| 1 | /* |
| 2 | * This file is part of DisOrder. |
| 3 | * Copyright (C) 2004, 2005, 2006 Richard Kettlewell |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, but |
| 11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
| 18 | * USA |
| 19 | */ |
| 20 | |
| 21 | #define NO_MEMORY_ALLOCATION |
| 22 | /* because the memory allocation functions report errors */ |
| 23 | |
| 24 | #include <config.h> |
| 25 | |
| 26 | #include <stdio.h> |
| 27 | #include <stdlib.h> |
| 28 | #include <string.h> |
| 29 | #include <errno.h> |
| 30 | #include <syslog.h> |
| 31 | #include <sys/time.h> |
| 32 | |
| 33 | #include "log.h" |
| 34 | #include "disorder.h" |
| 35 | #include "printf.h" |
| 36 | |
| 37 | struct log_output { |
| 38 | void (*fn)(int pri, const char *msg, void *user); |
| 39 | void *user; |
| 40 | }; |
| 41 | |
| 42 | void (*exitfn)(int) attribute((noreturn)) = exit; |
| 43 | int debugging; |
| 44 | const char *progname; |
| 45 | const char *debug_filename; |
| 46 | int debug_lineno; |
| 47 | struct log_output *log_default = &log_stderr; |
| 48 | |
| 49 | static const char *debug_only; |
| 50 | |
| 51 | /* we might be receiving things in any old encoding, or binary rubbish in no |
| 52 | * encoding at all, so escape anything we don't like the look of */ |
| 53 | static void format(char buffer[], size_t bufsize, const char *fmt, va_list ap) { |
| 54 | char t[1024]; |
| 55 | const char *p; |
| 56 | int ch; |
| 57 | size_t n = 0; |
| 58 | |
| 59 | if(byte_vsnprintf(t, sizeof t, fmt, ap) < 0) |
| 60 | strcpy(t, "[byte_vsnprintf failed]"); |
| 61 | p = t; |
| 62 | while((ch = (unsigned char)*p++)) { |
| 63 | if(ch >= ' ' && ch <= 126) { |
| 64 | if(n < bufsize) buffer[n++] = ch; |
| 65 | } else { |
| 66 | if(n < bufsize) buffer[n++] = '\\'; |
| 67 | if(n < bufsize) buffer[n++] = '0' + ((ch >> 6) & 7); |
| 68 | if(n < bufsize) buffer[n++] = '0' + ((ch >> 3) & 7); |
| 69 | if(n < bufsize) buffer[n++] = '0' + ((ch >> 0) & 7); |
| 70 | } |
| 71 | } |
| 72 | if(n >= bufsize) |
| 73 | n = bufsize - 1; |
| 74 | buffer[n] = 0; |
| 75 | } |
| 76 | |
| 77 | /* log to a file */ |
| 78 | static void logfp(int pri, const char *msg, void *user) { |
| 79 | struct timeval tv; |
| 80 | FILE *fp = user ? user : stderr; |
| 81 | /* ...because stderr is not a constant so we can't initialize log_stderr |
| 82 | * sanely */ |
| 83 | const char *p; |
| 84 | |
| 85 | if(progname) |
| 86 | fprintf(fp, "%s: ", progname); |
| 87 | if(pri <= LOG_ERR) |
| 88 | fputs("ERROR: ", fp); |
| 89 | else if(pri < LOG_DEBUG) |
| 90 | fputs("INFO: ", fp); |
| 91 | else { |
| 92 | if(!debug_only) { |
| 93 | if(!(debug_only = getenv("DISORDER_DEBUG_ONLY"))) |
| 94 | debug_only = ""; |
| 95 | } |
| 96 | gettimeofday(&tv, 0); |
| 97 | p = debug_filename; |
| 98 | while(!strncmp(p, "../", 3)) p += 3; |
| 99 | if(*debug_only && strcmp(p, debug_only)) |
| 100 | return; |
| 101 | fprintf(fp, "%llu.%06lu: %s:%d: ", |
| 102 | (unsigned long long)tv.tv_sec, (unsigned long)tv.tv_usec, |
| 103 | p, debug_lineno); |
| 104 | } |
| 105 | fputs(msg, fp); |
| 106 | fputc('\n', fp); |
| 107 | } |
| 108 | |
| 109 | /* log to syslog */ |
| 110 | static void logsyslog(int pri, const char *msg, |
| 111 | void attribute((unused)) *user) { |
| 112 | if(pri < LOG_DEBUG) |
| 113 | syslog(pri, "%s", msg); |
| 114 | else |
| 115 | syslog(pri, "%s:%d: %s", debug_filename, debug_lineno, msg); |
| 116 | } |
| 117 | |
| 118 | struct log_output log_stderr = { logfp, 0 }; |
| 119 | struct log_output log_syslog = { logsyslog, 0 }; |
| 120 | |
| 121 | /* log to all log outputs */ |
| 122 | static void vlogger(int pri, const char *fmt, va_list ap) { |
| 123 | char buffer[1024]; |
| 124 | |
| 125 | format(buffer, sizeof buffer, fmt, ap); |
| 126 | log_default->fn(pri, buffer, log_default->user); |
| 127 | } |
| 128 | |
| 129 | /* wrapper for vlogger */ |
| 130 | static void logger(int pri, const char *fmt, ...) { |
| 131 | va_list ap; |
| 132 | |
| 133 | va_start(ap, fmt); |
| 134 | vlogger(pri, fmt, ap); |
| 135 | va_end(ap); |
| 136 | } |
| 137 | |
| 138 | /* internals of fatal/error/info */ |
| 139 | void elog(int pri, int errno_value, const char *fmt, va_list ap) { |
| 140 | char buffer[1024]; |
| 141 | |
| 142 | if(errno_value == 0) |
| 143 | vlogger(pri, fmt, ap); |
| 144 | else { |
| 145 | memset(buffer, 0, sizeof buffer); |
| 146 | byte_vsnprintf(buffer, sizeof buffer, fmt, ap); |
| 147 | buffer[sizeof buffer - 1] = 0; |
| 148 | logger(pri, "%s: %s", buffer, strerror(errno_value)); |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | #define disorder_fatal fatal |
| 153 | #define disorder_error error |
| 154 | #define disorder_info info |
| 155 | |
| 156 | /* shared implementation of vararg functions */ |
| 157 | #include "log-impl.h" |
| 158 | |
| 159 | void debug(const char *msg, ...) { |
| 160 | va_list ap; |
| 161 | |
| 162 | va_start(ap, msg); |
| 163 | vlogger(LOG_DEBUG, msg, ap); |
| 164 | va_end(ap); |
| 165 | } |
| 166 | |
| 167 | void set_progname(char **argv) { |
| 168 | if((progname = strrchr(argv[0], '/'))) |
| 169 | ++progname; |
| 170 | else |
| 171 | progname = argv[0]; |
| 172 | } |
| 173 | |
| 174 | /* |
| 175 | Local Variables: |
| 176 | c-basic-offset:2 |
| 177 | comment-column:40 |
| 178 | End: |
| 179 | */ |