| 1 | /* |
| 2 | ashd - A Sane HTTP Daemon |
| 3 | Copyright (C) 2008 Fredrik Tolf <fredrik@dolda2000.com> |
| 4 | |
| 5 | This program is free software: you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by |
| 7 | the Free Software Foundation, either version 3 of the License, or |
| 8 | (at your option) any later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 17 | */ |
| 18 | |
| 19 | #include <stdlib.h> |
| 20 | #include <unistd.h> |
| 21 | #include <stdio.h> |
| 22 | #include <string.h> |
| 23 | #include <sys/socket.h> |
| 24 | #include <pwd.h> |
| 25 | #include <errno.h> |
| 26 | |
| 27 | #ifdef HAVE_CONFIG_H |
| 28 | #include <config.h> |
| 29 | #endif |
| 30 | #include <utils.h> |
| 31 | #include <mt.h> |
| 32 | #include <mtio.h> |
| 33 | #include <log.h> |
| 34 | #include <req.h> |
| 35 | #include <proc.h> |
| 36 | |
| 37 | #include "htparser.h" |
| 38 | |
| 39 | static int plex; |
| 40 | |
| 41 | static struct hthead *parsereq(FILE *in) |
| 42 | { |
| 43 | struct hthead *req; |
| 44 | struct charbuf method, url, ver; |
| 45 | int c; |
| 46 | |
| 47 | req = NULL; |
| 48 | bufinit(method); |
| 49 | bufinit(url); |
| 50 | bufinit(ver); |
| 51 | while(1) { |
| 52 | c = getc(in); |
| 53 | if(c == ' ') { |
| 54 | break; |
| 55 | } else if((c == EOF) || (c < 32) || (c >= 128)) { |
| 56 | goto fail; |
| 57 | } else { |
| 58 | bufadd(method, c); |
| 59 | } |
| 60 | } |
| 61 | while(1) { |
| 62 | c = getc(in); |
| 63 | if(c == ' ') { |
| 64 | break; |
| 65 | } else if((c == EOF) || (c < 32)) { |
| 66 | goto fail; |
| 67 | } else { |
| 68 | bufadd(url, c); |
| 69 | } |
| 70 | } |
| 71 | while(1) { |
| 72 | c = getc(in); |
| 73 | if(c == 10) { |
| 74 | break; |
| 75 | } else if(c == 13) { |
| 76 | } else if((c == EOF) || (c < 32) || (c >= 128)) { |
| 77 | goto fail; |
| 78 | } else { |
| 79 | bufadd(ver, c); |
| 80 | } |
| 81 | } |
| 82 | bufadd(method, 0); |
| 83 | bufadd(url, 0); |
| 84 | bufadd(ver, 0); |
| 85 | req = mkreq(method.b, url.b, ver.b); |
| 86 | if(parseheaders(req, in)) |
| 87 | goto fail; |
| 88 | goto out; |
| 89 | |
| 90 | fail: |
| 91 | if(req != NULL) { |
| 92 | freehthead(req); |
| 93 | req = NULL; |
| 94 | } |
| 95 | out: |
| 96 | buffree(method); |
| 97 | buffree(url); |
| 98 | buffree(ver); |
| 99 | return(req); |
| 100 | } |
| 101 | |
| 102 | static struct hthead *parseresp(FILE *in) |
| 103 | { |
| 104 | struct hthead *req; |
| 105 | int code; |
| 106 | struct charbuf ver, msg; |
| 107 | int c; |
| 108 | |
| 109 | req = NULL; |
| 110 | bufinit(ver); |
| 111 | bufinit(msg); |
| 112 | code = 0; |
| 113 | while(1) { |
| 114 | c = getc(in); |
| 115 | if(c == ' ') { |
| 116 | break; |
| 117 | } else if((c == EOF) || (c < 32) || (c >= 128)) { |
| 118 | goto fail; |
| 119 | } else { |
| 120 | bufadd(ver, c); |
| 121 | } |
| 122 | } |
| 123 | while(1) { |
| 124 | c = getc(in); |
| 125 | if(c == ' ') { |
| 126 | break; |
| 127 | } else if((c == EOF) || (c < '0') || (c > '9')) { |
| 128 | goto fail; |
| 129 | } else { |
| 130 | code = (code * 10) + (c - '0'); |
| 131 | } |
