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-rw-r--r--utils/bitlbeed.c510
1 files changed, 234 insertions, 276 deletions
diff --git a/utils/bitlbeed.c b/utils/bitlbeed.c
index 82bd0879..c4fa8ad0 100644
--- a/utils/bitlbeed.c
+++ b/utils/bitlbeed.c
@@ -12,9 +12,9 @@
* Modified by M. Dennis, 20040627 *
\****************************************************************/
-/*
+/*
ChangeLog:
-
+
2004-06-27: Added support for AF_LOCAL (UNIX domain) sockets
Renamed log to do_log to fix conflict warning
Changed protocol to 0 (6 is not supported?)
@@ -49,407 +49,365 @@
#include <netinet/in.h>
#include <arpa/inet.h>
-typedef struct settings
-{
+typedef struct settings {
char local;
char debug;
char *interface;
signed int port;
-
+
unsigned char max_conn;
int seconds;
-
+
int rate_seconds;
int rate_times;
int rate_ignore;
-
+
char **call;
} settings_t;
-typedef struct ipstats
-{
+typedef struct ipstats {
unsigned int ip;
-
+
time_t rate_start;
int rate_times;
time_t rate_ignore;
-
+
struct ipstats *next;
} ipstats_t;
FILE *logfile;
ipstats_t *ipstats;
-settings_t *set_load( int argc, char *argv[] );
-void do_log( char *fmt, ... );
-ipstats_t *ip_get( char *ip_txt );
+settings_t *set_load(int argc, char *argv[]);
+void do_log(char *fmt, ...);
+ipstats_t *ip_get(char *ip_txt);
-int main( int argc, char *argv[] )
+int main(int argc, char *argv[])
{
const int rebind_on = 1;
settings_t *set;
-
+
int serv_fd, serv_len;
struct sockaddr_in serv_addr;
struct sockaddr_un local_addr;
-
+
pid_t st;
-
- if( !( set = set_load( argc, argv ) ) )
- return( 1 );
-
- if( !logfile )
- if( !( logfile = fopen( "/dev/null", "w" ) ) )
- {
- perror( "fopen" );
- return( 1 );
+
+ if (!(set = set_load(argc, argv))) {
+ return(1);
+ }
+
+ if (!logfile) {
+ if (!(logfile = fopen("/dev/null", "w"))) {
+ perror("fopen");
+ return(1);
}
-
- fcntl( fileno( logfile ), F_SETFD, FD_CLOEXEC );
-
- if( set->local )
- serv_fd = socket( PF_LOCAL, SOCK_STREAM, 0 );
- else
- serv_fd = socket( PF_INET, SOCK_STREAM, 0 );
- if( serv_fd < 0 )
- {
- perror( "socket" );
- return( 1 );
}
- setsockopt( serv_fd, SOL_SOCKET, SO_REUSEADDR, &rebind_on, sizeof( rebind_on ) );
- fcntl( serv_fd, F_SETFD, FD_CLOEXEC );
+
+ fcntl(fileno(logfile), F_SETFD, FD_CLOEXEC);
+
+ if (set->local) {
+ serv_fd = socket(PF_LOCAL, SOCK_STREAM, 0);
+ } else {
+ serv_fd = socket(PF_INET, SOCK_STREAM, 0);
+ }
+ if (serv_fd < 0) {
+ perror("socket");
+ return(1);
+ }
+ setsockopt(serv_fd, SOL_SOCKET, SO_REUSEADDR, &rebind_on, sizeof(rebind_on));
+ fcntl(serv_fd, F_SETFD, FD_CLOEXEC);
if (set->local) {
local_addr.sun_family = AF_LOCAL;
- strncpy( local_addr.sun_path, set->interface, sizeof( local_addr.sun_path ) - 1 );
- local_addr.sun_path[sizeof( local_addr.sun_path ) - 1] = '\0';
-
+ strncpy(local_addr.sun_path, set->interface, sizeof(local_addr.sun_path) - 1);
+ local_addr.sun_path[sizeof(local_addr.sun_path) - 1] = '\0';
+
/* warning - don't let untrusted users run this program if it
is setuid/setgid! Arbitrary file deletion risk! */
- unlink( set->interface );
- if( bind( serv_fd, (struct sockaddr *) &local_addr, SUN_LEN( &local_addr ) ) != 0 )
- {
- perror( "bind" );
- return( 1 );
+ unlink(set->interface);
+ if (bind(serv_fd, (struct sockaddr *) &local_addr, SUN_LEN(&local_addr)) != 0) {
