prepare C files to be compiled using C extensions
-sharpinclude <stdio.h>
-sharpinclude <stdlib.h>
-sharpinclude <unistd.h>
-sharpinclude <string.h>
-sharpinclude <errno.h>
-sharpinclude <netdb.h>
-sharpinclude <netinet/in.h>
-sharpinclude <netinet/ip.h>
-sharpinclude <netinet/tcp.h>
-sharpinclude <netinet/if_ether.h>
-sharpinclude <arpa/inet.h>
-sharpinclude <sys/socket.h>
-sharpinclude <pcap.h>
-sharpinclude <Python.h>
static PyObject *
demo_send(PyObject *self, PyObject *args)
{
const char* packet;
const int length;
// convert PyObject to C values
if (!PyArg_ParseTuple(args, "si", &packet, &length))
return NULL;
char *dev;
char errbuf[PCAP_ERRBUF_SIZE];
pcap_t* descr;
dev = pcap_lookupdev(errbuf);
if(dev == NULL) {
fprintf(stderr,"%s\n",errbuf);
exit(1);
}
descr = pcap_open_live(dev,BUFSIZ,1,-1,errbuf);
if(descr == NULL) {
printf("pcap_open_live(): %s\n",errbuf);
exit(1);
}
int sts = pcap_sendpacket(descr, packet, length);
return Py_BuildValue("i", sts);;
}
// module"s method table
static PyMethodDef DemoMethods[] = {
{"send", demo_send, METH_VARARGS, "Send packets"},
{NULL, NULL, 0, NULL}
};
// module" s initialization function
PyMODINIT_FUNC
initdemo(void)
{
(void)Py_InitModule("Csend", DemoMethods);
}and setup.py files
from distutils.core import setup, Extension
module1 = Extension("Csend",
sources = ["release.c"]
)
setup (name = "a demo extension module",
version = "1.0",
description = "send packets",
ext_modules = [module1]) but the compiled result has the error of
"ImportError:. / Csend.so: undefined symbol: pcap_sendpacket"
.
gcc-lpcap
I want to use C to speed up the delivery of python projects. As a result, there is a problem with using C extension during compilation. If there are any other options for sending packages, you can also ask for advice. Thank you!