| 132 | } |
| 133 | while(1) { |
| 134 | c = getc(in); |
| 135 | if(c == 10) { |
| 136 | break; |
| 137 | } else if(c == 13) { |
| 138 | } else if((c == EOF) || (c < 32)) { |
| 139 | goto fail; |
| 140 | } else { |
| 141 | bufadd(msg, c); |
| 142 | } |
| 143 | } |
| 144 | bufadd(msg, 0); |
| 145 | bufadd(ver, 0); |
| 146 | req = mkresp(code, msg.b, ver.b); |
| 147 | if(parseheaders(req, in)) |
| 148 | goto fail; |
| 149 | goto out; |
| 150 | |
| 151 | fail: |
| 152 | if(req != NULL) { |
| 153 | freehthead(req); |
| 154 | req = NULL; |
| 155 | } |
| 156 | out: |
| 157 | buffree(msg); |
| 158 | buffree(ver); |
| 159 | return(req); |
| 160 | } |
| 161 | |
| 162 | static off_t passdata(FILE *in, FILE *out, off_t max) |
| 163 | { |
| 164 | size_t read; |
| 165 | off_t total; |
| 166 | char buf[8192]; |
| 167 | |
| 168 | total = 0; |
| 169 | while(!feof(in) && ((max < 0) || (total < max))) { |
| 170 | read = sizeof(buf); |
| 171 | if(max >= 0) |
| 172 | read = min(max - total, read); |
| 173 | read = fread(buf, 1, read, in); |
| 174 | if(ferror(in)) |
| 175 | return(-1); |
| 176 | if(fwrite(buf, 1, read, out) != read) |
| 177 | return(-1); |
| 178 | total += read; |
| 179 | } |
| 180 | return(total); |
| 181 | } |
| 182 | |
| 183 | static int passchunks(FILE *in, FILE *out) |
| 184 | { |
| 185 | char buf[8192]; |
| 186 | size_t read; |
| 187 | |
| 188 | do { |
| 189 | read = fread(buf, 1, sizeof(buf), in); |
| 190 | if(ferror(in)) |
| 191 | return(-1); |
| 192 | fprintf(out, "%zx\r\n", read); |
| 193 | if(fwrite(buf, 1, read, out) != read) |
| 194 | return(-1); |
| 195 | fprintf(out, "\r\n"); |
| 196 | } while(read > 0); |
| 197 | return(0); |
| 198 | } |
| 199 | |
| 200 | static int hasheader(struct hthead *head, char *name, char *val) |
| 201 | { |
| 202 | char *hd; |
| 203 | |
| 204 | if((hd = getheader(head, name)) == NULL) |
| 205 | return(0); |
| 206 | return(!strcasecmp(hd, val)); |
| 207 | } |
| 208 | |
| 209 | void serve(FILE *in, struct conn *conn) |
| 210 | { |
| 211 | int pfds[2]; |
| 212 | FILE *out; |
| 213 | struct hthead *req, *resp; |
| 214 | char *hd, *p; |
| 215 | off_t dlen; |
| 216 | |
| 217 | out = NULL; |
| 218 | req = resp = NULL; |
| 219 | while(1) { |
| 220 | if((req = parsereq(in)) == NULL) |
| 221 | break; |
| 222 | replrest(req, req->url); |
| 223 | if(req->rest[0] == '/') |
| 224 | replrest(req, req->rest + 1); |
| 225 | if((p = strchr(req->rest, '?')) != NULL) |
| 226 | *p = 0; |
| 227 | |
| 228 | if((conn->initreq != NULL) && conn->initreq(conn, req)) |
| 229 | break; |
| 230 | |
| 231 | if(block(plex, EV_WRITE, 60) <= 0) |
| 232 | break; |
| 233 | if(socketpair(PF_UNIX, SOCK_STREAM, 0, pfds)) |
| 234 | break; |
| 235 | if(sendreq(plex, req, pfds[0])) |
| 236 | break; |
| 237 | close(pfds[0]); |
| 238 | out = mtstdopen(pfds[1], 1, 600, "r+"); |
| 239 | |
| 240 | if((hd = getheader(req, "content-length")) != NULL) { |
| 241 | dlen = atoo(hd); |
| 242 | if(dlen > 0) { |
| 243 | if(passdata(in, out, dlen) != dlen) |
| 244 | break; |
| 245 | } |
| 246 | } |
