Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/netinet/accf_http.c
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1 /* $NetBSD: accf_http.c,v 1.2 2008/10/14 13:05:44 ad 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 1.2 2008/10/14 13:05:44 ad 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/lkm.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 /* check for GET/HEAD */ 47 static void sohashttpget(struct socket *so, void *arg, int waitflag); 48 /* check for HTTP/1.0 or HTTP/1.1 */ 49 static void soparsehttpvers(struct socket *so, void *arg, int waitflag); 50 /* check for end of HTTP/1.x request */ 51 static void soishttpconnected(struct socket *so, void *arg, int waitflag); 52 /* strcmp on an mbuf chain */ 53 static int mbufstrcmp(struct mbuf *m, struct mbuf *npkt, int offset, const char *cmp); 54 /* strncmp on an mbuf chain */ 55 static int mbufstrncmp(struct mbuf *m, struct mbuf *npkt, int offset, 56 int len, const char *cmp); 57 /* socketbuffer is full */ 58 static int sbfull(struct sockbuf *sb); 59 60 static struct accept_filter accf_http_filter = { 61 .accf_name = "httpready", 62 .accf_callback = sohashttpget, 63 }; 64 65 /* 66 * Names of HTTP Accept filter sysctl objects 67 */ 68 69 #define ACCFCTL_PARSEVER 1 /* Parse HTTP version */ 70 71 static int parse_http_version = 1; 72 73 SYSCTL_SETUP(sysctl_net_inet_accf__http_setup, "sysctl net.inet.accf.http subtree setup") 74 { 75 sysctl_createv(clog, 0, NULL, NULL, 76 CTLFLAG_PERMANENT, 77 CTLTYPE_NODE, "net", NULL, 78 NULL, 0, NULL, 0, 79 CTL_NET, CTL_EOL); 80 sysctl_createv(clog, 0, NULL, NULL, 81 CTLFLAG_PERMANENT, 82 CTLTYPE_NODE, "inet", NULL, 83 NULL, 0, NULL, 0, 84 CTL_NET, PF_INET, CTL_EOL); 85 sysctl_createv(clog, 0, NULL, NULL, 86 CTLFLAG_PERMANENT, 87 CTLTYPE_NODE, "accf", NULL, 88 NULL, 0, NULL, 0, 89 CTL_NET, PF_INET, SO_ACCEPTFILTER, CTL_EOL); 90 sysctl_createv(clog, 0, NULL, NULL, 91 CTLFLAG_PERMANENT, 92 CTLTYPE_NODE, "http", 93 SYSCTL_DESCR("HTTP accept filter"), 94 NULL, 0, NULL, 0, 95 CTL_NET, PF_INET, SO_ACCEPTFILTER, ACCF_HTTP, CTL_EOL); 96 sysctl_createv(clog, 0, NULL, NULL, 97 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 98 CTLTYPE_INT, "parsehttpversion", 99 SYSCTL_DESCR("Parse http version so that non " 100 "1.x requests work"), 101 NULL, 0, &parse_http_version, 0, 102 CTL_NET, PF_INET, SO_ACCEPTFILTER, ACCF_HTTP, 103 ACCFCTL_PARSEVER, CTL_EOL); 104 } 105 106 void accf_httpattach(int); 107 void accf_httpattach(int num) 108 { 109 accept_filt_generic_mod_event(NULL, LKM_E_LOAD, &accf_http_filter); 110 } 111 112 /* 113 * This code is to make HTTP ready accept filer as LKM. 114 * To compile as LKM we need to move this set of code into 115 * another file and include this file for compilation when 116 * making LKM 117 */ 118 119 #ifdef _LKM 120 static int accf_http_handle(struct lkm_table * lkmtp, int cmd); 121 int accf_http_lkmentry(struct lkm_table * lkmtp, int cmd, int ver); 122 123 MOD_MISC("accf_http"); 124 125 static int accf_http_handle(struct lkm_table * lkmtp, int cmd) 126 { 127 128 return accept_filt_generic_mod_event(lkmtp, cmd, &accf_http_filter); 129 } 130 131 /* 132 * the module entry point. 