FONNEMANN Mark, on sam. 29 avril 2017 18:25:26 +0000, wrote:
> 0 packets received by filter
Ok, so nothing going out from qemu. Could you try to apply the attached
patch to qemu-2.9 and see what it makes qemu print when you resolve a
domain from the guest?
Samuel
--- a/slirp/socket.c
+++ b/slirp/socket.c
@@ -814,11 +814,18 @@ void sotranslate_out(struct socket *so,
switch (addr->ss_family) {
case AF_INET:
+ fprintf(stderr,"translating %x against %x %x\n",
+ so->so_faddr.s_addr,
+ slirp->vnetwork_mask.s_addr,
+ slirp->vnameserver_addr.s_addr);
if ((so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) ==
slirp->vnetwork_addr.s_addr) {
/* It's an alias */
+ fprintf(stderr,"it's an alias\n");
if (so->so_faddr.s_addr == slirp->vnameserver_addr.s_addr) {
+ fprintf(stderr,"it's DNS\n");
if (get_dns_addr(&sin->sin_addr) < 0) {
+ fprintf(stderr,"didn't get DNS address");
sin->sin_addr = loopback_addr;
}
} else {
--- a/slirp/udp.c
+++ b/slirp/udp.c
@@ -133,6 +133,10 @@ udp_input(register struct mbuf *m, int i
lhost4->sin_addr = ip->ip_src;
lhost4->sin_port = uh->uh_sport;
+ if (ntohs(uh->uh_dport) == 53 &&
+ ip->ip_dst.s_addr == slirp->vnameserver_addr.s_addr)
+ fprintf(stderr,"UDP packet for DNS server\n");
+
/*
* handle DHCP/BOOTP
*/
--- a/slirp/slirp.c
+++ b/slirp/slirp.c
@@ -165,6 +165,7 @@ static int get_dns_addr_resolv_conf(int
#endif
while (fgets(buff, 512, f) != NULL) {
if (sscanf(buff, "nameserver%*[ \t]%256s", buff2) == 1) {
+ fprintf(stderr,"got resolv.conf entry '%s'\n", buff2);
char *c = strchr(buff2, '%');
if (c) {
if_index = if_nametoindex(c + 1);
@@ -174,10 +175,16 @@ static int get_dns_addr_resolv_conf(int
}
if (!inet_pton(af, buff2, tmp_addr)) {
+ fprintf(stderr,"couldn't parse it\n");
continue;
}
/* If it's the first one, set it to dns_addr */
if (!found) {
+ if (af == AF_INET)
+ {
+ struct sockaddr_in *sin = tmp_addr;
+ fprintf(stderr,"parsed %x\n", sin->sin_addr.s_addr);
+ }
memcpy(pdns_addr, tmp_addr, addrlen);
memcpy(cached_addr, tmp_addr, addrlen);
if (scope_id) {
@@ -219,6 +226,7 @@ int get_dns_addr(struct in_addr *pdns_ad
if (dns_addr.s_addr != 0) {
int ret;
+ fprintf(stderr,"dns_addr is cached: %x\n", dns_addr.s_addr);
ret = get_dns_addr_cached(pdns_addr, &dns_addr, sizeof(dns_addr),
&dns_addr_stat, &dns_addr_time);
if (ret <= 0) {
