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/* snoopy.c -- execve() logging wrapper
* Copyright (c) 2000 marius@linux.com,mbm@linux.com
* Version 1.3
*
* $Id: snoopy.c,v 1.32 2000/12/21 06:53:03 marius Exp $
*
* Part hacked on flight KL 0617, 30,000 ft or so over the Atlantic :)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <stdio.h>
#include <sys/types.h>
#include <dlfcn.h>
#include <syslog.h>
#include "snoopy.h"
#define min(a,b) a<b?a:b
#if defined(RTLD_NEXT)
# define REAL_LIBC RTLD_NEXT
#else
# define REAL_LIBC ((void *) -1L)
#endif
#define FN(ptr,type,name,args) ptr = (type (*)args)dlsym (REAL_LIBC, name)
static inline void log(const char *filename, char **argv) {
static char *logstring=NULL;
static int argc, size=0;
register int i, spos=0;
#if INTEGRITY_CHECK
static char **argv_copy;
static int *t_size;
#endif
#if ROOT_ONLY
if (getuid() != 0)
return;
#endif
#if IGNORE_NULL
if (getlogin() == 0)
return;
#endif
for(argc=0; *(argv+argc)!='\0';argc++);
#if INTEGRITY_CHECK
argv_copy = (char**)malloc(sizeof(char*)*argc);
t_size = (int*)malloc(sizeof(int)*argc);
for(i=0; i<argc; i++) {
size = sizeof(char)*strlen(*(argv+i));
*(t_size+i) = size;
*(argv_copy+i) = (char*)malloc(size);
memcpy(*(argv_copy+i), *(argv+i), size);
}
*(argv_copy+argc) = '\0';
size=0;
#endif
openlog("snoopy", LOG_PID, LOG_AUTHPRIV);
#if MAX
logstring = (char *)malloc(sizeof(char)*MAX*argc);
for(i=0; i<argc; i++)
spos += min(snprintf(logstring+spos, MAX, "%s ", *(argv+i)), MAX);
#else
for(i=0; i<argc; i++)
size += sizeof(char)*strlen(*(argv+i))+1;
size++; /*make space for that \0*/
logstring = (char*)malloc(sizeof(char)*size);
for(i=0; i<argc; i++)
spos += sprintf(logstring+spos, "%s ", *(argv+i));
#endif
#if INTEGRITY_CHECK
for(i=0; i<argc; i++)
if(memcmp(*(argv+i), *(argv_copy+i), *(t_size+i)))
syslog(LOG_ERR, "Integrity check failed");
for(i=0; i<argc; i++)
free(*(argv_copy+i));
#endif
syslog(LOG_INFO, "[%s, uid:%d sid:%d]: %s", getlogin(), getuid(), getsid(0), logstring);
free(logstring);
}
int execve(const char *filename, char **argv, char **envp) {
static int (*func)(const char *, char **, char **);
FN(func,int,"execve",(const char *, char **, char **));
log(filename, argv);
return (*func) (filename, argv, envp);
}
int execv(const char *filename, char **argv) {
static int (*func)(const char *, char **);
FN(func,int,"execv",(const char *, char **));
log(filename, argv);
return (*func) (filename, argv);
}
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