src/libloc.c

   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
  17 #include <arpa/inet.h>
  18 #include <netinet/in.h>
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <stddef.h>
  22 #include <stdarg.h>
  23 #include <unistd.h>
  24 #include <string.h>
  25 #include <ctype.h>
  26
  27 #include <libloc/libloc.h>
  28 #include <libloc/compat.h>
  29 #include <libloc/private.h>
  30
  31 struct loc_ctx {
  32         int refcount;
  33
  34         // Logging
  35         struct loc_ctx_logging {
  36                 int priority;
  37
  38                 // Callback
  39                 loc_log_callback callback;
  40                 void* data;
  41         } log;
  42 };
  43
  44 void loc_log(struct loc_ctx* ctx,
  45                 int priority, const char* file, int line, const char* fn,
  46                 const char* format, ...) {
  47         va_list args;
  48
  49         va_start(args, format);
  50         ctx->log.callback(ctx, ctx->log.data, priority, file, line, fn, format, args);
  51         va_end(args);
  52 }
  53
  54 static void log_stderr(struct loc_ctx* ctx, void* data,
  55                 int priority, const char* file, int line, const char* fn,
  56                 const char* format, va_list args) {
  57         fprintf(stderr, "libloc: %s: ", fn);
  58         vfprintf(stderr, format, args);
  59 }
  60
  61 static int log_priority(const char* priority) {
  62         char *endptr;
  63
  64         int prio = strtol(priority, &endptr, 10);
  65
  66         if (endptr[0] == '\0' || isspace(endptr[0]))
  67                 return prio;
  68
  69         if (strncmp(priority, "err", 3) == 0)
  70                 return LOG_ERR;
  71
  72         if (strncmp(priority, "info", 4) == 0)
  73                 return LOG_INFO;
  74
  75         if (strncmp(priority, "debug", 5) == 0)
  76                 return LOG_DEBUG;
  77
  78         return 0;
  79 }
  80
  81 LOC_EXPORT int loc_new(struct loc_ctx** ctx) {
  82         struct loc_ctx* c = calloc(1, sizeof(*c));
  83         if (!c)
  84                 return 1;
  85
  86         c->refcount = 1;
  87         c->log.callback = log_stderr;
  88         c->log.priority = LOG_ERR;
  89
  90         const char* env = secure_getenv("LOC_LOG");
  91         if (env)
  92                 loc_set_log_priority(c, log_priority(env));
  93
  94         INFO(c, "ctx %p created\n", c);
  95         DEBUG(c, "log_priority=%d\n", c->log.priority);
  96         *ctx = c;
  97
  98         return 0;
  99 }
 100
 101 LOC_EXPORT struct loc_ctx* loc_ref(struct loc_ctx* ctx) {
 102         if (!ctx)
 103                 return NULL;
 104
 105         ctx->refcount++;
 106
 107         return ctx;
 108 }
 109
 110 LOC_EXPORT struct loc_ctx* loc_unref(struct loc_ctx* ctx) {
 111         if (--ctx->refcount > 0)
 112                 return NULL;
 113
 114         INFO(ctx, "context %p released\n", ctx);
 115         free(ctx);
 116
 117         return NULL;
 118 }
 119
 120 LOC_EXPORT void loc_set_log_callback(struct loc_ctx* ctx, loc_log_callback callback, void* data) {
 121         ctx->log.callback = callback;
 122         ctx->log.data     = data;
 123 }
 124
 125 LOC_EXPORT void loc_set_log_fn(struct loc_ctx* ctx,
 126                 void (*log_fn)(struct loc_ctx* ctx, int priority, const char* file,
 127                 int line, const char* fn, const char* format, va_list args)) {
 128         //ctx->log_fn = log_fn;
 129         INFO(ctx, "custom logging function %p registered\n", log_fn);
 130 }
 131
 132 LOC_EXPORT int loc_get_log_priority(struct loc_ctx* ctx) {
 133         return ctx->log.priority;
 134 }
 135
 136 LOC_EXPORT void loc_set_log_priority(struct loc_ctx* ctx, int priority) {
 137         ctx->log.priority = priority;
 138 }