[Gumstix-users] Gumstix freezes with sniffer

[Jonathan.Trowbridge <jon...@gm...>]

Hey all,

I just got my gumstix up and running smoothly and i wrote a small little
sniffer to go along with it in C. It compiles fine without any errors and
runs flawlessly on other Linux boxes. The only problem is when I run it on
the gumstix it hangs and locks up the whole system. =[ I noticed that it
hangs when it has to process alot of packets at once. I tried setting a
timeout in pcap_open_live() but it didn't seem to work. If anyone could help
me out and tell me why it's locking it up that'd be nice. =P

Here's the code:

<code>
#include <stdio.h>
#include <pcap.h>

static char errbuf[PCAP_ERRBUF_SIZE];
static pcap_t *session;
static const u_char *pkt_data;
static struct pcap_pkthdr *pkt_header;

int main(int argc, char *argv[]) {
        const char *dev = argv[1];

        printf("Opening device[%s]...", dev);
        session = pcap_open_live(dev, 65535, 1, 0, errbuf);
        printf("Done.\n");

        int z = 0;
        for(;z < 100;z++) {
                pcap_next_ex(session, &pkt_header, &pkt_data);
                printf("Length: %d\n", pkt_header->caplen);
                int i = 0, x = 0;

                for(;i < pkt_header->caplen;i++) {
                        for(x = 0;x < 16;x++) {
                                int value = pkt_data[i+x];
                                if(value >= 32 && value <= 126)printf("%c",
pkt_data[i + x]);
                                else printf(".");
                        }
                        printf("   ");
                        for(x = 0;x < 16;x++) {
                                if((x % 4) == 0)printf(" ");
                                printf("%02X", pkt_data[i + x]);
                        }

                        i += 16;
                        printf("\n");
                }
        }
}</code>
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