Comments (4)
dnswatch requires libbpf 1.1.0 (as is stated in the readme, and evident from [email protected]
version) , and Ubuntu 22.04 ships with version 0.5.
Can you verify that what you have installed is indeed libbpf 1.1.0 or later?
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Hello,
sorry for replying so late. You were right, libbpf 1.1.0 was missing, I had another version installed. I fixed that and installed the right library but now I got a follow up error.
$ make
bpftool btf dump file /sys/kernel/btf/vmlinux format c > bpf/vmlinux.h
clang -g -O2 -Wall -fpie -fno-stack-protector -I /usr/include/bpf -target bpf -D__TARGET_ARCH_x86 -I bpf -c bpf/dnswatch.bpf.c -o snoop/out/dnswatch_bpf_probe_core.o
bpf/dnswatch.bpf.c:44:16: error: use of undeclared identifier 'BPF_MAP_TYPE_RINGBUF'
__uint(type, BPF_MAP_TYPE_RINGBUF);
^
bpf/dnswatch.bpf.c:167:25: warning: incompatible pointer types passing 'unsigned long long *' to parameter of type 'struct pt_regs *' [-Wincompatible-pointer-types]
return sendmsg_solver(ctx, 0, dport, sport);
^~~
bpf/dnswatch.bpf.c:108:32: note: passing argument to parameter 'ctx' here
sendmsg_solver(struct pt_regs* ctx, char fn_id, u16 dport, u16 sport) {
^
bpf/dnswatch.bpf.c:184:25: warning: incompatible pointer types passing 'unsigned long long *' to parameter of type 'struct pt_regs *' [-Wincompatible-pointer-types]
return sendmsg_solver(ctx, 1, dport, sport);
^~~
bpf/dnswatch.bpf.c:108:32: note: passing argument to parameter 'ctx' here
sendmsg_solver(struct pt_regs* ctx, char fn_id, u16 dport, u16 sport) {
^
bpf/dnswatch.bpf.c:194:25: warning: incompatible pointer types passing 'unsigned long long *' to parameter of type 'struct pt_regs *' [-Wincompatible-pointer-types]
return sendmsg_solver(ctx, 2, dport, dport);
^~~
bpf/dnswatch.bpf.c:108:32: note: passing argument to parameter 'ctx' here
sendmsg_solver(struct pt_regs* ctx, char fn_id, u16 dport, u16 sport) {
^
3 warnings and 1 error generated.
make: *** [Makefile:9: snoop/out/dnswatch_bpf_probe_core.o] Fehler 1
This one is tripping me up as well. If you have any idea how to navigate this, it would be very helpful. Looks like the code is missing a variable declaration...
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on a fresh VM i installed the deps and built dnswatch succesfully
root@scw-elated-fermi:~/dns/dnswatch# cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=22.04
DISTRIB_CODENAME=jammy
DISTRIB_DESCRIPTION="Ubuntu 22.04.3 LTS"
root@scw-elated-fermi:~/dns/dnswatch# make clean
rm -f snoop/out/dnswatch_bpf_probe_core.o
rm -f bpf/vmlinux.h
root@scw-elated-fermi:~/dns/dnswatch# make
bpftool btf dump file /sys/kernel/btf/vmlinux format c > bpf/vmlinux.h
clang -g -O2 -Wall -fpie -fno-stack-protector -I /usr/include/bpf -target bpf -D__TARGET_ARCH_x86 -I bpf -c bpf/dnswatch.bpf.c -o snoop/out/dnswatch_bpf_probe_core.o
bpf/dnswatch.bpf.c:96:25: warning: incompatible pointer types passing 'unsigned long long *' to parameter of type 'struct pt_regs *' [-Wincompatible-pointer-types]
return sendmsg_solver(ctx, 0, dport, sport);
^~~
bpf/dnswatch.bpf.c:48:32: note: passing argument to parameter 'ctx' here
sendmsg_solver(struct pt_regs* ctx, char fn_id, u16 dport, u16 sport) {
^
bpf/dnswatch.bpf.c:113:25: warning: incompatible pointer types passing 'unsigned long long *' to parameter of type 'struct pt_regs *' [-Wincompatible-pointer-types]
return sendmsg_solver(ctx, 1, dport, sport);
^~~
bpf/dnswatch.bpf.c:48:32: note: passing argument to parameter 'ctx' here
sendmsg_solver(struct pt_regs* ctx, char fn_id, u16 dport, u16 sport) {
^
bpf/dnswatch.bpf.c:123:25: warning: incompatible pointer types passing 'unsigned long long *' to parameter of type 'struct pt_regs *' [-Wincompatible-pointer-types]
return sendmsg_solver(ctx, 2, dport, dport);
^~~
bpf/dnswatch.bpf.c:48:32: note: passing argument to parameter 'ctx' here
sendmsg_solver(struct pt_regs* ctx, char fn_id, u16 dport, u16 sport) {
^
bpf/dnswatch.bpf.c:118:14: warning: variable 'sport' set but not used [-Wunused-but-set-variable]
u16 dport, sport;
^
4 warnings generated.
CGO_LDFLAGS="-lbpf" CGO_CFLAGS="-I /usr/include/bpf -I /usr/include/pcap" go build .
root@scw-elated-fermi:~/dns/dnswatch# ./dnswatch snoop
INFO[0000] PID PNAME TYPE QNAME RCODE
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No updates for half a year, the issue seems to be fixed.
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