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comparison: src/server/daemon/http.c

src/server/daemon/http.c

changeset 102
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child 104
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101:7fbcdbad0baa 102:136a76e293b5
1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
3 *
4 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
5 *
6 * THE BSD LICENSE
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 *
11 * Redistributions of source code must retain the above copyright notice, this
12 * list of conditions and the following disclaimer.
13 * Redistributions in binary form must reproduce the above copyright notice,
14 * this list of conditions and the following disclaimer in the documentation
15 * and/or other materials provided with the distribution.
16 *
17 * Neither the name of the nor the names of its contributors may be
18 * used to endorse or promote products derived from this software without
19 * specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
25 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
28 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
30 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
31 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 #include <stdio.h>
35 #include <stdlib.h>
36
37 #include "http.h"
38 #include "protocol.h"
39
40 #include "../util/pblock.h"
41 #include "../util/pool.h"
42 #include "../util/util.h"
43
44
45 static int http_etag = 1;
46
47 /* --------------------------- http_format_etag --------------------------- */
48
49 NSAPI_PUBLIC void http_format_etag(Session *sn, Request *rq, char *etagp, int etaglen, off_t size, time_t mtime)
50 {
51 /*
52 * Heuristic for weak/strong validator: if the request was made within
53 * a second of the last-modified date, then we send a weak Etag.
54 */
55 if (rq->req_start - mtime <= 1) {
56 /* Send a weak Etag */
57 *etagp++ = 'W';
58 *etagp++ = '/';
59 etaglen -= 2;
60 }
61
62 /*
63 * Create an Etag out of the metadata (size, mtime) to obtain Etag
64 * uniqueness.
65 */
66 util_snprintf(etagp, etaglen, "\"%x-%x\"", (int)size, (int)mtime);
67 }
68
69
70 /* --------------------------- http_weaken_etag --------------------------- */
71
72 NSAPI_PUBLIC void http_weaken_etag(Session *sn, Request *rq)
73 {
74 /* Replace any existing strong Etag with a weak Etag */
75 pb_param *pp = pblock_findkey(pb_key_etag, rq->srvhdrs);
76 if (pp) {
77 if (pp->value[0] != 'W' || pp->value[1] != '/') {
78 char *weak = (char *) pool_malloc(sn->pool, 2 + strlen(pp->value) + 1);
79
80 weak[0] = 'W';
81 weak[1] = '/';
82 strcpy(weak + 2, pp->value);
83
84 pool_free(sn->pool, pp->value);
85 pp->value = weak;
86 }
87 }
88 }
89
90
91 /* ------------------------------ match_etag ------------------------------ */
92
93 NSAPI_PUBLIC int http_match_etag(const char *header, const char *etag, int strong)
94 {
95 if (!etag)
96 return 0; /* mismatch */
97
98 if (header[0] == '*')
99 return 1; /* match */
100
101 if (etag[0] == 'W' && etag[1] == '/') {
102 /* Weak Etags never match when using the strong validator */
103 if (strong)
104 return 0; /* mismatch */
105
106 etag += 2;
107 }
108
109 /* Look for Etag in header */
110 const char *found = strstr(header, etag);
111 if (!found)
112 return 0; /* mismatch */
113
114 /* Weak Etags never match when using the strong validator */
115 if (strong && found >= header + 2 && found[-2] == 'W' && found[-1] == '/')
116 return 0; /* mismatch */
