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/**\file srUtils.c
* \brief General utilties that fit nowhere else.
*
* The namespace for this file is "srUtil".
*
* \author Rainer Gerhards <rgerhards@adiscon.com>
* \date 2003-09-09
* Coding begun.
*
* Copyright 2003-2007 Rainer Gerhards and Adiscon GmbH.
*
* This file is part of rsyslog.
*
* Rsyslog 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 3 of the License, or
* (at your option) any later version.
*
* Rsyslog 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 Rsyslog. If not, see <http://www.gnu.org/licenses/>.
*
* A copy of the GPL can be found in the file "COPYING" in this distribution.
*/
#include "config.h"
#include "rsyslog.h" /* THIS IS A MODIFICATION FOR RSYSLOG! 2004-11-18 rgerards */
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <signal.h>
#include <assert.h>
#include <sys/wait.h>
#include <ctype.h>
#include "liblogging-stub.h" /* THIS IS A MODIFICATION FOR RSYSLOG! 2004-11-18 rgerards */
#define TRUE 1
#define FALSE 0
#include "srUtils.h"
#include "syslogd.h"
/* ################################################################# *
* private members *
* ################################################################# */
/* As this is not a "real" object, there won't be any private
* members in this file.
*/
/* ################################################################# *
* public members *
* ################################################################# */
rsRetVal srUtilItoA(char *pBuf, int iLenBuf, int iToConv)
{
int i;
int bIsNegative;
char szBuf[32]; /* sufficiently large for my lifespan and those of my children... ;) */
assert(pBuf != NULL);
assert(iLenBuf > 1); /* This is actually an app error and as thus checked for... */
if(iToConv < 0)
{
bIsNegative = TRUE;
iToConv *= -1;
}
else
bIsNegative = FALSE;
/* first generate a string with the digits in the reverse direction */
i = 0;
do
{
szBuf[i] = iToConv % 10 + '0';
iToConv /= 10;
} while(iToConv > 0); /* warning: do...while()! */
/* make sure we are within bounds... */
if(i + 2 > iLenBuf) /* +2 because: a) i starts at zero! b) the \0 byte */
return RS_RET_PROVIDED_BUFFER_TOO_SMALL;
/* then move it to the right direction... */
if(bIsNegative == TRUE)
*pBuf++ = '-';
while(i >= 0)
*pBuf++ = szBuf[i--];
*pBuf = '\0'; /* terminate it!!! */
return RS_RET_OK;
}
uchar *srUtilStrDup(uchar *pOld, size_t len)
{
uchar *pNew;
assert(pOld != NULL);
if((pNew = malloc(len + 1)) != NULL)
memcpy(pNew, pOld, len + 1);
return pNew;
}
/* creates a path recursively
* Return 0 on success, -1 otherwise. On failure, errno
* hold the last OS error.
* Param "mode" holds the mode that all non-existing directories
* are to be created with.
*/
int makeFileParentDirs(uchar *szFile, size_t lenFile, mode_t mode,
uid_t uid, gid_t gid, int bFailOnChownFail)
{
uchar *p;
uchar *pszWork;
size_t len;
int bErr = 0;
assert(szFile != NULL);
assert(lenFile > 0);
len = lenFile + 1; /* add one for '\0'-byte */
if((pszWork = malloc(sizeof(uchar) * len)) == NULL)
return -1;
memcpy(pszWork, szFile, len);
for(p = pszWork+1 ; *p ; p++)
if(*p == '/') {
/* temporarily terminate string, create dir and go on */
*p = '\0';
if(access((char*)pszWork, F_OK)) {
if(mkdir((char*)pszWork, mode) == 0) {
if(uid != (uid_t) -1 || gid != (gid_t) -1) {
/* we need to set owner/group */
if(chown((char*)pszWork, uid, gid) != 0)
if(bFailOnChownFail)
bErr = 1;
/* silently ignore if configured
* to do so.
*/
}
} else
bErr = 1;
if(bErr) {
int eSave = errno;
free(pszWork);
errno = eSave;
return -1;
}
}
*p = '/';
}
free(pszWork);
return 0;
}
/* execute a program with a single argument
* returns child pid if everything ok, 0 on failure. if
* it fails, errno is set. if it fails after the fork(), the caller
* can not be notfied for obvious reasons. if bwait is set to 1,
* the code waits until the child terminates - that potentially takes
* a lot of time.
* implemented 2007-07-20 rgerhards
*/
int execProg(uchar *program, int bWait, uchar *arg)
{
int pid;
int sig;
struct sigaction sigAct;
dbgprintf("exec program '%s' with param '%s'\n", program, arg);
pid = fork();
if (pid < 0) {
return 0;
}
if(pid) { /* Parent */
if(bWait)
if(waitpid(pid, NULL, 0) == -1)
if(errno != ECHILD) {
/* we do not use logerror(), because
* that might bring us into an endless
* loop. At some time, we may
* reconsider this behaviour.
*/
dbgprintf("could not wait on child after executing '%s'",
(char*)program);
}
return pid;
}
/* Child */
alarm(0); /* create a clean environment before we exec the real child */
memset(&sigAct, 0, sizeof(sigAct));
sigemptyset(&sigAct.sa_mask);
sigAct.sa_handler = SIG_DFL;
for(sig = 1 ; sig < NSIG ; ++sig)
sigaction(sig, &sigAct, NULL);
execlp((char*)program, (char*) program, (char*)arg, NULL);
/* In the long term, it's a good idea to implement some enhanced error
* checking here. However, it can not easily be done. For starters, we
* may run into endless loops if we log to syslog. The next problem is
* that output is typically not seen by the user. For the time being,
* we use no error reporting, which is quite consitent with the old
* system() way of doing things. rgerhards, 2007-07-20
*/
perror("exec");
exit(1); /* not much we can do in this case */
}
/* skip over whitespace in a standard C string. The
* provided pointer is advanced to the first non-whitespace
* charater or the \0 byte, if there is none. It is never
* moved past the \0.
*/
void skipWhiteSpace(uchar **pp)
{
register uchar *p;
assert(pp != NULL);
assert(*pp != NULL);
p = *pp;
while(*p && isspace((int) *p))
++p;
*pp = p;
}
/*
* vi:set ai:
*/
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