I keep getting this errror. I installed libnetfilter_queue and
libnetfilter_conntrack using yum. The shared libraries are in the
right places (/usr/lib/ and /usr/lib64/) and I'm using the -l options
(-lnfnetlink -lnetfilter_queue). Not sure why it's not working. Here
is the output:
g++ -g -Wall -c test.cpp -o test.o
g++ -lnfnetlink -lnetfilter_queue test.o -o test
test.o: In function `main':
test.cpp:65: undefined reference to `nfq_open()'
test.cpp:72: undefined reference to `nfq_unbind_pf(nfq_handle*, unsigned short)'
test.cpp:78: undefined reference to `nfq_bind_pf(nfq_handle*, unsigned short)'
test.cpp:84: undefined reference to `nfq_create_queue(nfq_handle*,
unsigned short, int (*)(nfq_q_handle*, nfgenmsg*, nfq_data*, void*),
void*)'
test.cpp:91: undefined reference to `nfq_set_mode(nfq_q_handle*,
unsigned char, unsigned int)'
test.cpp:97: undefined reference to
`nfq_set_queue_maxlen(nfq_q_handle*, unsigned int)'
test.cpp:103: undefined reference to `nfq_nfnlh(nfq_handle*)'
test.cpp:104: undefined reference to `nfnl_fd(nfnl_handle*)'
test.cpp:108: undefined reference to `nfq_handle_packet(nfq_handle*,
char*, int)'
test.cpp:112: undefined reference to `nfq_destroy_queue(nfq_q_handle*)'
test.cpp:115: undefined reference to `nfq_close(nfq_handle*)'
test.o: In function `print_pkt':
test.cpp:18: undefined reference to `nfq_get_msg_packet_hdr(nfq_data*)'
test.cpp:25: undefined reference to `nfq_get_nfmark(nfq_data*)'
test.cpp:29: undefined reference to `nfq_get_indev(nfq_data*)'
test.cpp:33: undefined reference to `nfq_get_outdev(nfq_data*)'
test.cpp:37: undefined reference to `nfq_get_payload(nfq_data*, char**)'
test.o: In function `cb':
test.cpp:52: undefined reference to `nfq_set_verdict(nfq_q_handle*,
unsigned int, unsigned int, unsigned int, unsigned char*)'
collect2: ld returned 1 exit status
make: *** [test] Error 1
Here is my simplistic Makefile:
LDOPTS =
LIBS = -lnfnetlink -lnetfilter_queue
INCDIR =
CXXFLAGS= -g -Wall#$(INCDIR)
sources := $(wildcard *.cpp) $(wildcard *.c)
objs := $(sources)
objs := $(objs:.c=.o)
objs := $(objs:.cpp=.o)
all: test
clean:
rm -f $(objs) test
test: $(objs)
$(CXX) $(LDOPTS) $(LIBS) $^ -o $@
.c.o:
$(CC) $(CXXFLAGS) -c $< -o $@
.cpp.o:
$(CXX) $(CXXFLAGS) -c $< -o $@
Can anybody point me in the right direction? Don't know why it
doesn't want to link.
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