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authorRob Landley <rob@landley.net>2013-07-25 13:30:58 -0500
committerRob Landley <rob@landley.net>2013-07-25 13:30:58 -0500
commit74323a5a5369573804a8d5ac36a3d4f216a24184 (patch)
treea4bff16146b2dca2080b9b080ce575a32e845db7
parent4c7cf4e3bdc9c839e5cce087d304482dcced8074 (diff)
downloadtoybox-74323a5a5369573804a8d5ac36a3d4f216a24184.tar.gz
netstat by Ranjan Kumar.
-rw-r--r--toys/pending/netstat.c658
1 files changed, 658 insertions, 0 deletions
diff --git a/toys/pending/netstat.c b/toys/pending/netstat.c
new file mode 100644
index 00000000..a246e93a
--- /dev/null
+++ b/toys/pending/netstat.c
@@ -0,0 +1,658 @@
+/* netstat.c - Display Linux networking subsystem.
+ *
+ * Copyright 2012 Ranjan Kumar <ranjankumar.bth@gmail.com>
+ *
+ * Not in SUSv4.
+ *
+USE_NETSTAT(NEWTOY(netstat, "pWrxwutneal", TOYFLAG_BIN))
+config NETSTAT
+ bool "netstat"
+ default n
+ help
+ usage: netstat [-pWrxwutneal]
+
+ Display networking information.
+
+ -r Display routing table.
+ -a Display all sockets (Default: Connected).
+ -l Display listening server sockets.
+ -t Display TCP sockets.
+ -u Display UDP sockets.
+ -w Display Raw sockets.
+ -x Display Unix sockets.
+ -e Display other/more information.
+ -n Don't resolve names.
+ -W Wide Display.
+ -p Display PID/Program name for sockets.
+*/
+
+#define FOR_netstat
+#include "toys.h"
+#include "toynet.h"
+#include <net/route.h>
+
+typedef union _iaddr {
+ unsigned u;
+ unsigned char b[4];
+} iaddr;
+
+typedef union _iaddr6 {
+ struct {
+ unsigned a;
+ unsigned b;
+ unsigned c;
+ unsigned d;
+ } u;
+ unsigned char b[16];
+} iaddr6;
+
+#define ADDR_LEN (INET6_ADDRSTRLEN + 1 + 5 + 1) //IPv6 addr len + : + port + '\0'
+
+//For unix states
+enum {
+ SOCK_ACCEPTCON = (1 << 16), //performed a listen.
+ SOCK_WAIT_DATA = (1 << 17), //wait data to read.
+ SOCK_NO_SPACE = (1 << 18), //no space to write.
+};
+
+#define SOCK_NOT_CONNECTED 1
+//For PID/Progrma Name
+#define PROGRAM_NAME "PID/Program Name"
+#define PROGNAME_LEN 21
+
+typedef struct _pidlist {
+ struct _pidlist *next;
+ long inode;
+ char name[PROGNAME_LEN];
+} PID_LIST;
+PID_LIST *pid_list = NULL;
+
+/*
+ * Get base name from the input name.
+ */
+static const char *get_basename(char *name)
+{
+ const char *c = strrchr(name, '/');
+ if (c) return c + 1;
+ return name;
+}
+/*
+ * copy string from src to dest -> only number of bytes.
+ */
+static char *safe_strncpy(char *dst, char *src, size_t size)
+{
+ if(!size) return dst;
+ dst[--size] = '\0';
+ return strncpy(dst, src, size);
+}
+
+/*
+ * locate character in string.
+ */
+static char *strchr_nul(char *s, int c)
+{
+ while(*s != '\0' && *s != c) s++;
+ return (char*)s;
+}
+
+// Find out if the last character of a string matches with the given one.
+// Don't underrun the buffer if the string length is 0.
+static char *find_last_char(char *str, int c)
+{
+ if (str && *str) {
+ size_t sz = strlen(str) - 1;
+ str += sz;
+ if ( (unsigned char)*str == c) return (char*)str;
+ }
+ return NULL;
+}
+/*
+ * Concat path and the file name.
