: %s\n", strerror(errno)); |
458 | exit(1); |
459 | } |
460 | addrlen = sizeof(addr); |
461 | if (getsockname(fd, (struct sockaddr *)&addr, &addrlen)) { |
462 | fprintf(stderr, "getsockname: %s\n", strerror(errno)); |
463 | exit(1); |
464 | } |
812e4bf2 |
465 | if ((authmask & HTTPD_AUTH_MAGIC) && |
466 | (check_owning_uid(fd, 1) == getuid())) { |
467 | authtype = HTTPD_AUTH_MAGIC; |
1e8d78b9 |
468 | if (authmask != HTTPD_AUTH_MAGIC) |
469 | printf("Using Linux /proc/net magic authentication\n"); |
812e4bf2 |
470 | } else if ((authmask & HTTPD_AUTH_BASIC)) { |
1e8d78b9 |
471 | char username[128], password[128], userpassbuf[259]; |
472 | const char *userpass; |
812e4bf2 |
473 | const char *rname; |
474 | unsigned char passbuf[10]; |
475 | int i, j, k, fd; |
476 | |
477 | authtype = HTTPD_AUTH_BASIC; |
478 | |
1e8d78b9 |
479 | if (authmask != HTTPD_AUTH_BASIC) |
480 | printf("Using HTTP Basic authentication\n"); |
481 | |
482 | if (dcfg->basicauthdata) { |
483 | userpass = dcfg->basicauthdata; |
484 | } else { |
bf53e756 |
485 | strcpy(username, PNAME); |
1e8d78b9 |
486 | rname = "/dev/urandom"; |
812e4bf2 |
487 | fd = open(rname, O_RDONLY); |
488 | if (fd < 0) { |
1e8d78b9 |
489 | int err = errno; |
490 | rname = "/dev/random"; |
491 | fd = open(rname, O_RDONLY); |
492 | if (fd < 0) { |
493 | int err2 = errno; |
494 | fprintf(stderr, "/dev/urandom: open: %s\n", strerror(err)); |
495 | fprintf(stderr, "/dev/random: open: %s\n", strerror(err2)); |
496 | exit(1); |
497 | } |
812e4bf2 |
498 | } |
1e8d78b9 |
499 | for (i = 0; i < 10 ;) { |
500 | j = read(fd, passbuf + i, 10 - i); |
501 | if (j <= 0) { |
502 | fprintf(stderr, "%s: read: %s\n", rname, |
503 | j < 0 ? strerror(errno) : "unexpected EOF"); |
504 | exit(1); |
505 | } |
506 | i += j; |
812e4bf2 |
507 | } |
1e8d78b9 |
508 | close(fd); |
509 | for (i = 0; i < 16; i++) { |
510 | /* |
511 | * 32 characters out of the 36 alphanumerics gives |
512 | * me the latitude to discard i,l,o for being too |
513 | * numeric-looking, and w because it has two too |
514 | * many syllables and one too many presidential |
515 | * associations. |
516 | */ |
517 | static const char chars[32] = |
518 | "0123456789abcdefghjkmnpqrstuvxyz"; |
519 | int v = 0; |
520 | |
521 | k = i / 8 * 5; |
522 | for (j = 0; j < 5; j++) |
523 | v |= ((passbuf[k+j] >> (i%8)) & 1) << j; |
524 | |
525 | password[i] = chars[v]; |
526 | } |
527 | password[i] = '\0'; |
528 | |
529 | sprintf(userpassbuf, "%s:%s", username, password); |
530 | userpass = userpassbuf; |
812e4bf2 |
531 | |
1e8d78b9 |
532 | printf("Username: %s\nPassword: %s\n", username, password); |
533 | } |
812e4bf2 |
534 | |
1e8d78b9 |
535 | k = strlen(userpass); |
536 | authstring = snewn(k * 4 / 3 + 16, char); |
812e4bf2 |
537 | for (i = j = 0; i < k ;) { |
538 | int s = k-i < 3 ? k-i : 3; |
1e8d78b9 |
539 | base64_encode_atom((unsigned char *)(userpass+i), s, authstring+j); |
812e4bf2 |
540 | i += s; |
541 | j += 4; |
542 | } |
1e8d78b9 |