+ perror("bind");
+ return(1);
}
- chmod( set->interface, S_IRWXO|S_IRWXG|S_IRWXU );
+ chmod(set->interface, S_IRWXO | S_IRWXG | S_IRWXU);
} else {
serv_addr.sin_family = AF_INET;
- serv_addr.sin_addr.s_addr = inet_addr( set->interface );
- serv_addr.sin_port = htons( set->port );
- serv_len = sizeof( serv_addr );
-
- if( bind( serv_fd, (struct sockaddr *) &serv_addr, serv_len ) != 0 )
- {
- perror( "bind" );
- return( 1 );
+ serv_addr.sin_addr.s_addr = inet_addr(set->interface);
+ serv_addr.sin_port = htons(set->port);
+ serv_len = sizeof(serv_addr);
+
+ if (bind(serv_fd, (struct sockaddr *) &serv_addr, serv_len) != 0) {
+ perror("bind");
+ return(1);
}
}
-
- if( listen( serv_fd, set->max_conn ) != 0 )
- {
- perror( "listen" );
- return( 1 );
+
+ if (listen(serv_fd, set->max_conn) != 0) {
+ perror("listen");
+ return(1);
}
-
- if ( ! set->debug ) {
+
+ if (!set->debug) {
st = fork();
- if( st < 0 )
- {
- perror( "fork" );
- return( 1 );
- }
- else if( st > 0 )
- {
- return( 0 );
+ if (st < 0) {
+ perror("fork");
+ return(1);
+ } else if (st > 0) {
+ return(0);
}
-
+
setsid();
- close( 0 );
- close( 1 );
- close( 2 );
+ close(0);
+ close(1);
+ close(2);
}
-
- do_log( "bitlbeed running" );
-
+
+ do_log("bitlbeed running");
+
/* The Daemon */
- while( 1 )
- {
+ while (1) {
int cli_fd, cli_len, i, st;
struct sockaddr_in cli_addr;
struct sockaddr_un cli_local;
ipstats_t *ip;
char *cli_txt;
pid_t child;
-
+
static int running = 0;
-
+
fd_set rd;
struct timeval tm;
-
+
/* accept() only returns after someone connects. To clean up old
processes (by running waitpid()) it's better to use select()
with a timeout. */
- FD_ZERO( &rd );
- FD_SET( serv_fd, &rd );
+ FD_ZERO(&rd);
+ FD_SET(serv_fd, &rd);
tm.tv_sec = SELECT_TIMEOUT;
tm.tv_usec = 0;
- if( select( serv_fd + 1, &rd, NULL, NULL, &tm ) > 0 )
- {
+ if (select(serv_fd + 1, &rd, NULL, NULL, &tm) > 0) {
if (set->local) {
- cli_len = SUN_LEN( &cli_local );
- cli_fd = accept( serv_fd, (struct sockaddr *) &cli_local, &cli_len );
+ cli_len = SUN_LEN(&cli_local);
+ cli_fd = accept(serv_fd, (struct sockaddr *) &cli_local, &cli_len);
cli_txt = "127.0.0.1";
} else {
- cli_len = sizeof( cli_addr );
- cli_fd = accept( serv_fd, (struct sockaddr *) &cli_addr, &cli_len );
- cli_txt = inet_ntoa( cli_addr.sin_addr );
+ cli_len = sizeof(cli_addr);
+ cli_fd = accept(serv_fd, (struct sockaddr *) &cli_addr, &cli_len);
+ cli_txt = inet_ntoa(cli_addr.sin_addr);
}
-
- ip = ip_get( cli_txt );
-
- if( set->rate_times == 0 || time( NULL ) > ip->rate_ignore )
- {
+
+ ip = ip_get(cli_txt);
+
+ if (set->rate_times == 0 || time(NULL) > ip->rate_ignore) {
/* We want this socket on stdout and stderr too! */
- dup( cli_fd ); dup( cli_fd );
-
- if( ( child = fork() ) == 0 )
- {
- if( set->seconds )
- {
+ dup(cli_fd); dup(cli_fd);
+
+ if ((child = fork()) == 0) {
+ if (set->seconds) {
struct rlimit li;
-
+
li.rlim_cur = (rlim_t) set->seconds;
li.rlim_max = (rlim_t) set->seconds + 1;
- setrlimit( RLIMIT_CPU, &li );
+ setrlimit(RLIMIT_CPU, &li);
}
- execv( set->call[0], set->call );
- do_log( "Error while executing %s!", set->call[0] );
- return( 1 );
+ execv(set->call[0], set->call);
+ do_log("Error while executing %s!", set->call[0]);
+ return(1);
}
-
- running ++;
- close( 0 );
