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      1 /*
      2  * dhcpcd - DHCP client daemon
      3  * Copyright 2006-2008 Roy Marples <roy (at) marples.name>
      4  * All rights reserved
      5 
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     25  * SUCH DAMAGE.
     26  */
     27 
     28 #include <ctype.h>
     29 #include <stdarg.h>
     30 #include <stdio.h>
     31 #include <stdlib.h>
     32 #include <string.h>
     33 #include <syslog.h>
     34 
     35 #include "common.h"
     36 #include "logger.h"
     37 
     38 #ifdef ANDROID
     39 #include <android/log.h>
     40 #endif
     41 
     42 static int loglevel = LOG_INFO;
     43 static char logprefix[12] = {0};
     44 
     45 void
     46 setloglevel(int level)
     47 {
     48 	loglevel = level;
     49 }
     50 
     51 void
     52 setlogprefix(const char *prefix)
     53 {
     54 	strlcpy(logprefix, prefix, sizeof(logprefix));
     55 }
     56 
     57 void
     58 logger(int level, const char *fmt, ...)
     59 {
     60 	va_list p, p2;
     61 	FILE *f = stderr;
     62 	size_t len, fmt2len;
     63 	char *fmt2, *pf;
     64 
     65 	va_start(p, fmt);
     66 #ifdef ANDROID
     67 	if (level <= loglevel) {
     68 		if (level <= LOG_ERR) {
     69 			level = ANDROID_LOG_ERROR;
     70 		} else {
     71 			level = ANDROID_LOG_DEBUG;
     72 		}
     73 		__android_log_vprint(level, "dhcpcd", fmt, p);
     74 	}
     75 #else
     76 	va_copy(p2, p);
     77 
     78 	if (level <= LOG_ERR || level <= loglevel) {
     79 		fprintf(f, "%s", logprefix);
     80 		vfprintf(f, fmt, p);
     81 		fputc('\n', f);
     82 	}
     83 
     84 	if (level < LOG_DEBUG || level <= loglevel) {
     85 		len = strlen(logprefix);
     86 		fmt2len = strlen(fmt) + len + 1;
     87 		fmt2 = pf = malloc(sizeof(char) * fmt2len);
     88 		if (fmt2) {
     89 			strlcpy(pf, logprefix, fmt2len);
     90 			pf += len;
     91 			strlcpy(pf, fmt, fmt2len - len);
     92 			vsyslog(level, fmt2, p2);
     93 			free(fmt2);
     94 		} else {
     95 			vsyslog(level, fmt, p2);
     96 			syslog(LOG_ERR, "logger: memory exhausted");
     97 			exit(EXIT_FAILURE);
     98 		}
     99 	}
    100 
    101 	va_end(p2);
    102 #endif
    103 	va_end(p);
    104 }
    105