Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/netinet/accf_http.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
1 /* $NetBSD: accf_http.c,v 1.10 2020/03/16 21:20:11 pgoyette Exp $ */ 2 3 /*- 4 * Copyright (c) 2000 Paycounter, Inc. 5 * Author: Alfred Perlstein <alfred@paycounter.com>, <alfred@FreeBSD.org> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __KERNEL_RCSID(0, "$NetBSD: accf_http.c,v 1.10 2020/03/16 21:20:11 pgoyette Exp $"); 32 33 #define ACCEPT_FILTER_MOD 34 35 #include <sys/param.h> 36 #include <sys/kernel.h> 37 #include <sys/mbuf.h> 38 #include <sys/module.h> 39 #include <sys/signalvar.h> 40 #include <sys/sysctl.h> 41 #include <sys/socket.h> 42 #include <sys/socketvar.h> 43 44 #include <netinet/accept_filter.h> 45 46 #include "ioconf.h" 47 48 MODULE(MODULE_CLASS_MISC, accf_httpready, NULL); 49 50 /* check for GET/HEAD */ 51 static void sohashttpget(struct socket *so, void *arg, int events, int waitflag); 52 /* check for HTTP/1.0 or HTTP/1.1 */ 53 static void soparsehttpvers(struct socket *so, void *arg, int events, int waitflag); 54 /* check for end of HTTP/1.x request */ 55 static void soishttpconnected(struct socket *so, void *arg, int events, int waitflag); 56 /* strcmp on an mbuf chain */ 57 static int mbufstrcmp(struct mbuf *m, struct mbuf *npkt, int offset, const char *cmp); 58 /* strncmp on an mbuf chain */ 59 static int mbufstrncmp(struct mbuf *m, struct mbuf *npkt, int offset, 60 int len, const char *cmp); 61 /* socketbuffer is full */ 62 static int sbfull(struct sockbuf *sb); 63 64 static struct accept_filter accf_http_filter = { 65 .accf_name = "httpready", 66 .accf_callback = sohashttpget, 67 }; 68 69 /* 70 * Names of HTTP Accept filter sysctl objects 71 */ 72 73 #define ACCFCTL_PARSEVER 1 /* Parse HTTP version */ 74 75 static int parse_http_version = 1; 76 77 void 78 accf_httpattach(int junk) 79 { 80 81 } 82 83 SYSCTL_SETUP(accf_sysctl_setup, "accf sysctl") 84 { 85 86 sysctl_createv(clog, 0, NULL, NULL, 87 CTLFLAG_PERMANENT, 88 CTLTYPE_NODE, "inet", NULL, 89 NULL, 0, NULL, 0, 90 CTL_NET, PF_INET, CTL_EOL); 91 sysctl_createv(clog, 0, NULL, NULL, 92 CTLFLAG_PERMANENT, 93 CTLTYPE_NODE, "accf", NULL, 94 NULL, 0, NULL, 0, 95 CTL_NET, PF_INET, SO_ACCEPTFILTER, CTL_EOL); 96 sysctl_createv(clog, 0, NULL, NULL, 97 CTLFLAG_PERMANENT, 98 CTLTYPE_NODE, "http", 99 SYSCTL_DESCR("HTTP accept filter"), 100 NULL, 0, NULL, 0, 101 CTL_NET, PF_INET, SO_ACCEPTFILTER, ACCF_HTTP, CTL_EOL); 102 sysctl_createv(clog, 0, NULL, NULL, 103 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 104 CTLTYPE_INT, "parsehttpversion", 105 SYSCTL_DESCR("Parse http version so that non " 106 "1.x requests work"), 107 NULL, 0, &parse_http_version, 0, 108 CTL_NET, PF_INET, SO_ACCEPTFILTER, ACCF_HTTP, 109 ACCFCTL_PARSEVER, CTL_EOL); 110 } 111 112 static int 113 accf_httpready_modcmd(modcmd_t cmd, void *arg) 114 { 115 int error; 116 117 switch (cmd) { 118 case MODULE_CMD_INIT: 119 error = accept_filt_add(&accf_http_filter); 120 return 0; 121 122 case MODULE_CMD_FINI: 123 error = accept_filt_del(&accf_http_filter); 124 return error; 125 126 default: 127 return ENOTTY; 128 } 129 } 130 131 #ifdef ACCF_HTTP_DEBUG 132 #define DPRINT(fmt, args...) \ 133 do { \ 134 printf("%s:%d: " fmt "\n", __func__, __LINE__, ##args); \ 135 } while (0) 136 #else 137 #define DPRINT(fmt, args...) 138 #endif 139 140 static int 141 sbfull(struct sockbuf *sb) 142 { 143 144 DPRINT("sbfull, cc(%ld) >= hiwat(%ld): %d, " 145 "mbcnt(%ld) >= mbmax(%ld): %d", 146 sb->sb_cc, sb->sb_hiwat, sb->sb_cc >= sb->sb_hiwat, 147 sb->sb_mbcnt, sb->sb_mbmax, sb->sb_mbcnt >= sb->sb_mbmax); 148 return (sb->sb_cc >= sb->sb_hiwat || sb->sb_mbcnt >= sb->sb_mbmax); 149 } 150 151 /* 152 * start at mbuf m, (must provide npkt if exists) 153 * starting at offset in m compare characters in mbuf chain for 'cmp' 154 */ 155 static int 156 mbufstrcmp(struct mbuf *m, struct mbuf *npkt, int offset, const char *cmp) 157 { 158 struct mbuf *n; 159 160 for (; m != NULL; m = n) { 161 n = npkt; 162 if (npkt) 163 npkt = npkt->m_nextpkt; 164 for (; m; m = m->m_next) { 165 for (; offset < m->m_len; offset++, cmp++) { 166 if (*cmp == '\0') 167 return (1); 168 else if (*cmp != *(mtod(m, char *) + offset)) 169 return (0); 170 } 171 if (*cmp == '\0') 172 return (1); 173 offset = 0; 174 } 175 } 176 return (0); 177 } 178 179 /* 180 * start at mbuf m, (must provide npkt if exists) 181 * starting at offset in m compare characters in mbuf chain for 'cmp' 182 * stop at 'max' characters 183 */ 184 static int 185 mbufstrncmp(struct mbuf *m, struct mbuf *npkt, int offset, int len, const char *cmp) 186 { 187 struct mbuf *n; 188 189 for (; m != NULL; m = n) { 190 n = npkt; 191 if (npkt) 192 npkt = npkt->m_nextpkt; 193 for (; m; m = m->m_next) { 194 for (; offset < m->m_len; offset++, cmp++, len--) { 195 if (len == 0 || *cmp == '\0') 196 return (1); 197 else if (*cmp != *(mtod(m, char *) + offset)) 198 return (0); 199 } 200 if (len == 0 || *cmp == '\0') 201 return (1); 202 offset = 0; 203 } 204 } 205 return (0); 206 } 207 208 #define STRSETUP(sptr, slen, str) \ 209 do { \ 210 sptr = str; \ 211 slen = sizeof(str) - 1; \ 212 } while(0) 213 214 static void 215 sohashttpget(struct socket *so, void *arg, int events, int waitflag) 216 { 217 218 if ((so->so_state & SS_CANTRCVMORE) == 0 && !sbfull(&so->so_rcv)) { 219 struct mbuf *m; 220 const char *cmp; 221 int cmplen, cc; 222 223 m = so->so_rcv.sb_mb; 224 cc = so->so_rcv.sb_cc - 1; 225 if (cc < 1) 226 return; 227 switch (*mtod(m, char *)) { 228 case 'G': 229 STRSETUP(cmp, cmplen, "ET "); 230 break; 231 case 'H': 232 STRSETUP(cmp, cmplen, "EAD "); 233 break; 234 default: 235 goto fallout; 236 } 237 if (cc < cmplen) { 238 if (mbufstrncmp(m, m->m_nextpkt, 1, cc, cmp) == 1) { 239 DPRINT("short cc (%d) but mbufstrncmp ok", cc); 240 return; 241 } else { 242 DPRINT("short cc (%d) mbufstrncmp failed", cc); 243 goto fallout; 244 } 245 } 246 if (mbufstrcmp(m, m->m_nextpkt, 1, cmp) == 1) { 247 DPRINT("mbufstrcmp ok"); 248 if (parse_http_version == 0) 249 soishttpconnected(so, arg, events, waitflag); 250 else 251 soparsehttpvers(so, arg, events, waitflag); 252 return; 253 } 254 DPRINT("mbufstrcmp bad"); 255 } 256 257 fallout: 258 DPRINT("fallout"); 259 so->so_upcall = NULL; 260 so->so_rcv.sb_flags &= ~SB_UPCALL; 261 soisconnected(so); 262 return; 263 } 264 265 static void 266 soparsehttpvers(struct socket *so, void *arg, int events, int waitflag) 267 { 268 struct mbuf *m, *n; 269 int i, cc, spaces, inspaces; 