+ */
+static char *append_pathandfile(char *path, char *fname)
+{
+ char *c;
+ if (!path) path = "";
+ c = find_last_char(path, '/');
+ while (*fname == '/') fname++;
+ return xmsprintf("%s%s%s", path, (c)? "" : "/", fname);
+}
+/*
+ * Concat sub-path and the file name.
+ */
+static char *append_subpathandfile(char *path, char *fname)
+{
+#define ISDOTORDOTDOT(s) ((s)[0] == '.' && (!(s)[1] || ((s)[1] == '.' && !(s)[2])))
+ if(!fname) return NULL;
+ if(ISDOTORDOTDOT(fname)) return NULL;
+ return append_pathandfile(path, fname);
+#undef ISDOTORDOTDOT
+}
+/*
+ * used to converts string into int and validate the input str for invalid int value or out-of-range.
+ */
+static unsigned get_strtou(char *str, char **endp, int base)
+{
+ unsigned long uli;
+ char *endptr;
+
+ if (!isalnum(str[0])) {
+ errno = ERANGE;
+ return UINT_MAX;
+ }
+ errno = 0;
+ uli = strtoul(str, &endptr, base);
+ if (uli > UINT_MAX) {
+ errno = ERANGE;
+ return UINT_MAX;
+ }
+
+ if (endp) *endp = endptr;
+ if (endptr[0]) {
+ if (isalnum(endptr[0]) || errno) { //"123abc" or out-of-range
+ errno = ERANGE;
+ return UINT_MAX;
+ }
+ errno = EINVAL;
+ }
+ return uli;
+}
+/*
+ * used to retrive pid name from pid list.
+ */
+static const char *get_pid_name(unsigned long inode)
+{
+ PID_LIST *tmp;
+ for (tmp = pid_list; tmp; tmp = tmp->next)
+ if (tmp->inode == inode) return tmp->name;
+ return "-";
+}
+/*
+ * For TCP/UDP/RAW display data.
+ */
+static void display_data(unsigned rport, char *label, unsigned rxq, unsigned txq, char *lip, char *rip, unsigned state, unsigned long inode)
+{
+ char *ss_state = "UNKNOWN";
+ char *state_label[] = {"", "ESTABLISHED", "SYN_SENT", "SYN_RECV", "FIN_WAIT1", "FIN_WAIT2",
+ "TIME_WAIT", "CLOSE", "CLOSE_WAIT", "LAST_ACK", "LISTEN", "CLOSING", "UNKNOWN"};
+ if (!strcmp(label, "tcp")) {
+ int sz = ARRAY_LEN(state_label);
+ if (!state || state >= sz) state = sz-1;
+ ss_state = state_label[state];
+ }
+ else if (!strcmp(label, "udp")) {
+ if (state == 1) ss_state = state_label[state];
+ else if (state == 7) ss_state = "";
+ }
+ else if (!strcmp(label, "raw")) ss_state = itoa(state);
+
+ if ( (toys.optflags & FLAG_W) && (toys.optflags & FLAG_p))
+ xprintf("%3s %6d %6d %-51s %-51s %-12s%s\n", label, rxq, txq, lip, rip, ss_state, get_pid_name(inode));
+ else if (toys.optflags & FLAG_W)
+ xprintf("%3s %6d %6d %-51s %-51s %-12s\n", label, rxq, txq, lip, rip, ss_state);
+ else if (toys.optflags & FLAG_p)
+ xprintf("%3s %6d %6d %-23s %-23s %-12s%s\n", label, rxq, txq, lip, rip, ss_state, get_pid_name(inode));
+ else xprintf("%3s %6d %6d %-23s %-23s %-12s\n", label, rxq, txq, lip, rip, ss_state);
+}
+/*
+ * For TCP/UDP/RAW show data.
