/*********************************************************************************
|
* Copyright: (C) 2014 Guo Wenxue<guowenxue@gmail.com>
|
* All rights reserved.
|
*
|
* Filename: cp_socket.c
|
* Description: This file
|
*
|
* Version: 1.0.0(11/18/2014)
|
* Author: Guo Wenxue <guowenxue@gmail.com>
|
* ChangeLog: 1, Release initial version on "11/18/2014 11:15:04 PM"
|
*
|
********************************************************************************/
|
#include <stdio.h>
|
#include <unistd.h>
|
#include <string.h>
|
#include <netdb.h>
|
#include <unistd.h>
|
#include <fcntl.h>
|
|
#include <sys/un.h>
|
#include <sys/types.h>
|
#include <linux/sockios.h>
|
#include <sys/ioctl.h>
|
#include <sys/socket.h>
|
#include <netinet/in.h>
|
#include <arpa/inet.h>
|
|
#include "cp_logger.h"
|
#include "cp_socket.h"
|
|
int cp_sock_block_connect(cp_socket_t *sock, char *servaddr, unsigned short servport)
|
{
|
int rv = -1;
|
int sock_fd = -1;
|
char service[20];
|
struct addrinfo hints, *rp;
|
struct addrinfo *res = NULL;
|
struct in_addr inaddr;
|
char ipstr[20];
|
int len;
|
|
if(!sock || !servaddr || !servport )
|
{
|
log_err("Invalid input argument\n");
|
return -1;
|
}
|
|
if(SOCK_STAT_CONNECTED == sock->status)
|
{
|
return 0;
|
}
|
|
len = strlen(servaddr);
|
len = len>DOMAIN_MAX_LEN ? DOMAIN_MAX_LEN : len;
|
|
memcpy(sock->servaddr, servaddr, strlen(servaddr));
|
sock->servport = servport;
|
|
log_nrml("Start socket connect to [%s:%d]...\n", sock->servaddr, sock->servport);
|
|
memset(&hints, 0, sizeof(struct addrinfo));
|
hints.ai_family = AF_INET; /* Only support IPv4 */
|
hints.ai_socktype = SOCK_STREAM;
|
|
/* If Hostname is a valid IP address, then don't use name resolution */
|
if( inet_aton(sock->servaddr, &inaddr) )
|
{
|
log_info("%s is a valid IP address, don't use name resolution.\n", sock->servaddr);
|
hints.ai_flags |= AI_NUMERICHOST;
|
}
|
|
/* Obtain address(es) matching servaddr/servport */
|
snprintf(service, sizeof(service), "%d", sock->servport);
|
if( (rv=getaddrinfo(sock->servaddr, service, &hints, &res)) )
|
{
|
log_err("getaddrinfo() parser [%s:%s] failed: %s\n", sock->servaddr, service, gai_strerror(rv));
|
rv = -2;
|
goto out;
|
}
|
|
/* getaddrinfo() returns a list of address structures. Try each address until connected */
|
rv = -3; /* default return value set be connect failure */
|
sock->status = SOCK_STAT_DISCONNECT;
|
for (rp=res; rp!=NULL; rp=rp->ai_next)
|
{
|
/* create the socket */
|
sock_fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
|
if( sock_fd < 0)
|
{
|
log_err("socket() create failed: %s\n", strerror(errno));
|
rv = -4;
|
continue;
|
}
|
|
inet_ntop(AF_INET, &(((struct sockaddr_in *)(rp->ai_addr))->sin_addr), ipstr, sizeof(ipstr));
|
log_dbg("DNS resolve IP address [%s]\n", ipstr);
|
|
/* connect to the remote server successfully */
|
if(0==connect(sock_fd, rp->ai_addr, rp->ai_addrlen))
|
{
|
memcpy(&sock->saddr, &rp->ai_addr, sizeof(sock->saddr));
|
sock->fd = sock_fd;
|
sock->status = SOCK_STAT_CONNECTED;
|
rv = 0;
|
goto out;
|
}
|
else /* Connect to server failed. */
|
{
|
rv = -5;
|