| 247 | if(fflush(out)) |
| 248 | break; |
| 249 | /* Make sure to send EOF */ |
| 250 | shutdown(pfds[1], SHUT_WR); |
| 251 | |
| 252 | if((resp = parseresp(out)) == NULL) |
| 253 | break; |
| 254 | replstr(&resp->ver, req->ver); |
| 255 | |
| 256 | if(!strcmp(req->ver, "HTTP/1.0")) { |
| 257 | writeresp(in, resp); |
| 258 | fprintf(in, "\r\n"); |
| 259 | if((hd = getheader(resp, "content-length")) != NULL) { |
| 260 | dlen = passdata(out, in, -1); |
| 261 | if(dlen != atoo(hd)) |
| 262 | break; |
| 263 | if(!hasheader(req, "connection", "keep-alive")) |
| 264 | break; |
| 265 | } else { |
| 266 | passdata(out, in, -1); |
| 267 | break; |
| 268 | } |
| 269 | if(hasheader(req, "connection", "close") || hasheader(resp, "connection", "close")) |
| 270 | break; |
| 271 | } else if(!strcmp(req->ver, "HTTP/1.1")) { |
| 272 | if((hd = getheader(resp, "content-length")) != NULL) { |
| 273 | writeresp(in, resp); |
| 274 | fprintf(in, "\r\n"); |
| 275 | dlen = passdata(out, in, -1); |
| 276 | if(dlen != atoo(hd)) |
| 277 | break; |
| 278 | } else if(!getheader(resp, "transfer-encoding")) { |
| 279 | headappheader(resp, "Transfer-Encoding", "chunked"); |
| 280 | writeresp(in, resp); |
| 281 | fprintf(in, "\r\n"); |
| 282 | if(passchunks(out, in)) |
| 283 | break; |
| 284 | } else { |
| 285 | writeresp(in, resp); |
| 286 | fprintf(in, "\r\n"); |
| 287 | passdata(out, in, -1); |
| 288 | break; |
| 289 | } |
| 290 | if(hasheader(req, "connection", "close") || hasheader(resp, "connection", "close")) |
| 291 | break; |
| 292 | } else { |
| 293 | break; |
| 294 | } |
| 295 | |
| 296 | fclose(out); |
| 297 | out = NULL; |
| 298 | freehthead(req); |
| 299 | freehthead(resp); |
| 300 | req = resp = NULL; |
| 301 | } |
| 302 | |
| 303 | if(out != NULL) |
| 304 | fclose(out); |
| 305 | if(req != NULL) |
| 306 | freehthead(req); |
| 307 | if(resp != NULL) |
| 308 | freehthead(resp); |
| 309 | fclose(in); |
| 310 | } |
| 311 | |
| 312 | static void plexwatch(struct muth *muth, va_list args) |
| 313 | { |
| 314 | vavar(int, fd); |
| 315 | char *buf; |
| 316 | int ret; |
| 317 | |
| 318 | while(1) { |
| 319 | block(fd, EV_READ, 0); |
| 320 | buf = smalloc(65536); |
| 321 | ret = recv(fd, buf, 65536, 0); |
| 322 | if(ret < 0) { |
| 323 | flog(LOG_WARNING, "received error on rootplex read channel: %s", strerror(errno)); |
| 324 | exit(1); |
| 325 | } else if(ret == 0) { |
| 326 | exit(0); |
| 327 | } |
| 328 | /* Maybe I'd like to implement some protocol in this direction |
| 329 | * some day... */ |
| 330 | free(buf); |
| 331 | } |
| 332 | } |
| 333 | |
| 334 | static void usage(FILE *out) |
| 335 | { |
| 336 | fprintf(out, "usage: htparser [-hSf] [-u USER] [-r ROOT] PORTSPEC... -- ROOT [ARGS...]\n"); |
| 337 | fprintf(out, "\twhere PORTSPEC is HANDLER[:PAR[=VAL][(,PAR[=VAL])...]] (try HANDLER:help)\n"); |
| 338 | fprintf(out, "\tavailable handlers are `plain'.\n"); |
| 339 | } |
| 340 | |
| 341 | static void addport(char *spec) |
| 342 | { |
| 343 | char *nm, *p, *p2, *n; |
| 344 | struct charvbuf pars, vals; |
| 345 | |