117
118 return 1; /* match */
119 }
120
121
122 /* ----------------------- http_check_preconditions ----------------------- */
123
124 NSAPI_PUBLIC int http_check_preconditions(Session *sn, Request *rq, struct tm *mtm, const char *etag)
125 {
126 char *header;
127
128 /* If-modified-since */
129 header = pblock_findkeyval(pb_key_if_modified_since, rq->headers);
130 if (header) {
131 if (mtm && util_later_than(mtm, header)) {
132 protocol_status(sn, rq, PROTOCOL_NOT_MODIFIED, NULL);
133 return REQ_ABORTED;
134 }
135 }
136
137 /* If-unmodified-since */
138 header = pblock_findkeyval(pb_key_if_unmodified_since, rq->headers);
139 if (header) {
140 if (mtm && !util_later_than(mtm, header)) {
141 //PRTime temptime;
142 //PRStatus status = PR_ParseTimeString(header, PR_TRUE, &temptime);
143 //if (status == PR_SUCCESS) {
144 // http_status(sn, rq, PROTOCOL_PRECONDITION_FAIL, NULL);
145 // return REQ_ABORTED;
146 //}
147 }
148 }
149
150 /* If-none-match */
151 header = pblock_findkeyval(pb_key_if_none_match, rq->headers);
152 if (header) {
153 /* If the If-none-match header matches the current Etag... */
154 if (ISMGET(rq) || ISMHEAD(rq)) {
155 if (http_match_etag(header, etag, PR_FALSE)) {
156 protocol_status(sn, rq, PROTOCOL_NOT_MODIFIED, NULL);
157 return REQ_ABORTED;
158 }
159 } else {
160 if (http_match_etag(header, etag, PR_TRUE)) {
161 protocol_status(sn, rq, PROTOCOL_PRECONDITION_FAIL, NULL);
162 return REQ_ABORTED;
163 }
164 }
165 }
166
167 /* If-match */
168 header = pblock_findkeyval(pb_key_if_match, rq->headers);
169 if (header) {
170 /* If the If-match header matches the current Etag... */
171 if (!http_match_etag(header, etag, PR_TRUE)) {
172 protocol_status(sn, rq, PROTOCOL_PRECONDITION_FAIL, NULL);
173 return REQ_ABORTED;
174 }
175 }
176
177 return REQ_PROCEED;
178 }
179
180
181 /* ---------------------------- http_set_finfo ---------------------------- */
182
183 static inline int set_finfo(Session *sn, Request *rq, off_t size, time_t mtime)
184 {
185 struct tm mtms;
186 struct tm *mtm = system_gmtime(&mtime, &mtms);
187 pb_param *pp;
188
189 /* Insert Last-modified */
190 if (mtm) {
191 pp = pblock_key_param_create(rq->srvhdrs, pb_key_last_modified, NULL,
192 HTTP_DATE_LEN);
193 if (!pp || !pp->value)
194 return REQ_ABORTED;
195 strftime(pp->value, HTTP_DATE_LEN, HTTP_DATE_FMT, mtm);
196 pblock_kpinsert(pb_key_last_modified, pp, rq->srvhdrs);
197 }
198
199 /* Insert Content-length */
200 const int content_length_size = 21;
201 pp = pblock_key_param_create(rq->srvhdrs, pb_key_content_length, NULL,
202 content_length_size);
203 if (!pp || !pp->value)
204 return REQ_ABORTED;
205 snprintf(pp->value, content_length_size, "%lld", (long long)size);
206 pblock_kpinsert(pb_key_content_length, pp, rq->srvhdrs);
207
208 char *etag;
209 if (http_etag) {
210 /* Insert Etag */
211 pp = pblock_key_param_create(rq->srvhdrs, pb_key_etag, NULL, MAX_ETAG);
212 if (!pp || !pp->value)
213 return REQ_ABORTED;
214 http_format_etag(sn, rq, pp->value, MAX_ETAG, size, mtime);
215 pblock_kpinsert(pb_key_etag, pp, rq->srvhdrs);
216 etag = pp->value;
217 } else {
218 etag = NULL;
219 }
220
221 /* Check If-modified-since, etc. */
222 return http_check_preconditions(sn, rq, mtm, etag);
223 }
224
225 NSAPI_PUBLIC int http_set_finfo(Session *sn, Request *rq, struct stat *finfo)
226 {
227 return set_finfo(sn, rq, finfo->st_size, finfo->st_mtime);
228 }
229
230

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