log_err("connect() to server IP[%s] failed: %s\n", ipstr, strerror(errno));
|
}
|
|
close(sock_fd);
|
}
|
|
|
out:
|
if( rv < 0 )
|
{
|
log_err("create socket connect to [%s:%d] failed: %s\n", sock->servaddr, sock->servport, strerror(errno));
|
sock->status = SOCK_STAT_DISCONNECT;
|
sock->fd = -1;
|
}
|
else
|
{
|
log_nrml("create socket connect to [%s:%d] successfully\n", sock->servaddr, sock->servport);
|
sock->status = SOCK_STAT_CONNECTED;
|
}
|
|
if(res)
|
{
|
freeaddrinfo(res);
|
}
|
|
return rv;
|
}
|
|
int cp_sock_nonblock_connect(cp_socket_t *sock, char *servaddr, unsigned short servport)
|
{
|
int rv = -1;
|
int sock_fd = -1;
|
char service[20];
|
struct addrinfo hints, *rp;
|
struct addrinfo *res = NULL;
|
struct in_addr inaddr;
|
char ipstr[20];
|
|
if( !sock || !servaddr || !servport )
|
{
|
log_err("Invalid input argument\n");
|
return -1;
|
}
|
|
if(SOCK_STAT_CONNECTED == sock->status)
|
{
|
return 0;
|
}
|
else if(SOCK_STAT_CONNECTING == sock->status)
|
{
|
goto connecting;
|
}
|
|
log_nrml("Start socket connect to [%s:%d]...\n", sock->servaddr, sock->servport);
|
|
memset(&hints, 0, sizeof(struct addrinfo));
|
hints.ai_family = AF_INET; /* Only support IPv4 */
|
hints.ai_socktype = SOCK_STREAM;
|
|
/* If Hostname is a valid IP address, then don't use name resolution */
|
if( inet_aton(sock->servaddr, &inaddr) )
|
{
|
log_info("%s is a valid IP address, don't use name resolution.\n", sock->servaddr);
|
hints.ai_flags |= AI_NUMERICHOST;
|
}
|
|
/* Obtain address(es) matching servaddr/servport */
|
snprintf(service, sizeof(service), "%d", sock->servport);
|
if( (rv=getaddrinfo(sock->servaddr, service, &hints, &res)) )
|
{
|
log_err("getaddrinfo() parser [%s:%s] failed: %s\n", sock->servaddr, service, gai_strerror(rv));
|
rv = -2;
|
goto failed;
|
}
|
|
|
/* getaddrinfo() returns a list of address structures. Try each
|
* address until we successfully connect or bind
|
*/
|
rv = -3; /* Connect failure */
|
for (rp=res; rp!=NULL; rp=rp->ai_next)
|
{
|
/* Create the socket */
|
sock_fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
|
if( sock_fd < 0)
|
{
|
log_err("socket() create failed: %s\n", strerror(errno));
|
rv = -4;
|
continue;
|
}
|
|
inet_ntop(AF_INET, &(((struct sockaddr_in *)(rp->ai_addr))->sin_addr), ipstr, sizeof(ipstr));
|
log_dbg("DNS resolve IP address [%s]\n", ipstr);
|
|
cp_sock_set_nonblock(sock_fd);
|
|
/* Nono block Connect to the remote server */
|
if(0==connect(sock_fd, rp->ai_addr, rp->ai_addrlen))
|
{
|
/* Conenct to server successfully */
|
memcpy(&sock->saddr, &rp->ai_addr, sizeof(sock->saddr));
|
sock->fd = sock_fd;
|
sock->status = SOCK_STAT_CONNECTED;
|
rv = 0;
|
goto connected;
|
}
|
else
|
{
|
if(EINPROGRESS == errno)
|
{
|
/* Connect to server now in progress */
|
memcpy(&sock->saddr, &rp->ai_addr, sizeof(sock->saddr));
|
sock->fd = sock_fd;
|
sock->status = SOCK_STAT_CONNECTING;
|
rv = 0;
|
goto connecting;
|
}
|
else
|
{
|
/* Connect to server failed. */
|
close(sock_fd);
|
rv = -5;
|
log_err("connect() to server failed: %s\n", strerror(errno));
|
goto failed;
|
}
|
}
|
|
close(sock_fd);
|
}
|
|
|
failed:
|
