Hello,
I'm playing around with IPv6 code on a FreeBSD 9 system and can't get
getaddrinfo(3C) to do what it should do as stated in its man page:
accept an IPv6 and IPv4 IP addr, it only works with the IPv6 form:
$ ./a.out ::1
host: ::1
read: SSH-2.0-OpenSSH_5.6p1 FreeBSD-20101111
$ ./a.out 127.0.0.1
host: 127.0.0.1
ssh: getaddrinfo failed code 8: hostname nor servname provided, or not known
$ telnet 127.0.0.1 22
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
SSH-2.0-OpenSSH_5.6p1 FreeBSD-20101111
the used C-code is attached below; what I'm doing wrong in the code?
Thanks
matthias
/* IPv6 client code using getaddrinfo */
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <netdb.h>
#include <string.h>
main(argc, argv) /* client side */
int argc;
char *argv[];
{
struct addrinfo req, *ans;
int code, s, n;
char buf[1024];
memset(&req, 0, sizeof(req));
req.ai_flags = AI_ADDRCONFIG|AI_NUMERICHOST;
req.ai_family = AF_INET6; /* Same as AF_INET6. */
req.ai_socktype = SOCK_STREAM;
/* */
/* Use default protocol (in this case tcp) */
/* */
req.ai_protocol = 0;
printf("host: %s\n", argv[1]);
if ((code = getaddrinfo(argv[1], "ssh", &req, &ans)) != 0) {
fprintf(stderr, "ssh: getaddrinfo failed code %d: %s\n", code,
gai_strerror(code));
exit(1);
}
/* */
/* ans must contain at least one addrinfo, use */
/* the first. */
/* */
s = socket(ans->ai_family, ans->ai_socktype, ans->ai_protocol);
if (s < 0) {
perror("ssh: socket");
exit(3);
}
/* Connect does the bind for us */
if (connect(s, ans->ai_addr, ans->ai_addrlen) < 0) {
perror("ssh: connect");
exit(5);
}
n = read(s, buf, 1024);
printf ("read: %s", buf);
/* */
/* Free answers after use */
/* */
freeaddrinfo(ans);
exit(0);
}
--
Matthias Apitz
e <g...@unixarea.de> - w http://www.unixarea.de/
UNIX since V7 on PDP-11, UNIX on mainframe since ESER 1055 (IBM /370)
UNIX on x86 since SVR4.2 UnixWare 2.1.2, FreeBSD since 2.2.5
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