1 /*
2 * libwebsockets - small server side websockets and web server implementation
3 *
4 * Copyright (C) 2010 - 2019 Andy Green <andy@warmcat.com>
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to
8 * deal in the Software without restriction, including without limitation the
9 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10 * sell copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
22 * IN THE SOFTWARE.
23 */
24
25 #include "private-lib-core.h"
26
27 /*
28 * Produce Apache-compatible log string for wsi, like this:
29 *
30 * 2.31.234.19 - - [27/Mar/2016:03:22:44 +0800]
31 * "GET /aep-screen.png HTTP/1.1"
32 * 200 152987 "https://libwebsockets.org/index.html"
33 * "Mozilla/5.0 (Macint... Chrome/49.0.2623.87 Safari/537.36"
34 *
35 */
36
37 extern const char * const method_names[];
38
39 static const char * const hver[] = {
40 "HTTP/1.0", "HTTP/1.1", "HTTP/2"
41 };
42
43 void
lws_prepare_access_log_info(struct lws * wsi,char * uri_ptr,int uri_len,int meth)44 lws_prepare_access_log_info(struct lws *wsi, char *uri_ptr, int uri_len, int meth)
45 {
46 char da[64], uri[256];
47 time_t t = time(NULL);
48 struct lws *nwsi;
49 const char *me;
50 int l = 256, m;
51 struct tm *tmp;
52
53 if (!wsi->vhost)
54 return;
55
56 /* only worry about preparing it if we store it */
57 if (wsi->vhost->log_fd == (int)LWS_INVALID_FILE)
58 return;
59
60 if (wsi->access_log_pending)
61 lws_access_log(wsi);
62
63 wsi->http.access_log.header_log = lws_malloc(l, "access log");
64 if (!wsi->http.access_log.header_log)
65 return;
66
67 tmp = localtime(&t);
68 if (tmp)
69 strftime(da, sizeof(da), "%d/%b/%Y:%H:%M:%S %z", tmp);
70 else
71 strcpy(da, "01/Jan/1970:00:00:00 +0000");
72
73 if (wsi->mux_substream)
74 me = lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP_COLON_METHOD);
75 else
76 me = method_names[meth];
77 if (!me)
78 me = "(null)";
79
80 m = uri_len;
81 if (m > (int)sizeof(uri) - 1)
82 m = sizeof(uri) - 1;
83
84 strncpy(uri, uri_ptr, m);
85 uri[m] = '\0';
86
87 nwsi = lws_get_network_wsi(wsi);
88
89 lws_snprintf(wsi->http.access_log.header_log, l,
90 "%s - - [%s] \"%s %s %s\"",
91 nwsi->simple_ip[0] ? nwsi->simple_ip : "unknown", da, me, uri,
92 hver[wsi->http.request_version]);
93
94 //lwsl_notice("%s\n", wsi->http.access_log.header_log);
95
96 l = lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_USER_AGENT);
97 if (l) {
98 wsi->http.access_log.user_agent =
99 lws_malloc(l + 5, "access log");
100 if (!wsi->http.access_log.user_agent) {
101 lwsl_err("OOM getting user agent\n");
102 lws_free_set_NULL(wsi->http.access_log.header_log);
103 return;
104 }
105 wsi->http.access_log.user_agent[0] = '\0';
106
107 if (lws_hdr_copy(wsi, wsi->http.access_log.user_agent, l + 4,
108 WSI_TOKEN_HTTP_USER_AGENT) >= 0)
109 for (m = 0; m < l; m++)
110 if (wsi->http.access_log.user_agent[m] == '\"')
111 wsi->http.access_log.user_agent[m] = '\'';
112 }
113 l = lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_REFERER);
114 if (l) {
115 wsi->http.access_log.referrer = lws_malloc(l + 5, "referrer");
116 if (!wsi->http.access_log.referrer) {
117 lwsl_err("OOM getting referrer\n");
118 lws_free_set_NULL(wsi->http.access_log.user_agent);
119 lws_free_set_NULL(wsi->http.access_log.header_log);
120 return;
121 }
122 wsi->http.access_log.referrer[0] = '\0';
123 if (lws_hdr_copy(wsi, wsi->http.access_log.referrer,
124 l + 4, WSI_TOKEN_HTTP_REFERER) >= 0)
125
126 for (m = 0; m < l; m++)
127 if (wsi->http.access_log.referrer[m] == '\"')
128 wsi->http.access_log.referrer[m] = '\'';
129 }
130 wsi->access_log_pending = 1;
131 }
132
133
134 int
lws_access_log(struct lws * wsi)135 lws_access_log(struct lws *wsi)
136 {
137 char *p = wsi->http.access_log.user_agent, ass[512],
138 *p1 = wsi->http.access_log.referrer;
139 int l;
140
141 if (!wsi->vhost)
142 return 0;
143
144 if (wsi->vhost->log_fd == (int)LWS_INVALID_FILE)
145 return 0;
146
147 if (!wsi->access_log_pending)
148 return 0;
149
150 if (!wsi->http.access_log.header_log)
151 return 0;
152
153 if (!p)
154 p = "";
155
156 if (!p1)
157 p1 = "";
158
159 /*
160 * We do this in two parts to restrict an oversize referrer such that
161 * we will always have space left to append an empty useragent, while
162 * maintaining the structure of the log text
163 */
164 l = lws_snprintf(ass, sizeof(ass) - 7, "%s %d %lu \"%s",
165 wsi->http.access_log.header_log,
166 wsi->http.access_log.response,
167 wsi->http.access_log.sent, p1);
168 if (strlen(p) > sizeof(ass) - 6 - l) {
169 p[sizeof(ass) - 6 - l] = '\0';
170 l--;
171 }
172 l += lws_snprintf(ass + l, sizeof(ass) - 1 - l, "\" \"%s\"\n", p);
173
174 ass[sizeof(ass) - 1] = '\0';
175
176 if (write(wsi->vhost->log_fd, ass, l) != l)
177 lwsl_err("Failed to write log\n");
178
179 if (wsi->http.access_log.header_log) {
180 lws_free(wsi->http.access_log.header_log);
181 wsi->http.access_log.header_log = NULL;
182 }
183 if (wsi->http.access_log.user_agent) {
184 lws_free(wsi->http.access_log.user_agent);
185 wsi->http.access_log.user_agent = NULL;
186 }
187 if (wsi->http.access_log.referrer) {
188 lws_free(wsi->http.access_log.referrer);
189 wsi->http.access_log.referrer = NULL;
190 }
191 wsi->access_log_pending = 0;
192
193 return 0;
194 }
195
196