104 lines
3.3 KiB
C
104 lines
3.3 KiB
C
|
/**
|
||
|
|
* @file find_program.h
|
||
|
|
* @author Ambroz Bizjak <ambrop7@gmail.com>
|
||
|
|
*
|
||
|
|
* @section LICENSE
|
||
|
|
*
|
||
|
|
* Redistribution and use in source and binary forms, with or without
|
||
|
|
* modification, are permitted provided that the following conditions are met:
|
||
|
|
* 1. Redistributions of source code must retain the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer.
|
||
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer in the
|
||
|
|
* documentation and/or other materials provided with the distribution.
|
||
|
|
* 3. Neither the name of the author nor the
|
||
|
|
* names of its contributors may be used to endorse or promote products
|
||
|
|
* derived from this software without specific prior written permission.
|
||
|
|
*
|
||
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
|
||
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
||
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
||
|
|
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
|
||
|
|
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
||
|
|
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
||
|
|
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
||
|
|
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
||
|
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||
|
|
*
|
||
|
|
* @section DESCRIPTION
|
||
|
|
*
|
||
|
|
* Function that finds the absolute path of a program by checking a predefined
|
||
|
|
* list of directories.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef BADVPN_FIND_PROGRAM_H
|
||
|
|
#define BADVPN_FIND_PROGRAM_H
|
||
|
|
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
#include <string.h>
|
||
|
|
|
||
|
|
#include <misc/concat_strings.h>
|
||
|
|
#include <misc/debug.h>
|
||
|
|
#include <misc/balloc.h>
|
||
|
|
|
||
|
|
static char * badvpn_find_program (const char *name);
|
||
|
|
|
||
|
|
static char * badvpn_find_program (const char *name)
|
||
|
|
{
|
||
|
|
ASSERT(name)
|
||
|
|
|
||
|
|
char *path = getenv("PATH");
|
||
|
|
if (path) {
|
||
|
|
while (1) {
|
||
|
|
size_t i = 0;
|
||
|
|
while (path[i] != ':' && path[i] != '\0') {
|
||
|
|
i++;
|
||
|
|
}
|
||
|
|
char const *src = path;
|
||
|
|
size_t src_len = i;
|
||
|
|
if (src_len == 0) {
|
||
|
|
src = ".";
|
||
|
|
src_len = 1;
|
||
|
|
}
|
||
|
|
size_t name_len = strlen(name);
|
||
|
|
char *entry = BAllocSize(bsize_add(bsize_fromsize(src_len), bsize_add(bsize_fromsize(name_len), bsize_fromsize(2))));
|
||
|
|
if (!entry) {
|
||
|
|
goto fail;
|
||
|
|
}
|
||
|
|
memcpy(entry, src, src_len);
|
||
|
|
entry[src_len] = '/';
|
||
|
|
strcpy(entry + (src_len + 1), name);
|
||
|
|
if (access(entry, X_OK) == 0) {
|
||
|
|
return entry;
|
||
|
|
}
|
||
|
|
free(entry);
|
||
|
|
if (path[i] == '\0') {
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
path += i + 1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
const char *dirs[] = {"/usr/sbin", "/usr/bin", "/sbin", "/bin", NULL};
|
||
|
|
|
||
|
|
for (size_t i = 0; dirs[i]; i++) {
|
||
|
|
char *path = concat_strings(3, dirs[i], "/", name);
|
||
|
|
if (!path) {
|
||
|
|
goto fail;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (access(path, X_OK) == 0) {
|
||
|
|
return path;
|
||
|
|
}
|
||
|
|
|
||
|
|
free(path);
|
||
|
|
}
|
||
|
|
|
||
|
|
fail:
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|