[Qemu-devel] [PATCHv2 4/5] slirp: Support link-local DNS addresses

[Samuel Thibault]

They look like fe80::%eth0

Signed-off-by: Samuel Thibault <samuel.thiba...@ens-lyon.org>
Reviewed-by: Thomas Huth <th...@redhat.com>
---
 slirp/libslirp.h |  2 +-
 slirp/slirp.c    | 26 ++++++++++++++++++++++----
 slirp/socket.c   |  2 +-
 3 files changed, 24 insertions(+), 6 deletions(-)

diff --git a/slirp/libslirp.h b/slirp/libslirp.h
index b0cfbc5..81bd139 100644
--- a/slirp/libslirp.h
+++ b/slirp/libslirp.h
@@ -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, unsigned *scope_id);
 
 Slirp *slirp_init(int restricted, bool in_enabled, struct in_addr vnetwork,
                   struct in_addr vnetmask, struct in_addr vhost,
diff --git a/slirp/slirp.c b/slirp/slirp.c
index c6bcc6e..c00fa32 100644
--- a/slirp/slirp.c
+++ b/slirp/slirp.c
@@ -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 */
@@ -138,13 +142,15 @@ 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, unsigned *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 +161,14 @@ 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 +176,9 @@ 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 +222,10 @@ 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, unsigned *scope_id)
 {
     static struct stat dns6_addr_stat;
 
@@ -221,7 +238,8 @@ 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
diff --git a/slirp/socket.c b/slirp/socket.c
index 653257d..896c27e 100644
--- a/slirp/socket.c
+++ b/slirp/socket.c
@@ -796,7 +796,7 @@ 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) {
+                if (get_dns6_addr(&sin6->sin6_addr, &sin6->sin6_scope_id) < 0) 
{
                     sin6->sin6_addr = in6addr_loopback;
                 }
             } else {
-- 
2.8.0.rc3