am 2f7b72f9: netstat should include /proc/net/tcp6 and /proc/net/udp6 data

 * SUCH DAMAGE.

 */

#include <arpa/inet.h>

#include <stdio.h>

#include <stdlib.h>

#include <sys/socket.h>

#include <sys/types.h>

typedef union iaddr iaddr;

typedef union iaddr6 iaddr6;

union iaddr {

    unsigned u;

    unsigned char b[4];

};

union iaddr6 {

    struct {

        unsigned a;

        unsigned b;

        unsigned c;

        unsigned d;

    } u;

    unsigned char b[16];

};

static const char *state2str(unsigned state)

{

    switch(state){

    }

}

void addr2str(iaddr addr, unsigned port, char *buf)

/* addr + : + port + \0 */

#define ADDR_LEN INET6_ADDRSTRLEN + 1 + 5 + 1

static void addr2str(int af, const void *addr, unsigned port, char *buf)

{

    if (inet_ntop(af, addr, buf, ADDR_LEN) == NULL) {

        *buf = '\0';

        return;

    }

    size_t len = strlen(buf);

    if (port) {

        snprintf(buf, 64, "%d.%d.%d.%d:%d",

                 addr.b[0], addr.b[1], addr.b[2], addr.b[3], port);

        snprintf(buf+len, ADDR_LEN-len, ":%d", port);

    } else {

        snprintf(buf, 64, "%d.%d.%d.%d:*",

                 addr.b[0], addr.b[1], addr.b[2], addr.b[3]);

        strncat(buf+len, ":*", ADDR_LEN-len-1);

    }

}

int netstat_main(int argc, char *argv[])

{

    char buf[512];

    char lip[64];

    char rip[64];

static void ipv4(const char *filename, const char *label) {

    FILE *fp = fopen(filename, "r");

    if (fp == NULL) {

        return;

    }

    char buf[BUFSIZ];

    fgets(buf, BUFSIZ, fp);

    while (fgets(buf, BUFSIZ, fp)){

        char lip[ADDR_LEN];

        char rip[ADDR_LEN];

        iaddr laddr, raddr;

        unsigned lport, rport, state, txq, rxq, num;

    int n;

    FILE *fp;

    printf("Proto Recv-Q Send-Q Local Address          Foreign Address        State\n");

    fp = fopen("/proc/net/tcp", "r");

    if(fp != 0) {

        fgets(buf, 512, fp);

        while(fgets(buf, 512, fp)){

            n = sscanf(buf, " %d: %x:%x %x:%x %x %x:%x",

        int n = sscanf(buf, " %d: %x:%x %x:%x %x %x:%x",

                       &num, &laddr.u, &lport, &raddr.u, &rport,

                       &state, &txq, &rxq);

        if (n == 8) {

                addr2str(laddr, lport, lip);

                addr2str(raddr, rport, rip);

            addr2str(AF_INET, &laddr, lport, lip);

            addr2str(AF_INET, &raddr, rport, rip);

                printf("tcp   %6d %6d %-22s %-22s %s\n", 

                       txq, rxq, lip, rip,

            printf("%4s  %6d %6d %-22s %-22s %s\n",

                   label, txq, rxq, lip, rip,

                   state2str(state));

        }

    }

    fclose(fp);

}

    fp = fopen("/proc/net/udp", "r");

    if(fp != 0) {

        fgets(buf, 512, fp);

        while(fgets(buf, 512, fp)){

            n = sscanf(buf, " %d: %x:%x %x:%x %x %x:%x",

                       &num, &laddr.u, &lport, &raddr.u, &rport,

static void ipv6(const char *filename, const char *label) {

    FILE *fp = fopen(filename, "r");

    if (fp == NULL) {

        return;

    }

    char buf[BUFSIZ];

    fgets(buf, BUFSIZ, fp);

    while (fgets(buf, BUFSIZ, fp)){

        char lip[ADDR_LEN];

        char rip[ADDR_LEN];

        iaddr6 laddr6, raddr6;

        unsigned lport, rport, state, txq, rxq, num;

        int n = sscanf(buf, " %d: %8x%8x%8x%8x:%x %8x%8x%8x%8x:%x %x %x:%x",

                       &num, &laddr6.u.a, &laddr6.u.b, &laddr6.u.c, &laddr6.u.d, &lport,

                       &raddr6.u.a, &raddr6.u.b, &raddr6.u.c, &raddr6.u.d, &rport,

                       &state, &txq, &rxq);

            if(n == 8) {

                addr2str(laddr, lport, lip);

                addr2str(raddr, rport, rip);

        if (n == 14) {

            addr2str(AF_INET6, &laddr6, lport, lip);

            addr2str(AF_INET6, &raddr6, rport, rip);

                printf("udp   %6d %6d %-22s %-22s\n", 

                       txq, rxq, lip, rip);

            printf("%4s  %6d %6d %-22s %-22s %s\n",

                   label, txq, rxq, lip, rip,

                   state2str(state));

        }

    }

    fclose(fp);

}

int netstat_main(int argc, char *argv[])

{

    printf("Proto Recv-Q Send-Q Local Address          Foreign Address        State\n");

    ipv4("/proc/net/tcp",  "tcp");

    ipv4("/proc/net/udp",  "udp");

    ipv6("/proc/net/tcp6", "tcp6");

    ipv6("/proc/net/udp6", "udp6");

    return 0;

}