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slirp: Support link-local DNS addresses 

They look like fe80::%eth0

Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>

---
Changes since last submission:
- fix windows build
This commit is contained in:
Samuel Thibault 2016-03-20 15:16:21 +01:00
parent 1d17654e76
commit ef763fa4bd
3 changed files with 32 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
slirp/libslirp.h
View File

@ -7,7 +7,7 @@ struct Slirp;
typedef struct Slirp Slirp;
int get_dns_addr(struct in_addr *pdns_addr);
int get_dns6_addr(struct in6_addr *pdns6_addr);
int get_dns6_addr(struct in6_addr *pdns6_addr, uint32_t *scope_id);
Slirp *slirp_init(int restricted, bool in_enabled, struct in_addr vnetwork,
struct in_addr vnetmask, struct in_addr vhost,

32
slirp/slirp.c
View File

@ -30,6 +30,10 @@
#include "hw/hw.h"
#include "qemu/cutils.h"
#ifndef _WIN32
#include <net/if.h>
#endif
/* host loopback address */
struct in_addr loopback_addr;
/* host loopback network mask */
@ -46,9 +50,13 @@ static QTAILQ_HEAD(slirp_instances, Slirp) slirp_instances =
QTAILQ_HEAD_INITIALIZER(slirp_instances);
static struct in_addr dns_addr;
#ifndef _WIN32
static struct in6_addr dns6_addr;
#endif
static u_int dns_addr_time;
#ifndef _WIN32
static u_int dns6_addr_time;
#endif
#define TIMEOUT_FAST 2 /* milliseconds */
#define TIMEOUT_SLOW 499 /* milliseconds */
@ -102,7 +110,7 @@ int get_dns_addr(struct in_addr *pdns_addr)
return 0;
}
int get_dns6_addr(struct in6_addr *pdns_addr6)
int get_dns6_addr(struct in6_addr *pdns6_addr, uint32_t *scope_id)
{
return -1;
}
@ -138,13 +146,15 @@ static int get_dns_addr_cached(void *pdns_addr, void *cached_addr,
}
static int get_dns_addr_resolv_conf(int af, void *pdns_addr, void *cached_addr,
socklen_t addrlen, u_int *cached_time)
socklen_t addrlen, uint32_t *scope_id,
u_int *cached_time)
{
char buff[512];
char buff2[257];
FILE *f;
int found = 0;
void *tmp_addr = alloca(addrlen);
unsigned if_index;
f = fopen("/etc/resolv.conf", "r");
if (!f)
@ -155,6 +165,14 @@ static int get_dns_addr_resolv_conf(int af, void *pdns_addr, void *cached_addr,
#endif
while (fgets(buff, 512, f) != NULL) {
if (sscanf(buff, "nameserver%*[ \t]%256s", buff2) == 1) {
char *c = strchr(buff2, '%');
if (c) {
if_index = if_nametoindex(c + 1);
*c = '\0';
} else {
if_index = 0;
}
if (!inet_pton(af, buff2, tmp_addr)) {
continue;
}
@ -162,6 +180,9 @@ static int get_dns_addr_resolv_conf(int af, void *pdns_addr, void *cached_addr,
if (!found) {
memcpy(pdns_addr, tmp_addr, addrlen);
memcpy(cached_addr, tmp_addr, addrlen);
if (scope_id) {
*scope_id = if_index;
}
*cached_time = curtime;
}
#ifdef DEBUG
@ -205,10 +226,10 @@ int get_dns_addr(struct in_addr *pdns_addr)
}
}
return get_dns_addr_resolv_conf(AF_INET, pdns_addr, &dns_addr,
sizeof(dns_addr), &dns_addr_time);
sizeof(dns_addr), NULL, &dns_addr_time);
}
int get_dns6_addr(struct in6_addr *pdns6_addr)
int get_dns6_addr(struct in6_addr *pdns6_addr, uint32_t *scope_id)
{
static struct stat dns6_addr_stat;
@ -221,7 +242,8 @@ int get_dns6_addr(struct in6_addr *pdns6_addr)
}
}
return get_dns_addr_resolv_conf(AF_INET6, pdns6_addr, &dns6_addr,
sizeof(dns6_addr), &dns6_addr_time);
sizeof(dns6_addr),
scope_id, &dns6_addr_time);
}
#endif

5
slirp/socket.c
View File

@ -816,7 +816,10 @@ void sotranslate_out(struct socket *so, struct sockaddr_storage *addr)
if (in6_equal_net(&so->so_faddr6, &slirp->vprefix_addr6,
slirp->vprefix_len)) {
if (in6_equal(&so->so_faddr6, &slirp->vnameserver_addr6)) {
if (get_dns6_addr(&sin6->sin6_addr) < 0) {
uint32_t scope_id;
if (get_dns6_addr(&sin6->sin6_addr, &scope_id) >= 0) {
sin6->sin6_scope_id = scope_id;
} else {
sin6->sin6_addr = in6addr_loopback;
}
} else {