forked from lammertb/libhttp
-
Notifications
You must be signed in to change notification settings - Fork 1
/
httplib_cry.c
117 lines (95 loc) · 4.19 KB
/
httplib_cry.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
/*
* Copyright (c) 2016 Lammert Bies
* Copyright (c) 2013-2016 the Civetweb developers
* Copyright (c) 2004-2013 Sergey Lyubka
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "httplib_main.h"
#include "httplib_ssl.h"
/*
* void httplib_cry( enum lh_dbg_t debug_level, struct lh_ctx_t *ctx, const struct lh_con_t *conn, const char *fmt, ... );
*
* The function httplib_cry() prints a formatted error message to the opened
* error log stream. It first tries to use a user supplied error handler. If
* that doesn't work, the alternative is to write to an error log file.
*/
void httplib_cry( enum lh_dbg_t debug_level, struct lh_ctx_t *ctx, const struct lh_con_t *conn, const char *fmt, ... ) {
char buf[MG_BUF_LEN];
char src_addr[IP_ADDR_STR_LEN];
va_list ap;
struct file fi;
time_t timestamp;
/*
* Check if we have a context. Without a context there is no callback
* and also other important information like the path to the error file
* is missing. No need to continue if that information cannot be
* retrieved.
*/
if ( ctx == NULL ) return;
/*
* Check if the message is severe enough to display. This is controlled
* with a context specific debug level.
*/
if ( debug_level > ctx->debug_level ) return;
/*
* Gather all the information from the parameters of this function and
* create a NULL terminated string buffer with the error message.
*/
va_start( ap, fmt );
vsnprintf_impl( buf, sizeof(buf), fmt, ap );
va_end( ap );
buf[sizeof(buf)-1] = 0;
/*
* Let's first try to use the user's custom error handler callback. If
* that succeeds, there is no need for us to do our own error
* processing.
*/
if ( ctx->callbacks.log_message != NULL && ctx->callbacks.log_message( ctx, conn, buf ) != 0 ) return;
/*
* We now try to open the error log file. If this succeeds the error is
* appended to the file. On failure there is no way to log the message
* without disrupting the user's flow of control so we just return and
* logging anything. This is IMHO better than printing to stderr which
* may not even be available on all platforms (Windows etc).
*/
if ( ctx->error_log_file == NULL ) return;
if ( ! XX_httplib_fopen( ctx, conn, ctx->error_log_file, "a+", &fi ) ) return;
/*
* We now have an open FILE stream pointer in fi.fp and can dump the
* message in that file. Note though, that some information might not
* be available for logging if the message has no connection, so some
* information is skipped if the 'conn' parameter is NULL.
*
* Just to be sure that no other process is writing to the same file,
* we use locking around this operation.
*/
flockfile( fi.fp );
timestamp = time( NULL );
if ( conn != NULL ) XX_httplib_sockaddr_to_string( src_addr, sizeof(src_addr), &conn->client.rsa );
fprintf( fi.fp, "[%010lu] [error] [client %s] ", (unsigned long)timestamp, src_addr );
if ( conn != NULL && conn->request_info.request_method != NULL ) {
fprintf( fi.fp, "%s %s: ", conn->request_info.request_method, conn->request_info.request_uri );
}
fprintf( fi.fp, "%s", buf );
fputc( '\n', fi.fp );
fflush( fi.fp );
funlockfile( fi.fp );
XX_httplib_fclose( &fi );
} /* httplib_cry */