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46aded9a MT |
1 | /* |
2 | libloc - A library to determine the location of someone on the Internet | |
3 | ||
4 | Copyright (C) 2017 IPFire Development Team <info@ipfire.org> | |
5 | ||
6 | This library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | This library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | */ | |
16 | ||
2a30e4de MT |
17 | #include <arpa/inet.h> |
18 | #include <netinet/in.h> | |
46aded9a MT |
19 | #include <stdio.h> |
20 | #include <stdlib.h> | |
21 | #include <stddef.h> | |
22 | #include <stdarg.h> | |
23 | #include <unistd.h> | |
24 | #include <errno.h> | |
25 | #include <string.h> | |
26 | #include <ctype.h> | |
27 | ||
c12a1385 MT |
28 | #include <libloc/libloc.h> |
29 | #include <libloc/compat.h> | |
30 | #include <libloc/private.h> | |
46aded9a MT |
31 | |
32 | struct loc_ctx { | |
33 | int refcount; | |
34 | void (*log_fn)(struct loc_ctx* ctx, | |
35 | int priority, const char *file, int line, const char *fn, | |
36 | const char *format, va_list args); | |
37 | int log_priority; | |
38 | }; | |
39 | ||
40 | void loc_log(struct loc_ctx* ctx, | |
41 | int priority, const char* file, int line, const char* fn, | |
42 | const char* format, ...) { | |
43 | va_list args; | |
44 | ||
45 | va_start(args, format); | |
46 | ctx->log_fn(ctx, priority, file, line, fn, format, args); | |
47 | va_end(args); | |
48 | } | |
49 | ||
50 | static void log_stderr(struct loc_ctx* ctx, | |
51 | int priority, const char* file, int line, const char* fn, | |
52 | const char* format, va_list args) { | |
53 | fprintf(stderr, "libloc: %s: ", fn); | |
54 | vfprintf(stderr, format, args); | |
55 | } | |
56 | ||
57 | static int log_priority(const char* priority) { | |
58 | char *endptr; | |
59 | ||
60 | int prio = strtol(priority, &endptr, 10); | |
61 | ||
62 | if (endptr[0] == '\0' || isspace(endptr[0])) | |
63 | return prio; | |
64 | ||
65 | if (strncmp(priority, "err", 3) == 0) | |
66 | return LOG_ERR; | |
67 | ||
68 | if (strncmp(priority, "info", 4) == 0) | |
69 | return LOG_INFO; | |
70 | ||
71 | if (strncmp(priority, "debug", 5) == 0) | |
72 | return LOG_DEBUG; | |
73 | ||
74 | return 0; | |
75 | } | |
76 | ||
77 | LOC_EXPORT int loc_new(struct loc_ctx** ctx) { | |
78 | struct loc_ctx* c = calloc(1, sizeof(*c)); | |
79 | if (!c) | |
80 | return -ENOMEM; | |
81 | ||
82 | c->refcount = 1; | |
83 | c->log_fn = log_stderr; | |
84 | c->log_priority = LOG_ERR; | |
85 | ||
86 | const char* env = secure_getenv("LOC_LOG"); | |
87 | if (env) | |
88 | loc_set_log_priority(c, log_priority(env)); | |
89 | ||
90 | INFO(c, "ctx %p created\n", c); | |
91 | DEBUG(c, "log_priority=%d\n", c->log_priority); | |
92 | *ctx = c; | |
93 | ||
94 | return 0; | |
95 | } | |
96 | ||
97 | LOC_EXPORT struct loc_ctx* loc_ref(struct loc_ctx* ctx) { | |
98 | if (!ctx) | |
99 | return NULL; | |
100 | ||
101 | ctx->refcount++; | |
102 | ||
103 | return ctx; | |
104 | } | |
105 | ||
106 | LOC_EXPORT struct loc_ctx* loc_unref(struct loc_ctx* ctx) { | |
107 | if (!ctx) | |
108 | return NULL; | |
109 | ||
110 | if (--ctx->refcount > 0) | |
111 | return NULL; | |
112 | ||
113 | INFO(ctx, "context %p released\n", ctx); | |
114 | free(ctx); | |
115 | ||
116 | return NULL; | |
117 | } | |
118 | ||
119 | LOC_EXPORT void loc_set_log_fn(struct loc_ctx* ctx, | |
120 | void (*log_fn)(struct loc_ctx* ctx, int priority, const char* file, | |
121 | int line, const char* fn, const char* format, va_list args)) { | |
122 | ctx->log_fn = log_fn; | |
123 | INFO(ctx, "custom logging function %p registered\n", log_fn); | |
124 | } | |
125 | ||
126 | LOC_EXPORT int loc_get_log_priority(struct loc_ctx* ctx) { | |
127 | return ctx->log_priority; | |
128 | } | |
129 | ||
130 | LOC_EXPORT void loc_set_log_priority(struct loc_ctx* ctx, int priority) { | |
131 | ctx->log_priority = priority; | |
132 | } |