- close( 1 );
- close( 2 );
-
- do_log( "Started child process for client %s (PID=%d), got %d clients now", cli_txt, child, running );
-
- if( time( NULL ) < ( ip->rate_start + set->rate_seconds ) )
- {
- ip->rate_times ++;
- if( ip->rate_times >= set->rate_times )
- {
- do_log( "Client %s crossed the limit; ignoring for the next %d seconds", cli_txt, set->rate_ignore );
- ip->rate_ignore = time( NULL ) + set->rate_ignore;
+
+ running++;
+ close(0);
+ close(1);
+ close(2);
+
+ do_log("Started child process for client %s (PID=%d), got %d clients now", cli_txt,
+ child, running);
+
+ if (time(NULL) < (ip->rate_start + set->rate_seconds)) {
+ ip->rate_times++;
+ if (ip->rate_times >= set->rate_times) {
+ do_log("Client %s crossed the limit; ignoring for the next %d seconds",
+ cli_txt, set->rate_ignore);
+ ip->rate_ignore = time(NULL) + set->rate_ignore;
ip->rate_start = 0;
}
- }
- else
- {
- ip->rate_start = time( NULL );
+ } else {
+ ip->rate_start = time(NULL);
ip->rate_times = 1;
}
- }
- else
- {
- do_log( "Ignoring connection from %s", cli_txt );
- close( cli_fd );
+ } else {
+ do_log("Ignoring connection from %s", cli_txt);
+ close(cli_fd);
}
}
-
+
/* If the max. number of connection is reached, don't accept
new connections until one expires -> Not always WNOHANG
-
+
Cleaning up child processes is a good idea anyway... :-) */
- while( ( i = waitpid( 0, &st, ( ( running < set->max_conn ) || ( set->max_conn == 0 ) ) ? WNOHANG : 0 ) ) > 0 )
- {
- running --;
- if( WIFEXITED( st ) )
- {
- do_log( "Child process (PID=%d) exited normally with status %d. %d Clients left now",
- i, WEXITSTATUS( st ), running );
- }
- else if( WIFSIGNALED( st ) )
- {
- do_log( "Child process (PID=%d) killed by signal %d. %d Clients left now",
- i, WTERMSIG( st ), running );
- }
- else
- {
+ while ((i = waitpid(0, &st, ((running < set->max_conn) || (set->max_conn == 0)) ? WNOHANG : 0)) > 0) {
+ running--;
+ if (WIFEXITED(st)) {
+ do_log("Child process (PID=%d) exited normally with status %d. %d Clients left now",
+ i, WEXITSTATUS(st), running);
+ } else if (WIFSIGNALED(st)) {
+ do_log("Child process (PID=%d) killed by signal %d. %d Clients left now",
+ i, WTERMSIG(st), running);
+ } else {
/* Should not happen AFAIK... */
- do_log( "Child process (PID=%d) stopped for unknown reason, %d clients left now",
- i, running );
+ do_log("Child process (PID=%d) stopped for unknown reason, %d clients left now",
+ i, running);
}
}
}
-
- return( 0 );
+
+ return(0);
}
-settings_t *set_load( int argc, char *argv[] )
+settings_t *set_load(int argc, char *argv[])
{
settings_t *set;
int opt, i;
-
- set = malloc( sizeof( settings_t ) );
- memset( set, 0, sizeof( settings_t ) );
- set->interface = NULL; /* will be filled in later */
+
+ set = malloc(sizeof(settings_t));
+ memset(set, 0, sizeof(settings_t));
+ set->interface = NULL; /* will be filled in later */
set->port = 6667;
set->local = 0;
set->debug = 0;
-
+
set->rate_seconds = 600;
set->rate_times = 5;
set->rate_ignore = 900;
-
- while( ( opt = getopt( argc, argv, "i:p:n:t:l:r:hud" ) ) >= 0 )
- {
- if( opt == 'i' )
- {
- set->interface = strdup( optarg );
- }
- else if( opt == 'p' )
- {
- if( ( sscanf( optarg, "%d", &i ) != 1 ) || ( i <= 0 ) || ( i > 65535 ) )
- {