543 | authstring[j] = '\0'; |
544 | } else if ((authmask & HTTPD_AUTH_NONE)) { |
812e4bf2 |
545 | authtype = HTTPD_AUTH_NONE; |
1e8d78b9 |
546 | if (authmask != HTTPD_AUTH_NONE) |
547 | printf("Web server is unauthenticated\n"); |
548 | } else { |
bf53e756 |
549 | fprintf(stderr, PNAME ": authentication method not supported\n"); |
1e8d78b9 |
550 | exit(1); |
551 | } |
15e73840 |
552 | if (ntohs(addr.sin_addr.s_addr) == INADDR_ANY) { |
553 | printf("Server port: %d\n", ntohs(addr.sin_port)); |
554 | } else if (ntohs(addr.sin_port) == 80) { |
555 | printf("URL: http://%s/\n", inet_ntoa(addr.sin_addr)); |
556 | } else { |
557 | printf("URL: http://%s:%d/\n", |
558 | inet_ntoa(addr.sin_addr), ntohs(addr.sin_port)); |
812e4bf2 |
559 | } |
70322ae3 |
560 | |
561 | /* |
562 | * Now construct an fd structure to hold it. |
563 | */ |
564 | f = new_fdstruct(fd, FD_LISTENER); |
565 | |
566 | /* |
567 | * Read from standard input, and treat EOF as a notification |
568 | * to exit. |
569 | */ |
570 | new_fdstruct(0, FD_CLIENT); |
571 | |
572 | /* |
573 | * Now we're ready to run our main loop. Keep looping round on |
574 | * select. |
575 | */ |
576 | while (1) { |
577 | fd_set rfds, wfds; |
50e82fdc |
578 | int i, j; |
579 | SELECT_TYPE_ARG1 maxfd; |
580 | int ret; |
70322ae3 |
581 | |
582 | #define FD_SET_MAX(fd, set, max) \ |
583 | do { FD_SET((fd),(set)); (max) = ((max)<=(fd)?(fd)+1:(max)); } while(0) |
584 | |
585 | /* |
586 | * Loop round the fd list putting fds into our select |
587 | * sets. Also in this loop we remove any that were marked |
588 | * as deleted in the previous loop. |
589 | */ |
590 | FD_ZERO(&rfds); |
591 | FD_ZERO(&wfds); |
592 | maxfd = 0; |
593 | for (i = j = 0; j < nfds; j++) { |
594 | |
595 | if (fds[j].deleted) { |
596 | sfree(fds[j].wdata); |
597 | free_connection(fds[j].cctx); |
598 | continue; |
599 | } |
600 | fds[i] = fds[j]; |
601 | |
602 | switch (fds[i].type) { |
603 | case FD_CLIENT: |
15e73840 |
604 | FD_SET_MAX(fds[i].fd, &rfds, maxfd); |
605 | break; |
70322ae3 |
606 | case FD_LISTENER: |
607 | FD_SET_MAX(fds[i].fd, &rfds, maxfd); |
608 | break; |
609 | case FD_CONNECTION: |
610 | /* |
611 | * Always read from a connection socket. Even |
612 | * after we've started writing, the peer might |
613 | * still be sending (e.g. because we shamefully |
614 | * jumped the gun before waiting for the end of |
615 | * the HTTP request) and so we should be prepared |
616 | * to read data and throw it away. |
617 | */ |
618 | FD_SET_MAX(fds[i].fd, &rfds, maxfd); |
619 | /* |
620 | * Also attempt to write, if we have data to write. |
621 | */ |
622 | if (fds[i].wdatapos < fds[i].wdatalen) |
623 | FD_SET_MAX(fds[i].fd, &wfds, maxfd); |
624 | break; |
625 | } |
626 | |
627 | i++; |
628 | } |
629 | nfds = i; |
630 | |
50e82fdc |
631 | ret = select(maxfd, SELECT_TYPE_ARG234 &rfds, |
632 | SELECT_TYPE_ARG234 &wfds, SELECT_TYPE_ARG234 NULL, |
633 | SELECT_TYPE_ARG5 NULL); |
70322ae3 |
634 | if (ret <= 0) { |