133 */ 134 int 135 accf_http_lkmentry(struct lkm_table *lkmtp, int cmd, int ver) 136 { 137 DISPATCH(lkmtp, cmd, ver, accf_http_handle, accf_http_handle, 138 accf_http_handle) 139 } 140 #endif 141 142 #ifdef ACCF_HTTP_DEBUG 143 #define DPRINT(fmt, args...) \ 144 do { \ 145 printf("%s:%d: " fmt "\n", __func__, __LINE__, ##args); \ 146 } while (0) 147 #else 148 #define DPRINT(fmt, args...) 149 #endif 150 151 static int 152 sbfull(struct sockbuf *sb) 153 { 154 155 DPRINT("sbfull, cc(%ld) >= hiwat(%ld): %d, " 156 "mbcnt(%ld) >= mbmax(%ld): %d", 157 sb->sb_cc, sb->sb_hiwat, sb->sb_cc >= sb->sb_hiwat, 158 sb->sb_mbcnt, sb->sb_mbmax, sb->sb_mbcnt >= sb->sb_mbmax); 159 return (sb->sb_cc >= sb->sb_hiwat || sb->sb_mbcnt >= sb->sb_mbmax); 160 } 161 162 /* 163 * start at mbuf m, (must provide npkt if exists) 164 * starting at offset in m compare characters in mbuf chain for 'cmp' 165 */ 166 static int 167 mbufstrcmp(struct mbuf *m, struct mbuf *npkt, int offset, const char *cmp) 168 { 169 struct mbuf *n; 170 171 for (; m != NULL; m = n) { 172 n = npkt; 173 if (npkt) 174 npkt = npkt->m_nextpkt; 175 for (; m; m = m->m_next) { 176 for (; offset < m->m_len; offset++, cmp++) { 177 if (*cmp == '\0') 178 return (1); 179 else if (*cmp != *(mtod(m, char *) + offset)) 180 return (0); 181 } 182 if (*cmp == '\0') 183 return (1); 184 offset = 0; 185 } 186 } 187 return (0); 188 } 189 190 /* 191 * start at mbuf m, (must provide npkt if exists) 192 * starting at offset in m compare characters in mbuf chain for 'cmp' 193 * stop at 'max' characters 194 */ 195 static int 196 mbufstrncmp(struct mbuf *m, struct mbuf *npkt, int offset, int len, const char *cmp) 197 { 198 struct mbuf *n; 199 200 for (; m != NULL; m = n) { 201 n = npkt; 202 if (npkt) 203 npkt = npkt->m_nextpkt; 204 for (; m; m = m->m_next) { 205 for (; offset < m->m_len; offset++, cmp++, len--) { 206 if (len == 0 || *cmp == '\0') 207 return (1); 208 else if (*cmp != *(mtod(m, char *) + offset)) 209 return (0); 210 } 211 if (len == 0 || *cmp == '\0') 212 return (1); 213 offset = 0; 214 } 215 } 216 return (0); 217 } 218 219 #define STRSETUP(sptr, slen, str) \ 220 do { \ 221 sptr = str; \ 222 slen = sizeof(str) - 1; \ 223 } while(0) 224 225 static void 226 sohashttpget(struct socket *so, void *arg, int waitflag) 227 { 228 229 if ((so->so_state & SS_CANTRCVMORE) == 0 && !sbfull(&so->so_rcv)) { 230 struct mbuf *m; 231 const char *cmp; 232 int cmplen, cc; 233 234 m = so->so_rcv.sb_mb; 235 cc = so->so_rcv.sb_cc - 1; 236 if (cc < 1) 237 return; 238 switch (*mtod(m, char *)) { 239 case 'G': 240 STRSETUP(cmp, cmplen, "ET "); 241 break; 242 case 'H': 243 STRSETUP(cmp, cmplen, "EAD "); 244 break; 245 default: 246 goto fallout; 247 } 248 if (cc < cmplen) { 249 if (mbufstrncmp(m, m->m_nextpkt, 1, cc, cmp) == 1) { 250 DPRINT("short cc (%d) but mbufstrncmp ok", cc); 251 return; 252 } else { 253 DPRINT("short cc (%d) mbufstrncmp failed", cc); 254 goto fallout; 255 } 256 } 257 if (mbufstrcmp(m, m->m_nextpkt, 1, cmp) == 1) { 258 DPRINT("mbufstrcmp ok"); 259 if (parse_http_version == 0) 260 soishttpconnected(so, arg, waitflag); 261 else 262 soparsehttpvers(so, arg, waitflag); 263 return; 264 } 265 DPRINT("mbufstrcmp bad"); 266 } 267 268 fallout: 269 DPRINT("fallout"); 270 so->so_upcall = NULL; 271 so->so_rcv.sb_flags &= ~SB_UPCALL; 272 soisconnected(so); 273 return; 274 } 275 276 static void 277 soparsehttpvers(struct socket *so, void *arg, int waitflag) 278 { 279 struct mbuf *m, *n; 280 int i, cc, spaces, inspaces; 281 282 if ((so->so_state & SS_CANTRCVMORE) != 0 || sbfull(&so->so_rcv)) 283 goto fallout; 284 285 m = so->so_rcv.sb_mb; 286 cc = so->so_rcv.sb_cc; 287 inspaces = spaces = 0; 288 for (m = so->so_rcv.sb_mb; m; m = n) { 289 n = m->m_nextpkt; 290 for (; m; m = m->m_next) { 291 for (i = 0; i < m->m_len; i++, cc--) { 292 switch (*(mtod(m, char *) + i)) { 293 case ' ': 294 /* tabs? '\t' */ 295 if (!inspaces) { 296 spaces++; 297 inspaces = 1; 298 } 299 break; 300 case '\r': 301 case '\n': 302 DPRINT("newline"); 303 goto fallout; 304 default: 305 if (spaces != 2) { 306 inspaces = 0; 307 break; 308 } 309 310 /* 311 * if we don't have enough characters 312 * left (cc < sizeof("HTTP/1.0") - 1) 313 * then see if the remaining ones 314 * are a request we can parse. 315 */ 316 if (cc < sizeof("HTTP/1.0") - 1) { 317 if (mbufstrncmp(m, n, i, cc, 318 "HTTP/1.") == 1) { 319 DPRINT("ok"); 320 goto readmore; 321 } else { 322 DPRINT("bad"); 323 goto fallout; 324 } 325 } else if ( 326 mbufstrcmp(m, n, i, "HTTP/1.0") || 327 mbufstrcmp(m, n, i, "HTTP/1.1")) { 328 DPRINT("ok"); 329 soishttpconnected(so, 330 arg, waitflag); 331 return; 332 } else { 333 DPRINT("bad"); 334 goto fallout; 335 } 336 } 337 } 338 } 339 } 340 readmore: 341 DPRINT("readmore"); 342 /* 343 * if we hit here we haven't hit something 344 * we don't understand or a newline, so try again 345 */ 346 so->so_upcall = soparsehttpvers; 347 so->so_rcv.sb_flags |= SB_UPCALL; 348 return; 349 350 fallout: 351 DPRINT("fallout"); 352 so->so_upcall = NULL; 353 so->so_rcv.sb_flags &= ~SB_UPCALL; 354 soisconnected(so); 355 return; 356 } 357 358 359 #define NCHRS 3 360 361 static void 362 soishttpconnected(struct socket *so, void *arg, int waitflag) 363 { 364 char a, b, c; 365 struct mbuf *m, *n; 366 int ccleft, copied; 367 368 DPRINT("start"); 369 if ((so->so_state & SS_CANTRCVMORE) != 0 || sbfull(&so->so_rcv)) 370 goto gotit; 371 372 /* 373 * Walk the socketbuffer and copy the last NCHRS (3) into a, b, and c 374 * copied - how much we've copied so far 375 * ccleft - how many bytes remaining in the socketbuffer 376 * just loop over the mbufs subtracting from 'ccleft' until we only 377 * have NCHRS left 378 */ 379 copied = 0; 380 ccleft = so->so_rcv.sb_cc; 381 if (ccleft < NCHRS) 382 goto readmore; 383 a = b = c = '\0'; 384 for (m = so->so_rcv.sb_mb; m; m = n) { 385 n = m->m_nextpkt; 386 for (; m; m = m->m_next) { 387 ccleft -= m->m_len; 388 if (ccleft <= NCHRS) { 389 char *src; 390 int tocopy; 391 392 tocopy = (NCHRS - ccleft) - copied; 393 src = mtod(m, char *) + (m->m_len - tocopy); 394 395 while (tocopy--) { 396 switch (copied++) { 397 case 0: 398 a = *src++; 399 break; 400 case 1: 401 b = *src++; 402 break; 403 case 2: 404 c = *src++; 405 break; 406 } 407 } 408 } 409 } 410 } 411 if (c == '\n' && (b == '\n' || (b == '\r' && a == '\n'))) { 412 /* we have all request headers */ 413 goto gotit; 414 } 415 416 readmore: 417 so->so_upcall = soishttpconnected; 418 so->so_rcv.sb_flags |= SB_UPCALL; 419 return; 420 421 gotit: 422 so->so_upcall = NULL; 423 so->so_rcv.sb_flags &= ~SB_UPCALL; 424 soisconnected(so); 425 return; 426 }
Cache object: 56dfeb7a9d6b7d8fbeb9496c5d699f91
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