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