270 271 if ((so->so_state & SS_CANTRCVMORE) != 0 || sbfull(&so->so_rcv)) 272 goto fallout; 273 274 m = so->so_rcv.sb_mb; 275 cc = so->so_rcv.sb_cc; 276 inspaces = spaces = 0; 277 for (m = so->so_rcv.sb_mb; m; m = n) { 278 n = m->m_nextpkt; 279 for (; m; m = m->m_next) { 280 for (i = 0; i < m->m_len; i++, cc--) { 281 switch (*(mtod(m, char *) + i)) { 282 case ' ': 283 /* tabs? '\t' */ 284 if (!inspaces) { 285 spaces++; 286 inspaces = 1; 287 } 288 break; 289 case '\r': 290 case '\n': 291 DPRINT("newline"); 292 goto fallout; 293 default: 294 if (spaces != 2) { 295 inspaces = 0; 296 break; 297 } 298 299 /* 300 * if we don't have enough characters 301 * left (cc < sizeof("HTTP/1.0") - 1) 302 * then see if the remaining ones 303 * are a request we can parse. 304 */ 305 if (cc < sizeof("HTTP/1.0") - 1) { 306 if (mbufstrncmp(m, n, i, cc, 307 "HTTP/1.") == 1) { 308 DPRINT("ok"); 309 goto readmore; 310 } else { 311 DPRINT("bad"); 312 goto fallout; 313 } 314 } else if ( 315 mbufstrcmp(m, n, i, "HTTP/1.0") || 316 mbufstrcmp(m, n, i, "HTTP/1.1")) { 317 DPRINT("ok"); 318 soishttpconnected(so, 319 arg, events, waitflag); 320 return; 321 } else { 322 DPRINT("bad"); 323 goto fallout; 324 } 325 } 326 } 327 } 328 } 329 readmore: 330 DPRINT("readmore"); 331 /* 332 * if we hit here we haven't hit something 333 * we don't understand or a newline, so try again 334 */ 335 so->so_upcall = soparsehttpvers; 336 so->so_rcv.sb_flags |= SB_UPCALL; 337 return; 338 339 fallout: 340 DPRINT("fallout"); 341 so->so_upcall = NULL; 342 so->so_rcv.sb_flags &= ~SB_UPCALL; 343 soisconnected(so); 344 return; 345 } 346 347 348 #define NCHRS 3 349 350 static void 351 soishttpconnected(struct socket *so, void *arg, int events, int waitflag) 352 { 353 char a, b, c; 354 struct mbuf *m, *n; 355 int ccleft, copied; 356 357 DPRINT("start"); 358 if ((so->so_state & SS_CANTRCVMORE) != 0 || sbfull(&so->so_rcv)) 359 goto gotit; 360 361 /* 362 * Walk the socketbuffer and copy the last NCHRS (3) into a, b, and c 363 * copied - how much we've copied so far 364 * ccleft - how many bytes remaining in the socketbuffer 365 * just loop over the mbufs subtracting from 'ccleft' until we only 366 * have NCHRS left 367 */ 368 copied = 0; 369 ccleft = so->so_rcv.sb_cc; 370 if (ccleft < NCHRS) 371 goto readmore; 372 a = b = c = '\0'; 373 for (m = so->so_rcv.sb_mb; m; m = n) { 374 n = m->m_nextpkt; 375 for (; m; m = m->m_next) { 376 ccleft -= m->m_len; 377 if (ccleft <= NCHRS) { 378 char *src; 379 int tocopy; 380 381 tocopy = (NCHRS - ccleft) - copied; 382 src = mtod(m, char *) + (m->m_len - tocopy); 383 384 while (tocopy--) { 385 switch (copied++) { 386 case 0: 387 a = *src++; 388 break; 389 case 1: 390 b = *src++; 391 break; 392 case 2: 393 c = *src++; 394 break; 395 } 396 } 397 } 398 } 399 } 400 if (c == '\n' && (b == '\n' || (b == '\r' && a == '\n'))) { 401 /* we have all request headers */ 402 goto gotit; 403 } 404 405 readmore: 406 so->so_upcall = soishttpconnected; 407 so->so_rcv.sb_flags |= SB_UPCALL; 408 return; 409 410 gotit: 411 so->so_upcall = NULL; 412 so->so_rcv.sb_flags &= ~SB_UPCALL; 413 soisconnected(so); 414 return; 415 }
Cache object: b9719b0fa979089d2ab3907b364784a9
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]