- fprintf( stderr, "Invalid port number: %s\n", optarg );
- return( NULL );
+
+ while ((opt = getopt(argc, argv, "i:p:n:t:l:r:hud")) >= 0) {
+ if (opt == 'i') {
+ set->interface = strdup(optarg);
+ } else if (opt == 'p') {
+ if ((sscanf(optarg, "%d", &i) != 1) || (i <= 0) || (i > 65535)) {
+ fprintf(stderr, "Invalid port number: %s\n", optarg);
+ return(NULL);
}
set->port = i;
- }
- else if( opt == 'n' )
- {
- if( ( sscanf( optarg, "%d", &i ) != 1 ) || ( i < 0 ) )
- {
- fprintf( stderr, "Invalid number of connections: %s\n", optarg );
- return( NULL );
+ } else if (opt == 'n') {
+ if ((sscanf(optarg, "%d", &i) != 1) || (i < 0)) {
+ fprintf(stderr, "Invalid number of connections: %s\n", optarg);
+ return(NULL);
}
set->max_conn = i;
- }
- else if( opt == 't' )
- {
- if( ( sscanf( optarg, "%d", &i ) != 1 ) || ( i < 0 ) || ( i > 600 ) )
- {
- fprintf( stderr, "Invalid number of seconds: %s\n", optarg );
- return( NULL );
+ } else if (opt == 't') {
+ if ((sscanf(optarg, "%d", &i) != 1) || (i < 0) || (i > 600)) {
+ fprintf(stderr, "Invalid number of seconds: %s\n", optarg);
+ return(NULL);
}
set->seconds = i;
- }
- else if( opt == 'l' )
- {
- if( !( logfile = fopen( optarg, "a" ) ) )
- {
- perror( "fopen" );
- fprintf( stderr, "Error opening logfile, giving up.\n" );
- return( NULL );
+ } else if (opt == 'l') {
+ if (!(logfile = fopen(optarg, "a"))) {
+ perror("fopen");
+ fprintf(stderr, "Error opening logfile, giving up.\n");
+ return(NULL);
}
- setbuf( logfile, NULL );
- }
- else if( opt == 'r' )
- {
- if( sscanf( optarg, "%d,%d,%d", &set->rate_seconds, &set->rate_times, &set->rate_ignore ) != 3 )
- {
- fprintf( stderr, "Invalid argument to -r.\n" );
- return( NULL );
+ setbuf(logfile, NULL);
+ } else if (opt == 'r') {
+ if (sscanf(optarg, "%d,%d,%d", &set->rate_seconds, &set->rate_times, &set->rate_ignore) != 3) {
+ fprintf(stderr, "Invalid argument to -r.\n");
+ return(NULL);
}
- }
- else if( opt == 'u' )
+ } else if (opt == 'u') {
set->local = 1;
- else if( opt == 'd' )
+ } else if (opt == 'd') {
set->debug = 1;
- else if( opt == 'h' )
- {
- printf( "Usage: %s [-i <interface>] [-p <port>] [-n <num>] [-r x,y,z] ...\n"
- " ... <command> <args...>\n"
- "A simple inetd-like daemon to have a program listening on a TCP socket without\n"
- "needing root access to the machine\n"
- "\n"
- " -i Specify the interface (by IP address) to listen on.\n"
- " (Default: 0.0.0.0 (any interface))\n"
- " -p Port number to listen on. (Default: 6667)\n"
- " -n Maximum number of connections. (Default: 0 (unlimited))\n"
- " -t Specify the maximum number of CPU seconds per process.\n"
- " (Default: 0 (unlimited))\n"
- " -l Specify a logfile. (Default: none)\n"
- " -r Rate limiting: Ignore a host for z seconds when it connects for more\n"
- " than y times in x seconds. (Default: 600,5,900. Disable: 0,0,0)\n"
- " -u Use a local socket, by default /tmp/bitlbee (override with -i <filename>)\n"
- " -d Don't fork for listening (for debugging purposes)\n"
- " -h This information\n", argv[0] );
- return( NULL );
+ } else if (opt == 'h') {
+ printf("Usage: %s [-i <interface>] [-p <port>] [-n <num>] [-r x,y,z] ...\n"
+ " ... <command> <args...>\n"
+ "A simple inetd-like daemon to have a program listening on a TCP socket without\n"
+ "needing root access to the machine\n"
