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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <signal.h>
#include <sys/types.h>
#include <grp.h>
#include <dirent.h>
#ifdef FreeBSD
#include <sys/syslimits.h>
#define SU "/usr/bin/su"
#define CP "/bin/cp"
#define KILLALL "/usr/bin/killall"
#endif
#ifdef Linux
#include <linux/limits.h>
#define SU "/bin/su"
#define CP "/bin/cp"
#define KILLALL "/usr/bin/killall"
#endif
void usage(void)
{
printf("usage: bbsctl [start|stop|restart|bbsadm|test]\n"
" bbsctl start start mbbsd at 23,3000-3010\n"
" bbsctl stop killall listening mbbsd\n"
" bbsctl restart stop + start\n"
" bbsctl bbsadm su to bbsadm\n"
" bbsctl test use bbsadm permission to exec ./mbbsd 9000\n");
exit(0);
}
int HaveBBSADM(void)
{
gid_t gids[NGROUPS_MAX];
int i, ngids;
struct group *gr;
ngids = getgroups(NGROUPS_MAX, gids);
if( (gr = getgrnam("bbsadm")) == NULL ){
puts("group bbsadm not found");
return 0;
}
for( i = 0 ; i < ngids ; ++i )
if( gr->gr_gid == gids[i] )
break;
if( i == ngids ){
puts("permission denied");
return 0;
}
return 1;
}
void startbbs(void)
{
if( setuid(0) < 0 ){
perror("setuid(0)");
exit(1);
}
puts("starting mbbsd: 23"); system("/home/bbs/bin/mbbsd 23");
puts("starting mbbsd:3000"); system("/home/bbs/bin/mbbsd 3000");
puts("starting mbbsd:3001"); system("/home/bbs/bin/mbbsd 3001");
puts("starting mbbsd:3002"); system("/home/bbs/bin/mbbsd 3002");
puts("starting mbbsd:3003"); system("/home/bbs/bin/mbbsd 3003");
puts("starting mbbsd:3004"); system("/home/bbs/bin/mbbsd 3004");
puts("starting mbbsd:3005"); system("/home/bbs/bin/mbbsd 3005");
puts("starting mbbsd:3006"); system("/home/bbs/bin/mbbsd 3006");
puts("starting mbbsd:3007"); system("/home/bbs/bin/mbbsd 3007");
puts("starting mbbsd:3008"); system("/home/bbs/bin/mbbsd 3008");
puts("starting mbbsd:3009"); system("/home/bbs/bin/mbbsd 3009");
puts("starting mbbsd:3010"); system("/home/bbs/bin/mbbsd 3010");
}
void stopbbs(void)
{
DIR *dirp;
struct dirent *de;
FILE *fp;
char buf[512];
if( !(dirp = opendir("/proc")) ){
perror("open /proc");
exit(0);
}
while( (de = readdir(dirp)) ){
if( de->d_type & DT_DIR ){
sprintf(buf, "/proc/%s/cmdline", de->d_name);
if( (fp = fopen(buf, "r")) ){
if( fgets(buf, sizeof(buf), fp) != NULL ){
if( strstr(buf, "mbbsd") && strstr(buf, "listening") ){
kill(atoi(de->d_name), 1);
printf("stopping mbbsd at pid %5d\n", atoi(de->d_name));
}
}
fclose(fp);
}
}
}
closedir(dirp);
}
void restartbbs(void)
{
stopbbs();
sleep(1);
startbbs();
}
void bbsadm(void)
{
if( setuid(0) < 0 ){
perror("setuid(0)");
return;
}
puts("permission granted");
execl(SU, "su", "bbsadm", NULL);
}
void bbstest(void)
{
if( access("mbbsd", 0) < 0 ){
perror("./mbbsd");
return;
}
system(CP " -f mbbsd testmbbsd");
if( setuid(0) < 0 ){
perror("setuid(0)");
return;
}
if( setuid(9999) < 0 ){
perror("setuid(9999)");
return;
}
system(KILLALL " testmbbsd");
execl("./testmbbsd", "testmbbsd", "9000", NULL);
perror("execl()");
}
struct {
char *cmd;
void (*func)();
}cmds[] = { {"start", startbbs},
{"stop", stopbbs},
{"restart", restartbbs},
{"bbsadm", bbsadm},
{"test", bbstest},
{NULL, NULL} };
int main(int argc, char **argv)
{
int i;
if( argc == 1 )
usage();
if( !HaveBBSADM() )
return 1;
for( i = 0 ; cmds[i].cmd != NULL ; ++i )
if( strcmp(cmds[i].cmd, argv[1]) == 0 ){
cmds[i].func();
break;
}
if( cmds[i].cmd == NULL ){
printf("command %s not found\n", argv[1]);
usage();
}
return 0;
}
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