+ */
+static void show_data(unsigned rport, char *label, unsigned rxq, unsigned txq, char *lip, char *rip, unsigned state, unsigned long inode)
+{
+ if (toys.optflags & FLAG_l) {
+ if (!rport && (state && 0xA)) display_data(rport, label, rxq, txq, lip, rip, state, inode);
+ } else if (toys.optflags & FLAG_a) display_data(rport, label, rxq, txq, lip, rip, state, inode);
+ //rport && (TCP | UDP | RAW)
+ else if (rport && (0x10 | 0x20 | 0x40)) display_data(rport, label, rxq, txq, lip, rip, state, inode);
+}
+/*
+ * used to get service name.
+ */
+static char *get_servname(int port, char *label)
+{
+ int lport = htons(port);
+ if (!lport) return xmsprintf("%s", "*");
+ struct servent *ser = getservbyport(lport, label);
+ if (ser) return xmsprintf("%s", ser->s_name);
+ return xmsprintf("%s", itoa(ntohs(lport)));
+}
+/*
+ * used to convert address into text format.
+ */
+static void addr2str(int af, void *addr, unsigned port, char *buf, char *label)
+{
+ char ip[ADDR_LEN] = {0,};
+ if (!inet_ntop(af, addr, ip, ADDR_LEN)) {
+ *buf = '\0';
+ return;
+ }
+ size_t iplen = strlen(ip);
+ if (!port) {
+ strncat(ip+iplen, ":*", ADDR_LEN-iplen-1);
+ memcpy(buf, ip, ADDR_LEN);
+ return;
+ }
+
+ if (!(toys.optflags & FLAG_n)) {
+ struct addrinfo hints, *result, *rp;
+
+ memset(&hints, 0, sizeof(struct addrinfo));
+ hints.ai_family = af;
+
+ if (!getaddrinfo(ip, NULL, &hints, &result)) {
+ char hbuf[NI_MAXHOST] = {0,}, sbuf[NI_MAXSERV] = {0,};
+ socklen_t sock_len;
+ char *sname = NULL;
+ int plen = 0;
+
+ if (af == AF_INET) sock_len = sizeof(struct sockaddr_in);
+ else sock_len = sizeof(struct sockaddr_in6);
+
+ for (rp = result; rp; rp = rp->ai_next)
+ if (!getnameinfo(rp->ai_addr, sock_len, hbuf, sizeof(hbuf), sbuf, sizeof(sbuf), NI_NUMERICSERV))
+ break;
+
+ freeaddrinfo(result);
+ sname = get_servname(port, label);
+ plen = strlen(sname);
+ if (*hbuf) {
+ memset(ip, 0, ADDR_LEN);
+ memcpy(ip, hbuf, (ADDR_LEN - plen - 2));
+ iplen = strlen(ip);
+ }
+ snprintf(ip + iplen, ADDR_LEN-iplen, ":%s", sname);
+ free(sname);
+ }
+ }
+ else snprintf(ip+iplen, ADDR_LEN-iplen, ":%d", port);
+ memcpy(buf, ip, ADDR_LEN);
+}
+/*
+ * display ipv4 info for TCP/UDP/RAW.
+ */
+static void show_ipv4(char *fname, char *label)
+{
+ FILE *fp = fopen((char *)fname, "r");
+ if (!fp) {
+ perror_msg("'%s'", fname);
+ return;
+ }
+ fgets(toybuf, sizeof(toybuf), fp); //skip header.
+ while (fgets(toybuf, sizeof(toybuf), fp)) {
+ char lip[ADDR_LEN] = {0,}, rip[ADDR_LEN] = {0,};
+ iaddr laddr, raddr;
+ unsigned lport, rport, state, txq, rxq, num, uid;
+ unsigned long inode;
+
+ int nitems = sscanf(toybuf, " %d: %x:%x %x:%x %x %x:%x %*X:%*X %*X %d %*d %ld",
+ &num, &laddr.u, &lport, &raddr.u, &rport, &state, &txq, &rxq, &uid, &inode);
+ if (nitems == 10) {
+ addr2str(AF_INET, &laddr, lport, lip, label);
+ addr2str(AF_INET, &raddr, rport, rip, label);
+ show_data(rport, label, rxq, txq, lip, rip, state, inode);
+ }
+ }//End of While
+ fclose(fp);
+}
+/*
+ * display ipv6 info for TCP/UDP/RAW.
