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/*
commmon.c - Common routines for the tsocks package
*/
#include <config.h>
#include <stdio.h>
#include <netdb.h>
#include <common.h>
#include <stdarg.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <arpa/inet.h>
#include <netinet/in.h>
/* Globals */
int loglevel = MSGERR; /* The default logging level is to only log
error messages */
char logfilename[256]; /* Name of file to which log messages should
be redirected */
FILE *logfile = NULL; /* File to which messages should be logged */
unsigned int resolve_ip(char *host, int showmsg, int allownames) {
struct hostent *new;
unsigned int hostaddr;
struct in_addr *ip;
if ((hostaddr = inet_addr(host)) == (unsigned int) -1) {
/* We couldn't convert it as a numerical ip so */
/* try it as a dns name */
if (allownames) {
#ifdef HAVE_GETHOSTBYNAME
if ((new = gethostbyname(host)) == (struct hostent *) 0) {
#endif
return(-1);
#ifdef HAVE_GETHOSTBYNAME
} else {
ip = ((struct in_addr *) * new->h_addr_list);
hostaddr = ip -> s_addr;
if (showmsg)
printf("Connecting to %s...\n", inet_ntoa(*ip));
}
#endif
} else
return(-1);
}
return (hostaddr);
}
/* Set logging options, the options are as follows: */
/* level - This sets the logging threshold, messages with */
/* a higher level (i.e lower importance) will not be */
/* output. For example, if the threshold is set to */
/* MSGWARN a call to log a message of level MSGDEBUG */
/* would be ignored. This can be set to -1 to disable */
/* messages entirely */
/* filename - This is a filename to which the messages should */
/* be logged instead of to standard error */
void set_log_options(int level, char *filename) {
loglevel = level;
if (loglevel < MSGERR)
loglevel = MSGNONE;
if (filename) {
strncpy(logfilename, filename, sizeof(logfilename));
logfilename[sizeof(logfilename) - 1] = '\0';
}
}
void show_msg(int level, char *fmt, ...) {
va_list ap;
int saveerr;
extern char *progname;
if ((loglevel == MSGNONE) || (level > loglevel))
return;
if (!logfile) {
if (logfilename[0]) {
logfile = fopen(logfilename, "a");
if (logfile == NULL) {
logfile = stderr;
show_msg(MSGERR, "Could not open log file, %s, %s\n",
logfilename, strerror(errno));
}
} else
logfile = stderr;
}
fputs(progname, logfile);
fputs(": ", logfile);
va_start(ap, fmt);
/* Save errno */
saveerr = errno;
vfprintf(logfile, fmt, ap);
fflush(logfile);
errno = saveerr;
va_end(ap);
}
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