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basic tcp handling (missing files)

master
Olaf Rempel 13 years ago
parent
commit
f5d8287cc6
  1. 101
      logging.c
  2. 19
      logging.h
  3. 117
      sockaddr.c
  4. 14
      sockaddr.h
  5. 135
      tcpsocket.c
  6. 12
      tcpsocket.h

101
logging.c

@ -0,0 +1,101 @@
/***************************************************************************
* Copyright (C) 07/2007 by Olaf Rempel *
* razzor@kopf-tisch.de *
* *
* 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; version 2 of the License *
* *
* 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 <stdlib.h>
#include <time.h>
#include <stdarg.h>
#include <errno.h>
#include <string.h>
#include "logging.h"
#define BUFSIZE 8192
static FILE *log_fd = NULL;
static int log_prio = LOG_EVERYTIME;
static char *buffer = NULL;
int log_print(int prio, const char *fmt, ...)
{
va_list az;
int len = 0, retval;
if (prio < log_prio)
return 0;
if (buffer == NULL) {
buffer = malloc(BUFSIZE);
if (buffer == NULL) {
fprintf(stderr, "log_print(): out of memory\n");
return -1;
}
}
if (log_fd != NULL) {
time_t tzgr;
time(&tzgr);
len += strftime(buffer, BUFSIZE, "%b %d %H:%M:%S :", localtime(&tzgr));
}
va_start(az, fmt);
len += vsnprintf(buffer + len, BUFSIZE - len, fmt, az);
va_end(az);
if (len < 0 || len >= BUFSIZE) {
errno = 0;
return log_print(LOG_ERROR, "log_print: arguments too long");
}
if (errno) {
len += snprintf(buffer + len, BUFSIZE - len, ": %s", strerror(errno));
errno = 0;
}
retval = fprintf((log_fd ? log_fd : stderr), "%s\n", buffer);
fflush(log_fd);
return retval;
}
void log_close(void)
{
if (buffer)
free(buffer);
if (log_fd)
fclose(log_fd);
}
int log_init(const char *logfile)
{
if (log_fd != NULL)
log_close();
log_fd = fopen(logfile, "a");
if (log_fd == NULL) {
fprintf(stderr, "log_init(): can not open logfile");
return -1;
}
return 0;
}
void log_setprio(int prio)
{
log_prio = prio;
}

19
logging.h

@ -0,0 +1,19 @@
#ifndef _LOGGING_H_
#define _LOGGING_H_
#define LOG_DEBUG 5
#define LOG_INFO 4
#define LOG_NOTICE 3
#define LOG_WARN 2
#define LOG_ERROR 1
#define LOG_CRIT 0
#define LOG_EVERYTIME 0
int log_init(const char *logfile);
void log_close(void);
void log_setprio(int prio);
int log_print(int prio, const char *fmt, ... );
#endif /* _LOGGING_H_ */

117
sockaddr.c

@ -0,0 +1,117 @@
/***************************************************************************
* Copyright (C) 07/2007 by Olaf Rempel *
* razzor@kopf-tisch.de *
* *
* 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; version 2 of the License *
* *
* 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 <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
int parse_sockaddr(const char *addr, struct sockaddr_in *sa)
{
char *buf = strdup(addr);
if (buf == NULL)
return -1;
char *tmp;
char *ipstr = strtok_r(buf, ":", &tmp);
if (ipstr == NULL) {
free(buf);
return -2;
}
sa->sin_family = AF_INET;
if (inet_pton(AF_INET, ipstr, &sa->sin_addr) <= 0) {
free(buf);
return -3;
}
char *portstr = strtok_r(NULL, " \r\n", &tmp);
if (portstr == NULL) {
free(buf);
return -4;
}
int port = atoi(portstr);
if (port < 0 || port > 65535) {
free(buf);
return -5;
}
sa->sin_port = htons(port);
free(buf);
return 0;
}
int parse_subnet(const char *addr, struct in_addr *net, struct in_addr *mask)
{
char *buf = strdup(addr);
if (buf == NULL)
return -1;
char *tmp;
char *netstr = strtok_r(buf, "/", &tmp);
if (netstr == NULL) {
free(buf);
return -2;
}
if (inet_pton(AF_INET, netstr, net) <= 0) {
free(buf);
return -3;
}
char *maskstr = strtok_r(NULL, " \r\n", &tmp);
if (maskstr == NULL) {
mask->s_addr = ~0;
} else if (inet_pton(AF_INET, maskstr, mask) <= 0) {
int maskbits = atoi(maskstr);
if (maskbits < 0 || maskbits > 32) {
free(buf);
return -4;
}
mask->s_addr = htonl(~0 << (32 - maskbits));
}
free(buf);
return 0;
}
int get_sockaddr(char *buf, int size, struct sockaddr_in *addr)
{
return snprintf(buf, size, "%s:%d", inet_ntoa(addr->sin_addr), ntohs(addr->sin_port));
}
char * get_sockaddr_buf(struct sockaddr_in *addr)
{
static char ret[24];
get_sockaddr(ret, sizeof(ret), addr);
return ret;
}
int same_sockaddr(struct sockaddr_in *a, struct sockaddr_in *b)
{
return !((a->sin_family ^ b->sin_family) |
(a->sin_addr.s_addr ^ b->sin_addr.s_addr) |
(a->sin_port ^ b->sin_port));
}

