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libsxmp/examples/helpers.c

118 lines
2.6 KiB
C

/*
* Secure X Message Passing Library v2 examples.
*
* (c) Originally written by somebody else ...
* (c) Alexander Vdolainen 2013-2015 <avdolainen@gmail.com>
*
* libsxmp is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* libsxmp 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.";
*
* This is a simple helpers to make code more clean;
*
*/
#include <stdio.h>
#include <dirent.h>
#define __USE_GNU
#include <stdlib.h>
#include <stdarg.h>
#include <sys/types.h>
#include <limits.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <sys/resource.h>
#include <netdb.h>
#include <unistd.h>
#include <netinet/in.h>
#include <stdint.h>
#include <errno.h>
#include <string.h>
int openlistener_socket(int port)
{
int sd;
struct sockaddr_in addr;
sd = socket(PF_INET, SOCK_STREAM, 0);
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
addr.sin_addr.s_addr = INADDR_ANY;
if(bind(sd, (struct sockaddr*)&addr, sizeof(addr)) != 0) {
perror("can't bind port");
abort();
}
if(listen(sd, 10) != 0) {
perror("Can't configure listening port");
abort();
}
return sd;
}
char *nodehostname(void)
{
char *hm = malloc(HOST_NAME_MAX);
if(!gethostname(hm, HOST_NAME_MAX))
return hm;
else {
if(hm) free(hm);
return NULL;
}
}
static inline int __removechar(char *b, size_t chrs)
{
char *c = b + chrs;
size_t blen = strlen(c) + sizeof(char);
memmove(b, c, blen);
return chrs;
}
int normalize_path(char *path)
{
char *obuf = path;
int cutlen;
/* first remove useless / if found */
while((obuf = strchr(obuf, '/'))) {
obuf++;
while(*obuf == '/') __removechar(obuf, 1);
}
obuf = path; /* much cleaner now */
while(*obuf != '\0') {
if(*obuf == '.' && *(obuf - 1) == '/') {
if(!strcmp(obuf, "./")) __removechar(obuf, 2);
else if(!strcmp(obuf, "../")) {
cutlen = strlen(path) - strlen(obuf);
if(cutlen < 4) return -1;
else cutlen = 4;
obuf -= 2;
while(*obuf != '/') {
obuf--; cutlen++;
}
__removechar(obuf, cutlen);
}
}
obuf++;
}
return 0;
}