linux下获取网络流量的实现方法

来源：互联网发布：氨基转换作用实验数据编辑：程序博客网时间：2024/06/04 19:13

仅是通过/proc/net/dev读取其中的数据.(转载)

#include
#include
#include

void skipline(FILE *f)
{
int ch;
do {
ch = getc(f);
} while ( ch != 'n' && ch != EOF );
}

int main(int argc, char *argv[])
{
FILE *pnd;
char buffer[BUFSIZ];
char *interface;
struct ifinfo {
    char name[8];
    unsigned int r_bytes, r_pkt, r_err, r_drop, r_fifo, r_frame;
    unsigned int r_compr, r_mcast;
    unsigned int x_bytes, x_pkt, x_err, x_drop, x_fifo, x_coll;
    unsigned int x_carrier, x_compr;
} ifc;
unsigned long long bin, bout, lbin, lbout;
int first;

if ( argc != 2 ) {
fprintf(stderr, "Usage: %s interfacen", argv[0]);
exit(1);
}

interface = argv[1];

first = 1;
lbin = 0; lbout = 0;

while ( 1 ) {
    pnd = fopen("/proc/net/dev", "r");
    if ( !pnd ) {
      fprintf(stderr, "%s: /proc/net/dev: %s", argv[0], strerror(errno));
      exit(1);
    }

    /* Skip header */
    skipline(pnd);
    skipline(pnd);

    /* Get interface info */
    do {
      if ( fscanf(pnd, " %6[^:]:%u %u %u %u %u %u %u %u %u %u %u %u %u %u %u",
                  &ifc.name,
                  &ifc.r_bytes, &ifc.r_pkt, &ifc.r_err, &ifc.r_drop,
                  &ifc.r_fifo, &ifc.r_frame, &ifc.r_compr, &ifc.r_mcast,
                  &ifc.x_bytes, &ifc.x_pkt, &ifc.x_err, &ifc.x_drop,
                  &ifc.x_fifo, &ifc.x_coll, &ifc.x_carrier, &ifc.x_compr)
           != 16 ) {
        exit(200);
      }
      skipline(pnd);
    } while ( strcmp(ifc.name, interface) );

bin = ifc.r_bytes + (lbin & ~0xffffffffULL);
bout = ifc.x_bytes + (lbout & ~0xffffffffULL);

    if ( bin < lbin )
      bin += (1ULL << 32);
    if ( bout < lbout )
      bout += (1ULL << 32);

    if ( !first ) {
      printf("%d %Lu %Lun", time(NULL), (bout-lbout)*8, (bin-lbin)*8);
      fflush(stdout);
    } else {
      first = 0;
    }

lbin = bin; lbout = bout;

fclose(pnd);

sleep(1);
}
}