| Message ID | 20170429191402.ebsdilnya67ispla@var.youpi.perso.aquilenet.fr |
|---|---|
| State | New |
| Headers | show |
>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?
After applying patch, compiling, installing and then doing a nslookup request in the guest, I still receive no output in tcpdump and my logfile is empty:
[mfonnemann@localhost qemu-2.9.0]$ make
make all-recursive
Making all in pixman
make[3]: Nothing to be done for `all'.
Making all in demos
make[3]: Nothing to be done for `all'.
Making all in test
make[3]: Nothing to be done for `all'.
CHK version_gen.h
CC slirp/slirp.o
CC slirp/socket.o
CC slirp/udp.o
LINK i386-softmmu/qemu-system-i386
LINK x86_64-softmmu/qemu-system-x86_64
[mfonnemann@localhost qemu-2.9.0]$ sudo make install
[sudo] password for mfonnemann:
make all-recursive
Making all in pixman
make[3]: Nothing to be done for `all'.
Making all in demos
make[3]: Nothing to be done for `all'.
Making all in test
make[3]: Nothing to be done for `all'.
CHK version_gen.h
install -d -m 0755 "/usr/local/share/qemu"
install -d -m 0755 "/usr/local/var"/run
install -d -m 0755 "/usr/local/bin"
install -c -m 0755 qemu-ga ivshmem-client ivshmem-server qemu-nbd qemu-img qemu-io "/usr/local/bin"
strip "/usr/local/bin/qemu-ga" "/usr/local/bin/ivshmem-client" "/usr/local/bin/ivshmem-server" "/usr/local/bin/qemu-nbd" "/usr/local/bin/qemu-img" "/usr/local/bin/qemu-io"
install -d -m 0755 "/usr/local/libexec"
install -c -m 0755 qemu-bridge-helper "/usr/local/libexec"
strip "/usr/local/libexec/qemu-bridge-helper"
set -e; for x in bios.bin bios-256k.bin sgabios.bin vgabios.bin vgabios-cirrus.bin vgabios-stdvga.bin vgabios-vmware.bin vgabios-qxl.bin vgabios-virtio.bin acpi-dsdt.aml ppc_rom.bin openbios-sparc32 openbios-sparc64 openbios-ppc QEMU,tcx.bin QEMU,cgthree.bin pxe-e1000.rom pxe-eepro100.rom pxe-ne2k_pci.rom pxe-pcnet.rom pxe-rtl8139.rom pxe-virtio.rom efi-e1000.rom efi-eepro100.rom efi-ne2k_pci.rom efi-pcnet.rom efi-rtl8139.rom efi-virtio.rom efi-e1000e.rom efi-vmxnet3.rom qemu-icon.bmp qemu_logo_no_text.svg bamboo.dtb petalogix-s3adsp1800.dtb petalogix-ml605.dtb multiboot.bin linuxboot.bin linuxboot_dma.bin kvmvapic.bin s390-ccw.img spapr-rtas.bin slof.bin skiboot.lid palcode-clipper u-boot.e500; do \
install -c -m 0644 /home/mfonnemann/qemu-2.9.0/pc-bios/$x "/usr/local/share/qemu"; \
done
install -d -m 0755 "/usr/local/share/qemu/keymaps"
set -e; for x in da en-gb et fr fr-ch is lt modifiers no pt-br sv ar de en-us fi fr-be hr it lv nl pl ru th common de-ch es fo fr-ca hu ja mk nl-be pt sl tr bepo cz; do \
install -c -m 0644 /home/mfonnemann/qemu-2.9.0/pc-bios/keymaps/$x "/usr/local/share/qemu/keymaps"; \
done
install -c -m 0644 /home/mfonnemann/qemu-2.9.0/trace-events-all "/usr/local/share/qemu/trace-events-all"
for d in i386-softmmu x86_64-softmmu; do \
make --no-print-directory BUILD_DIR=/home/mfonnemann/qemu-2.9.0 TARGET_DIR=$d/ -C $d install || exit 1 ; \
done
install -d -m 0755 "/usr/local/bin"
install -c -m 0755 qemu-system-i386 "/usr/local/bin"
strip "/usr/local/bin/qemu-system-i386"
install -d -m 0755 "/usr/local/bin"
install -c -m 0755 qemu-system-x86_64 "/usr/local/bin"
strip "/usr/local/bin/qemu-system-x86_64"
[mfonnemann@localhost qemu]$ /usr/local/bin/qemu-system-i386 -display curses -readconfig qemu.cfg -D logfile
root@qemu:~# nslookup www.google.com
*** Unknown host
nslookup: www.google.com: Unknown host
[mfonnemann@localhost qemu]$ ls -Al logfile
-rw-rw-r--. 1 mfonnemann mfonnemann 0 Apr 29 15:58 logfile
Mark.
--- 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) {
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