log_err("create socket connect to [%s:%d] failed: %s\n", sock->servaddr, sock->servport, strerror(errno));
|
sock->status = SOCK_STAT_DISCONNECT;
|
sock->fd = -1;
|
return rv;
|
|
connecting:
|
if(SOCK_STAT_CONNECTING == sock->status)
|
{
|
int len;
|
|
len = sizeof(sock->saddr);
|
|
errno = 0;
|
if( 0 == connect(sock->fd, &sock->saddr, len) )
|
{
|
/* connect() return 0 means it already connected */
|
sock->status = SOCK_STAT_CONNECTED;
|
rv = 0;
|
goto connected;
|
}
|
|
/* Connect failure will continue to check */
|
switch (errno)
|
{
|
case EISCONN:
|
sock->status = SOCK_STAT_CONNECTED;
|
rv = 0;
|
goto connected;
|
|
case EALREADY:
|
case EINPROGRESS:
|
log_dbg("socket[%d] connect to remote [%s:%d] in progress\n", sock->fd, sock->servaddr, sock->servport);
|
rv = 0;
|
goto cleanup;
|
|
default:
|
log_err("socket[%d] connect to remote [%s:%d] failed: %s\n", sock->fd, sock->servaddr, sock->servport, strerror(errno));
|
sock->status = SOCK_STAT_DISCONNECT;
|
rv = -7;
|
break;
|
}
|
}
|
|
connected:
|
if(SOCK_STAT_CONNECTED == sock->status)
|
{
|
rv = 0;
|
log_nrml("socket[%d] connected to remote server [%s:%d]\n", sock->fd, sock->servaddr, sock->servport);
|
goto cleanup;
|
}
|
|
cleanup:
|
if(res)
|
freeaddrinfo(res); /* No longer needed */
|
|
return rv;
|
}
|
|
|
int cp_sock_set_nonblock(int sockfd)
|
{
|
int opts;
|
/*
|
* fcntl may set:
|
*
|
* EACCES, EAGAIN: Operation is prohibited by locks held by other
|
* processes. Or, operation is prohibited because the file has
|
* been memory-mapped by another process.
|
* EBADF: fd is not an open file descriptor, or the command was F_SETLK
|
* or F_SETLKW and the file descriptor open mode doesn't match
|
* with the type of lock requested.
|
* EDEADLK: It was detected that the specified F_SETLKW command would
|
* cause a deadlock.
|
* EFAULT: lock is outside your accessible address space.
|
* EINTR: For F_SETLKW, the command was interrupted by a signal. For
|
* F_GETLK and F_SETLK, the command was interrupted by a signal
|
* before the lock was checked or acquired. Most likely when
|
* locking a remote file (e.g. locking over NFS), but can
|
* sometimes happen locally.
|
* EINVAL: For F_DUPFD, arg is negative or is greater than the maximum
|
* allowable value. For F_SETSIG, arg is not an allowable signal
|
* number.
|
* EMFILE: For F_DUPFD, the process already has the maximum number of
|
* file descriptors open.
|
* ENOLCK: Too many segment locks open, lock table is full, or a remote
|
* locking protocol failed (e.g. locking over NFS).
|
* EPERM: Attempted to clear the O_APPEND flag on a file that has the
|
* append-only attribute set.
|
*/
|
opts = fcntl(sockfd, F_GETFL);
|
if (opts < 0)
|
{
|
log_warn("fcntl() get socket options failure: %s\n", strerror(errno));
|
return -1;
|
}
|
|
opts |= O_NONBLOCK;
|
if (fcntl(sockfd, F_SETFL, opts) < 0)
|
{
|
log_warn("fcntl() set socket options failure: %s\n", strerror(errno));
|
return -1;
|
}
|
|
log_dbg("Set socket[%d] none blocking\n", sockfd);
|
return opts;
|
}
|
|
|
|
void cp_sock_close(cp_socket_t *sock)
|
{
|
close(sock->fd);
|
sock->fd = 0;
|
sock->status = SOCK_STAT_INIT;
|
}
|
