1 /* $OpenBSD: mod_log_agent.c,v 1.8 2004/12/02 19:42:48 henning Exp $ */
2
3 /* ====================================================================
4 * The Apache Software License, Version 1.1
5 *
6 * Copyright (c) 2000-2003 The Apache Software Foundation. All rights
7 * reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
20 *
21 * 3. The end-user documentation included with the redistribution,
22 * if any, must include the following acknowledgment:
23 * "This product includes software developed by the
24 * Apache Software Foundation (http://www.apache.org/)."
25 * Alternately, this acknowledgment may appear in the software itself,
26 * if and wherever such third-party acknowledgments normally appear.
27 *
28 * 4. The names "Apache" and "Apache Software Foundation" must
29 * not be used to endorse or promote products derived from this
30 * software without prior written permission. For written
31 * permission, please contact apache@apache.org.
32 *
33 * 5. Products derived from this software may not be called "Apache",
34 * nor may "Apache" appear in their name, without prior written
35 * permission of the Apache Software Foundation.
36 *
37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48 * SUCH DAMAGE.
49 * ====================================================================
50 *
51 * This software consists of voluntary contributions made by many
52 * individuals on behalf of the Apache Software Foundation. For more
53 * information on the Apache Software Foundation, please see
54 * <http://www.apache.org/>.
55 *
56 * Portions of this software are based upon public domain software
57 * originally written at the National Center for Supercomputing Applications,
58 * University of Illinois, Urbana-Champaign.
59 */
60
61
62 #include "httpd.h"
63 #include "http_config.h"
64 #include "http_log.h"
65 #include "http_main.h"
66 #include "fdcache.h"
67
68 module agent_log_module;
69
70 static int xfer_flags = (O_WRONLY | O_APPEND | O_CREAT);
71 static mode_t xfer_mode = (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
72
73 typedef struct {
74 char *fname;
75 int agent_fd;
76 } agent_log_state;
77
make_agent_log_state(pool * p,server_rec * s)78 static void *make_agent_log_state(pool *p, server_rec *s)
79 {
80 agent_log_state *cls =
81 (agent_log_state *) ap_palloc(p, sizeof(agent_log_state));
82
83 cls->fname = "";
84 cls->agent_fd = -1;
85
86 return (void *) cls;
87 }
88
set_agent_log(cmd_parms * parms,void * dummy,char * arg)89 static const char *set_agent_log(cmd_parms *parms, void *dummy, char *arg)
90 {
91 agent_log_state *cls = ap_get_module_config(parms->server->module_config,
92 &agent_log_module);
93
94 cls->fname = arg;
95 return NULL;
96 }
97
98 static const command_rec agent_log_cmds[] =
99 {
100 {"AgentLog", set_agent_log, NULL, RSRC_CONF, TAKE1,
101 "the filename of the agent log"},
102 {NULL}
103 };
104
open_agent_log(server_rec * s,pool * p)105 static void open_agent_log(server_rec *s, pool *p)
106 {
107 agent_log_state *cls = ap_get_module_config(s->module_config,
108 &agent_log_module);
109
110 char *fname = ap_server_root_relative(p, cls->fname);
111
112 if (cls->agent_fd > 0)
113 return; /* virtual log shared w/main server */
114
115 if (*cls->fname == '|') {
116 piped_log *pl;
117
118 pl = ap_open_piped_log(p, cls->fname + 1);
119 if (pl == NULL) {
120 ap_log_error(APLOG_MARK, APLOG_ERR, s,
121 "couldn't spawn agent log pipe");
122 exit(1);
123 }
124 cls->agent_fd = ap_piped_log_write_fd(pl);
125 }
126 else if (*cls->fname != '\0') {
127 if (ap_server_chroot_desired())
128 cls->agent_fd = fdcache_open(fname, xfer_flags, xfer_mode);
129 else
130 cls->agent_fd = ap_popenf_ex(p, fname, xfer_flags, xfer_mode, 1);
131
132 if (cls->agent_fd < 0) {
133 ap_log_error(APLOG_MARK, APLOG_ERR, s,
134 "could not open agent log file %s.", fname);
135 exit(1);
136 }
137 }
138 }
139
init_agent_log(server_rec * s,pool * p)140 static void init_agent_log(server_rec *s, pool *p)
141 {
142 for (; s; s = s->next)
143 open_agent_log(s, p);
144 }
145
agent_log_transaction(request_rec * orig)146 static int agent_log_transaction(request_rec *orig)
147 {
148 agent_log_state *cls = ap_get_module_config(orig->server->module_config,
149 &agent_log_module);
150
151 char str[HUGE_STRING_LEN];
152 const char *agent;
153 request_rec *r;
154
155 if (cls->agent_fd < 0)
156 return OK;
157
158 for (r = orig; r->next; r = r->next)
159 continue;
160 if (*cls->fname == '\0') /* Don't log agent */
161 return DECLINED;
162
163 agent = ap_table_get(orig->headers_in, "User-Agent");
164 if (agent != NULL) {
165 snprintf(str, sizeof(str), "%s\n", agent);
166 write(cls->agent_fd, str, strlen(str));
167 }
168
169 return OK;
170 }
171
172 module agent_log_module =
173 {
174 STANDARD_MODULE_STUFF,
175 init_agent_log, /* initializer */
176 NULL, /* create per-dir config */
177 NULL, /* merge per-dir config */
178 make_agent_log_state, /* server config */
179 NULL, /* merge server config */
180 agent_log_cmds, /* command table */
181 NULL, /* handlers */
182 NULL, /* filename translation */
183 NULL, /* check_user_id */
184 NULL, /* check auth */
185 NULL, /* check access */
186 NULL, /* type_checker */
187 NULL, /* fixups */
188 agent_log_transaction, /* logger */
189 NULL, /* header parser */
190 NULL, /* child_init */
191 NULL, /* child_exit */
192 NULL /* post read-request */
193 };
194