1/*** 2 This file is part of avahi. 3 4 avahi is free software; you can redistribute it and/or modify it 5 under the terms of the GNU Lesser General Public License as 6 published by the Free Software Foundation; either version 2.1 of the 7 License, or (at your option) any later version. 8 9 avahi is distributed in the hope that it will be useful, but WITHOUT 10 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 11 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General 12 Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with avahi; if not, write to the Free Software 16 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 17 USA. 18***/ 19 20#ifdef HAVE_CONFIG_H 21#include <config.h> 22#endif 23 24#include <pthread.h> 25#include <unistd.h> 26#include <limits.h> 27#include <stdio.h> 28#include <string.h> 29#include <stdlib.h> 30#include <assert.h> 31#include <stdarg.h> 32#include <syslog.h> 33 34#include "warn.h" 35 36#ifndef COMPAT_LAYER 37#define COMPAT_LAYER "Apple Bonjour" 38#endif 39 40#ifndef CGI_SUBSYSTEM 41#define CGI_SUBSYSTEM "libdns_sd" 42#endif 43 44static pthread_mutex_t linkage_mutex = PTHREAD_MUTEX_INITIALIZER; 45static int linkage_warning = 0; 46 47const char *avahi_exe_name(void) { 48#ifdef HAVE_GETPROGNAME 49 return getprogname(); 50#elif defined(__linux__) 51 static char exe_name[1024] = ""; 52 static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; 53 54 /* Yes, I know, this is not portable. But who cares? It's for 55 * cosmetics only, anyway. */ 56 57 pthread_mutex_lock(&mutex); 58 59 if (exe_name[0] == 0) { 60 int k; 61 62 if ((k = readlink("/proc/self/exe", exe_name, sizeof(exe_name)-1)) < 0) 63 snprintf(exe_name, sizeof(exe_name), "(unknown)"); 64 else { 65 char *slash; 66 67 assert((size_t) k <= sizeof(exe_name)-1); 68 exe_name[k] = 0; 69 70 if ((slash = strrchr(exe_name, '/'))) 71 memmove(exe_name, slash+1, strlen(slash)+1); 72 } 73 } 74 75 pthread_mutex_unlock(&mutex); 76 77 return exe_name; 78#else 79#ifdef __GNUC__ 80#warning "avahi_exe_name() needs to be implemented for your operating system" 81#endif 82 return "(unknown)"; 83#endif 84} 85 86void avahi_warn(const char *fmt, ...) { 87 char msg[512] = "*** WARNING *** "; 88 va_list ap; 89 size_t n; 90 91 assert(fmt); 92 93 va_start(ap, fmt); 94 n = strlen(msg); 95 vsnprintf(msg + n, sizeof(msg) - n, fmt, ap); 96 va_end(ap); 97 98 fprintf(stderr, "%s\n", msg); 99 100 openlog(avahi_exe_name(), LOG_PID, LOG_USER); 101 syslog(LOG_WARNING, "%s", msg); 102 closelog(); 103} 104 105void avahi_warn_linkage(void) { 106 int w; 107 108 pthread_mutex_lock(&linkage_mutex); 109 w = linkage_warning; 110 linkage_warning = 1; 111 pthread_mutex_unlock(&linkage_mutex); 112 113 if (!w && !getenv("AVAHI_COMPAT_NOWARN")) { 114 avahi_warn("The program '%s' uses the "COMPAT_LAYER" compatibility layer of Avahi.", avahi_exe_name()); 115 avahi_warn("Please fix your application to use the native API of Avahi!"); 116 avahi_warn("For more information see <http://0pointer.de/avahi-compat?s="CGI_SUBSYSTEM"&e=%s>", avahi_exe_name()); 117 } 118} 119 120void avahi_warn_unsupported(const char *function) { 121 avahi_warn("The program '%s' called '%s()' which is not supported (or only supported partially) in the "COMPAT_LAYER" compatibility layer of Avahi.", avahi_exe_name(), function); 122 avahi_warn("Please fix your application to use the native API of Avahi!"); 123 avahi_warn("For more information see <http://0pointer.de/avahi-compat?s="CGI_SUBSYSTEM"&e=%s&f=%s>", avahi_exe_name(), function); 124} 125