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lib9/dial: add support for IPv6

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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The sockaddr_in and sockaddr_un structures have been replaced
by sockaddr_storage to handle Unix, IPv4 and IPv6 sockets.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
This commit is contained in:
David du Colombier 2012-06-02 21:50:59 +02:00
parent 5d03af6557
commit 3409bc9ae1
6 changed files with 107 additions and 119 deletions
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2
include/libc.h
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@ -542,7 +542,7 @@ extern void privfree(void**);
extern int p9accept(int, char*);
extern int p9announce(char*, char*);
extern int p9dial(char*, char*, char*, int*);
extern int p9dialparse(char *ds, char **net, char **unixa, u32int *ip, int *port);
extern int p9dialparse(char *ds, char **net, char **unixa, void *ip, int *port);
extern void p9setnetmtpt(char*, int, char*);
extern int p9listen(char*, char*);
extern char* p9netmkaddr(char*, char*, char*);