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lib9/dial: add support for IPv6 The function p9dialparse() returns the host as a sockaddr_storage structure instead of a u32int, to be able to handle both IPv4 and IPv6 addresses. Because the sockaddr_storage structure also handle port numbers and Unix path names, there is no longer need to set them in the calling functions. However, these values are still returned for convenience. The sockaddr_in and sockaddr_un structures have been replaced by sockaddr_storage to handle Unix, IPv4 and IPv6 sockets. Names and addresses are resolved using either gethostbyname() or getaddrinfo() functions. The getaddrinfo() function is documented in RFC2553 and standardized since POSIX.1-2001. It supports both IPv4 and IPv6 addresses. The gethostbyname() function is deprecated since POSIX.1-2008. However, some libc implementations don't handle getaddrinfo() properly, thus we preferred to try gethostbyname() first. I've tried to preserve most of the old code logic to prevent from surprising or unwanted behavior. R=rsc http://codereview.appspot.com/6255068
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1 #include <u.h>

2 #include <sys/socket.h>

3 #include <netinet/in.h>

4 #include <arpa/inet.h>

5 #include <libc.h>

6 #include "mountnfs.h"

8 void

9 usage(void)

10 {

11 	fprint(2, "usage: vmount [-v] [-h handle] address mountpoint\n");

12 	exits("usage");

13 }

15 int handlelen = 1;

16 uchar handle[64] = {

17 	0x00

18 };

20 void

21 main(int argc, char **argv)

22 {

23 	char *p, *net, *unx;

24 	char host[INET_ADDRSTRLEN];

25 	int n, port, proto, verbose;

26 	struct sockaddr_in sa;

28 	verbose = 0;

29 	ARGBEGIN{

30 	case 'h':

31 		p = EARGF(usage());

32 		n = strlen(p);

33 		if(n%2)

34 			sysfatal("bad handle '%s'", p);

35 		if(n > 2*sizeof handle)

36 			sysfatal("handle too long '%s'", p);

37 		handlelen = n/2;

38 		if(dec16(handle, n/2, p, n) != n/2)

39 			sysfatal("bad hex in handle '%s'", p);

40 		break;

42 	case 'v':

43 		verbose = 1;

44 		break;

46 	default:

47 		usage();

48 	}ARGEND

50 	if(argc != 2)

51 		usage();

53 	p = p9netmkaddr(argv[0], "udp", "nfs");

54 	if(p9dialparse(strdup(p), &net, &unx, &sa, &port) < 0)

55 		sysfatal("bad address '%s'", p);

57 	if(sa.sin_family != AF_INET)

58 		sysfatal("only IPv4 is supported");

60 	inet_ntop(AF_INET, &(sa.sin_addr), host, INET_ADDRSTRLEN);

62 	if(verbose)

63 		print("nfs server is net=%s addr=%s port=%d\n",

64 			net, host, port);

66 	proto = 0;

67 	if(strcmp(net, "tcp") == 0)

68 		proto = SOCK_STREAM;

69 	else if(strcmp(net, "udp") == 0)

70 		proto = SOCK_DGRAM;

71 	else

72 		sysfatal("bad proto %s: can only handle tcp and udp", net);

74 	mountnfs(proto, &sa, handle, handlelen, argv[1]);

75 	exits(0);

76 }