+ "\n"
+ " -i Specify the interface (by IP address) to listen on.\n"
+ " (Default: 0.0.0.0 (any interface))\n"
+ " -p Port number to listen on. (Default: 6667)\n"
+ " -n Maximum number of connections. (Default: 0 (unlimited))\n"
+ " -t Specify the maximum number of CPU seconds per process.\n"
+ " (Default: 0 (unlimited))\n"
+ " -l Specify a logfile. (Default: none)\n"
+ " -r Rate limiting: Ignore a host for z seconds when it connects for more\n"
+ " than y times in x seconds. (Default: 600,5,900. Disable: 0,0,0)\n"
+ " -u Use a local socket, by default /tmp/bitlbee (override with -i <filename>)\n"
+ " -d Don't fork for listening (for debugging purposes)\n"
+ " -h This information\n", argv[0]);
+ return(NULL);
}
}
-
- if( set->interface == NULL )
+
+ if (set->interface == NULL) {
set->interface = (set->local) ? "/tmp/bitlbee" : "0.0.0.0";
-
- if( optind == argc )
- {
- fprintf( stderr, "Missing program parameter!\n" );
- return( NULL );
}
-
+
+ if (optind == argc) {
+ fprintf(stderr, "Missing program parameter!\n");
+ return(NULL);
+ }
+
/* The remaining arguments are the executable and its arguments */
- set->call = malloc( ( argc - optind + 1 ) * sizeof( char* ) );
- memcpy( set->call, argv + optind, sizeof( char* ) * ( argc - optind ) );
- set->call[argc-optind] = NULL;
-
- return( set );
+ set->call = malloc((argc - optind + 1) * sizeof(char*));
+ memcpy(set->call, argv + optind, sizeof(char*) * (argc - optind));
+ set->call[argc - optind] = NULL;
+
+ return(set);
}
-void do_log( char *fmt, ... )
+void do_log(char *fmt, ...)
{
va_list params;
char line[MAX_LOG_LEN];
time_t tm;
int l;
-
- memset( line, 0, MAX_LOG_LEN );
-
- tm = time( NULL );
- strcpy( line, ctime( &tm ) );
- l = strlen( line );
- line[l-1] = ' ';
-
- va_start( params, fmt );
- vsnprintf( line + l, MAX_LOG_LEN - l - 2, fmt, params );
- va_end( params );
- strcat( line, "\n" );
-
- fprintf( logfile, "%s", line );
+
+ memset(line, 0, MAX_LOG_LEN);
+
+ tm = time(NULL);
+ strcpy(line, ctime(&tm));
+ l = strlen(line);
+ line[l - 1] = ' ';
+
+ va_start(params, fmt);
+ vsnprintf(line + l, MAX_LOG_LEN - l - 2, fmt, params);
+ va_end(params);
+ strcat(line, "\n");
+
+ fprintf(logfile, "%s", line);
}
-ipstats_t *ip_get( char *ip_txt )
+ipstats_t *ip_get(char *ip_txt)
{
unsigned int ip;
ipstats_t *l;
int p[4];
-
- sscanf( ip_txt, "%d.%d.%d.%d", p + 0, p + 1, p + 2, p + 3 );
- ip = ( p[0] << 24 ) | ( p[1] << 16 ) | ( p[2] << 8 ) | ( p[3] );
-
- for( l = ipstats; l; l = l->next )
- {
- if( l->ip == ip )
- return( l );
+
+ sscanf(ip_txt, "%d.%d.%d.%d", p + 0, p + 1, p + 2, p + 3);
+ ip = (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | (p[3]);
+
+ for (l = ipstats; l; l = l->next) {
+ if (l->ip == ip) {
+ return(l);
+ }
}
-
- if( ipstats )
- {
- for( l = ipstats; l->next; l = l->next );
-
- l->next = malloc( sizeof( ipstats_t ) );
+
+ if (ipstats) {
+ for (l = ipstats; l->next; l = l->next) {
+ ;
+ }
+
+ l->next = malloc(sizeof(ipstats_t));
l = l->next;
- }
- else
- {
- l = malloc( sizeof( ipstats_t ) );
+ } else {
+ l = malloc(sizeof(ipstats_t));
ipstats = l;
}
- memset( l, 0, sizeof( ipstats_t ) );
-
+ memset(l, 0, sizeof(ipstats_t));
+
l->ip = ip;
-
- return( l );
+
+ return(l);
}
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