14
sockaddr.h

@ -0,0 +1,14 @@
#ifndef _SOCKADDR_H_
#define _SOCKADDR_H_
#include <netinet/in.h>
int parse_sockaddr(const char *addr, struct sockaddr_in *sa);
int parse_subnet(const char *addr, struct in_addr *net, struct in_addr *mask);
int get_sockaddr(char *buf, int size, struct sockaddr_in *addr);
char * get_sockaddr_buf(struct sockaddr_in *addr);
int same_sockaddr(struct sockaddr_in *a, struct sockaddr_in *b);
#endif /* _SOCKADDR_H_ */

135
tcpsocket.c

@ -0,0 +1,135 @@
/***************************************************************************
* Copyright (C) 07/2007 by Olaf Rempel *
* razzor@kopf-tisch.de *
* *
* 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; version 2 of the License *
* *
* 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 <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <errno.h>
#include "logging.h"
#include "sockaddr.h"
int tcp_listen(struct sockaddr_in *sa)
{
int sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock < 0 ) {
log_print(LOG_ERROR, "tcp_listen_socket(): socket()");
return -1;
}
int i = 1;
if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i))) {
log_print(LOG_ERROR, "tcp_listen_socket(): setsockopt(SO_REUSEADDR)");
close(sock);
return -1;
}
if (bind(sock, (struct sockaddr *)sa, sizeof(*sa))) {
log_print(LOG_ERROR, "tcp_listen_socket(): bind(%s)", get_sockaddr_buf(sa));
close(sock);
return -1;
}
if (listen(sock, 8)) {
log_print(LOG_ERROR, "tcp_listen_socket(): listen()");
close(sock);
return -1;
}
return sock;
}
int tcp_connect(struct sockaddr_in *sa)
{
int sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock < 0 ) {
log_print(LOG_ERROR, "tcp_connect_socket(): socket()");
return -1;
}
int ret = connect(sock, (struct sockaddr *)sa, sizeof(*sa));
if (ret != 0) {
log_print(LOG_ERROR, "tcp_connect(): connect(%s)", get_sockaddr_buf(sa));
close(sock);
return -1;
}
return sock;
}
int tcp_connect_nonblock(struct sockaddr_in *sa)
{
int sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock < 0 ) {
log_print(LOG_ERROR, "tcp_connect_nonblock(): socket()");
return -1;
}
int flags = fcntl(sock, F_GETFL, 0);
if (flags < 0) {
log_print(LOG_ERROR, "tcp_connect_nonblock(): fcntl(F_GETFL)");
close(sock);
return -1;
}
/* non-blocking connect() */
if (fcntl(sock, F_SETFL, flags | O_NONBLOCK)) {
log_print(LOG_ERROR, "tcp_connect_nonblock(): fcntl(F_SETFL)");
close(sock);
return -1;
}
int ret = connect(sock, (struct sockaddr *)sa, sizeof(*sa));
if (ret && errno != EINPROGRESS) {
log_print(LOG_ERROR, "tcp_connect_nonblock(): connect(%s)", get_sockaddr_buf(sa));
close(sock);
return -1;
}
/* reset EINPROGRESS */
errno = 0;
/* all further actions are blocking */
if (fcntl(sock, F_SETFL, flags)) {
log_print(LOG_ERROR, "tcp_connect_nonblock(): fcntl(F_SETFL)");
close(sock);
return -1;
}
return sock;
}
int tcp_connect_error(int fd)
{
int err;
unsigned int err_size = sizeof(err);
if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &err, &err_size)) {
log_print(LOG_ERROR, "tcp_connect_error(): getsockopt(SO_ERROR)");
return -1;
}
if (err) {
errno = err;
return -1;
}
return 0;
}

12
tcpsocket.h

@ -0,0 +1,12 @@
#ifndef _TCPSOCKET_H_
#define _TCPSOCKET_H_
#include <netinet/ip.h>
int tcp_listen(struct sockaddr_in *sa);
int tcp_connect(struct sockaddr_in *sa);
int tcp_connect_nonblock(struct sockaddr_in *sa);
int tcp_connect_error(int fd);
#endif // _TCPSOCKET_H_
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