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A patch from Bart Visscher <magick@linux-fan.com> to add an

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xconnect helper routine which does:
        -address and port resolving
	-tries to connect to all resolved addresses until connected
	-uses getaddrinfo, so works for IPv6 too
This patch also ports rdate, telnet, and wget to use the new
xconnect function.  Thanks Bart!
This commit is contained in:
Eric Andersen
2002-07-03 11:51:44 +00:00
parent 51b8bd68bb
commit 0b31586c71
4 changed files with 93 additions and 117 deletions
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78
libbb/xconnect.c Normal file
View File

@ -0,0 +1,78 @@
/* vi: set sw=4 ts=4: */
/*
* Utility routines.
*
* Connect to host at port using address resolusion from getaddrinfo
*
*/
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <stdlib.h>
#include "libbb.h"
int xconnect(const char *host, const char *port)
{
#if CONFIG_FEATURE_IPV6
struct addrinfo hints;
struct addrinfo *res;
struct addrinfo *addr_info;
int error;
int s;
memset(&hints, 0, sizeof(hints));
/* set-up hints structure */
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
error = getaddrinfo(host, port, &hints, &res);
if (error||!res)
perror_msg_and_die(gai_strerror(error));
addr_info=res;
while (res) {
s=socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (s<0)
{
error=s;
res=res->ai_next;
continue;
}
/* try to connect() to res->ai_addr */
error = connect(s, res->ai_addr, res->ai_addrlen);
if (error >= 0)
break;
close(s);
res=res->ai_next;
}
freeaddrinfo(addr_info);
if (error < 0)
{
perror_msg_and_die("Unable to connect to remote host (%s)", host);
}
return s;
#else
struct sockaddr_in s_addr;
int s = socket(AF_INET, SOCK_STREAM, 0);
struct servent *tserv;
int port_nr=atoi(port);
struct hostent * he;
if (port_nr==0 && (tserv = getservbyname(port, "tcp")) != NULL)
port_nr = tserv->s_port;
memset(&s_addr, 0, sizeof(struct sockaddr_in));
s_addr.sin_family = AF_INET;
s_addr.sin_port = htons(port_nr);
he = xgethostbyname(host);
memcpy(&s_addr.sin_addr, he->h_addr, sizeof s_addr.sin_addr);
if (connect(s, (struct sockaddr *)&s_addr, sizeof s_addr) < 0)
{
perror_msg_and_die("Unable to connect to remote host (%s)", host);
}
return s;
#endif
}