635 | if (ret < 0 && (errno != EINTR)) { |
636 | fprintf(stderr, "select: %s", strerror(errno)); |
637 | exit(1); |
638 | } |
639 | continue; |
640 | } |
641 | |
642 | for (i = 0; i < nfds; i++) { |
643 | switch (fds[i].type) { |
644 | case FD_CLIENT: |
645 | if (FD_ISSET(fds[i].fd, &rfds)) { |
646 | char buf[4096]; |
647 | int ret = read(fds[i].fd, buf, sizeof(buf)); |
648 | if (ret <= 0) { |
649 | if (ret < 0) { |
650 | fprintf(stderr, "standard input: read: %s\n", |
651 | strerror(errno)); |
652 | exit(1); |
653 | } |
654 | return; |
655 | } |
656 | } |
657 | break; |
658 | case FD_LISTENER: |
659 | if (FD_ISSET(fds[i].fd, &rfds)) { |
660 | /* |
661 | * New connection has come in. Accept it. |
662 | */ |
663 | struct fd *f; |
664 | struct sockaddr_in addr; |
665 | socklen_t addrlen = sizeof(addr); |
666 | int newfd = accept(fds[i].fd, (struct sockaddr *)&addr, |
667 | &addrlen); |
668 | if (newfd < 0) |
669 | break; /* not sure what happened there */ |
670 | |
671 | f = new_fdstruct(newfd, FD_CONNECTION); |
672 | f->cctx = new_connection(t); |
812e4bf2 |
673 | if (authtype == HTTPD_AUTH_MAGIC) |
674 | check_magic_access(f); |
70322ae3 |
675 | } |
676 | break; |
677 | case FD_CONNECTION: |
678 | if (FD_ISSET(fds[i].fd, &rfds)) { |
679 | /* |
680 | * There's data to be read. |
681 | */ |
682 | char readbuf[4096]; |
683 | int ret; |
684 | |
685 | ret = read(fds[i].fd, readbuf, sizeof(readbuf)); |
686 | if (ret <= 0) { |
687 | /* |
688 | * This shouldn't happen in a sensible |
689 | * HTTP connection, so we abandon the |
690 | * connection if it does. |
691 | */ |
692 | close(fds[i].fd); |
693 | fds[i].deleted = 1; |
694 | break; |
695 | } else { |
696 | if (!fds[i].wdata) { |
697 | /* |
698 | * If we haven't got an HTTP response |
699 | * yet, keep processing data in the |
700 | * hope of acquiring one. |
701 | */ |
812e4bf2 |
702 | fds[i].wdata = got_data |
703 | (fds[i].cctx, readbuf, ret, |
704 | (authtype == HTTPD_AUTH_NONE || |
f2e52893 |
705 | fds[i].magic_access), authstring, &cfg); |
70322ae3 |
706 | if (fds[i].wdata) { |
707 | fds[i].wdatalen = strlen(fds[i].wdata); |
708 | fds[i].wdatapos = 0; |
709 | } |
710 | } else { |
711 | /* |
712 | * Otherwise, just drop our read data |
713 | * on the floor. |
714 | */ |
715 | } |
716 | } |
717 | } |
718 | if (FD_ISSET(fds[i].fd, &wfds) && |
719 | fds[i].wdatapos < fds[i].wdatalen) { |
720 | /* |
721 | * The socket is writable, and we have data to |
722 | * write. Write it. |
723 | */ |
724 | int ret = write(fds[i].fd, fds[i].wdata + fds[i].wdatapos, |
725 | fds[i].wdatalen - fds[i].wdatapos); |
726 | if (ret <= 0) { |
727 | /* |
728 | * Shouldn't happen; abandon the connection. |
729 | */ |
730 | close(fds[i].fd); |
731 | fds[i].deleted = 1; |
732 | break; |
733 | } else { |
734 | fds[i].wdatapos += ret; |
735 | if (fds[i].wdatapos == fds[i].wdatalen) { |
736 | shutdown(fds[i].fd, SHUT_WR); |
737 | } |
738 | } |
739 | } |
740 | break; |
741 | } |
742 | } |
743 | |
744 | } |
745 | } |