| 346 | bufinit(pars); |
| 347 | bufinit(vals); |
| 348 | if((p = strchr(spec, ':')) == NULL) { |
| 349 | nm = spec; |
| 350 | } else { |
| 351 | nm = spec; |
| 352 | *(p++) = 0; |
| 353 | do { |
| 354 | if((n = strchr(p, ',')) != NULL) |
| 355 | *(n++) = 0; |
| 356 | if((p2 = strchr(p, '=')) != NULL) |
| 357 | *(p2++) = 0; |
| 358 | if(!*p) { |
| 359 | usage(stderr); |
| 360 | exit(1); |
| 361 | } |
| 362 | bufadd(pars, p); |
| 363 | if(p2) |
| 364 | bufadd(vals, p2); |
| 365 | else |
| 366 | bufadd(vals, ""); |
| 367 | } while((p = n) != NULL); |
| 368 | } |
| 369 | |
| 370 | /* XXX: It would be nice to decentralize this, but, meh... */ |
| 371 | if(!strcmp(nm, "plain")) { |
| 372 | handleplain(pars.d, pars.b, vals.b); |
| 373 | } else { |
| 374 | flog(LOG_ERR, "htparser: unknown port handler `%s'", nm); |
| 375 | exit(1); |
| 376 | } |
| 377 | |
| 378 | buffree(pars); |
| 379 | buffree(vals); |
| 380 | } |
| 381 | |
| 382 | int main(int argc, char **argv) |
| 383 | { |
| 384 | int c; |
| 385 | int i, s1; |
| 386 | int daemonize, logsys; |
| 387 | char *root; |
| 388 | struct passwd *pwent; |
| 389 | |
| 390 | daemonize = logsys = 0; |
| 391 | root = NULL; |
| 392 | pwent = NULL; |
| 393 | while((c = getopt(argc, argv, "+hSfu:r:")) >= 0) { |
| 394 | switch(c) { |
| 395 | case 'h': |
| 396 | usage(stdout); |
| 397 | exit(0); |
| 398 | case 'f': |
| 399 | daemonize = 1; |
| 400 | break; |
| 401 | case 'S': |
| 402 | logsys = 1; |
| 403 | break; |
| 404 | case 'u': |
| 405 | if((pwent = getpwnam(optarg)) == NULL) { |
| 406 | flog(LOG_ERR, "could not find user %s", optarg); |
| 407 | exit(1); |
| 408 | } |
| 409 | break; |
| 410 | case 'r': |
| 411 | root = optarg; |
| 412 | break; |
| 413 | default: |
| 414 | usage(stderr); |
| 415 | exit(1); |
| 416 | } |
| 417 | } |
| 418 | if((argc - optind) < 3) { |
| 419 | usage(stderr); |
| 420 | exit(1); |
| 421 | } |
| 422 | s1 = 0; |
| 423 | for(i = optind; i < argc; i++) { |
| 424 | if(!strcmp(argv[i], "--")) |
| 425 | break; |
| 426 | s1 = 1; |
| 427 | addport(argv[i]); |
| 428 | } |
| 429 | if(!s1 || (i == argc)) { |
| 430 | usage(stderr); |
| 431 | exit(1); |
| 432 | } |
| 433 | if((plex = stdmkchild(argv + ++i)) < 0) { |
| 434 | flog(LOG_ERR, "could not spawn root multiplexer: %s", strerror(errno)); |
| 435 | return(1); |
| 436 | } |
| 437 | mustart(plexwatch, plex); |
| 438 | if(logsys) |
| 439 | opensyslog(); |
| 440 | if(root) { |
| 441 | if(chroot(root)) { |
| 442 | flog(LOG_ERR, "could not chroot to %s: %s", root, strerror(errno)); |
| 443 | exit(1); |
| 444 | } |
| 445 | } |
| 446 | if(pwent) { |
| 447 | if(setgid(pwent->pw_gid)) { |
| 448 | flog(LOG_ERR, "could not switch group to %i: %s", (int)pwent->pw_gid, strerror(errno)); |
| 449 | exit(1); |
| 450 | } |
| 451 | if(setuid(pwent->pw_uid)) { |
| 452 | flog(LOG_ERR, "could not switch user to %i: %s", (int)pwent->pw_uid, strerror(errno)); |
| 453 | exit(1); |
| 454 | } |
| 455 | } |
| 456 | if(daemonize) { |
| 457 | daemon(0, 0); |
| 458 | } |
| 459 | ioloop(); |
| 460 | return(0); |
| 461 | } |