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