+ */
+static void show_ipv6(char *fname, char *label)
+{
+ FILE *fp = fopen((char *)fname, "r");
+ if (!fp) {
+ perror_msg("'%s'", fname);
+ return;
+ }
+ fgets(toybuf, sizeof(toybuf), fp); //skip header.
+ while (fgets(toybuf, sizeof(toybuf), fp)) {
+ char lip[ADDR_LEN] = {0,}, rip[ADDR_LEN] = {0,};
+ iaddr6 laddr6, raddr6;
+ unsigned lport, rport, state, txq, rxq, num, uid;
+ unsigned long inode;
+ int nitems = sscanf(toybuf, " %d: %8x%8x%8x%8x:%x %8x%8x%8x%8x:%x %x %x:%x %*X:%*X %*X %d %*d %ld",
+ &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, &uid, &inode);
+ if (nitems == 16) {
+ addr2str(AF_INET6, &laddr6, lport, lip, label);
+ addr2str(AF_INET6, &raddr6, rport, rip, label);
+ show_data(rport, label, rxq, txq, lip, rip, state, inode);
+ }
+ }//End of While
+ fclose(fp);
+}
+/*
+ * display unix socket info.
+ */
+static void show_unix_sockets(char *fname, char *label)
+{
+ FILE *fp = fopen((char *)fname, "r");
+ if (!fp) {
+ perror_msg("'%s'", fname);
+ return;
+ }
+ fgets(toybuf, sizeof(toybuf), fp); //skip header.
+ while (fgets(toybuf, sizeof(toybuf), fp)) {
+ unsigned long int refcount, label, flags, inode;
+ int nitems = 0, path_offset = 0, type, state;
+ char sock_flags[32] = {0,}, *sock_type, *sock_state, *bptr = toybuf;
+
+ if (!toybuf[0]) continue;
+ nitems = sscanf(toybuf, "%*p: %lX %lX %lX %X %X %lu %n",
+ &refcount, &label, &flags, &type, &state, &inode, &path_offset);
+ //for state one less
+ if (nitems < 6) break;
+ if (toys.optflags & FLAG_l) {
+ if ( !((state == SOCK_NOT_CONNECTED) && (flags & SOCK_ACCEPTCON)) ) continue;
+ } else if (!(toys.optflags & FLAG_a)) {
+ if ((state == SOCK_NOT_CONNECTED) && (flags & SOCK_ACCEPTCON)) continue;
+ }
+
+ //prepare socket type, state and flags.
+ {
+ char *ss_type[] = { "", "STREAM", "DGRAM", "RAW", "RDM", "SEQPACKET", "UNKNOWN"};
+ char *ss_state[] = { "FREE", "LISTENING", "CONNECTING", "CONNECTED", "DISCONNECTING", "UNKNOWN"};
+
+ int sz = ARRAY_LEN(ss_type);//sizeof(ss_type)/sizeof(ss_type[0]);
+ if ( (type < SOCK_STREAM) || (type > SOCK_SEQPACKET) ) sock_type = ss_type[sz-1];
+ else sock_type = ss_type[type];
+
+ sz = ARRAY_LEN(ss_state);//sizeof(ss_state)/sizeof(ss_state[0]);
+ if ((state < 0) || (state > sz-2)) sock_state = ss_state[sz-1];
+ else if (state == SOCK_NOT_CONNECTED) {
+ if (flags & SOCK_ACCEPTCON) sock_state = ss_state[state];
+ else sock_state = " ";
+ } else sock_state = ss_state[state];
+
+ strcpy(sock_flags, "[ ");
+ if (flags & SOCK_ACCEPTCON) strcat(sock_flags, "ACC ");
+ if (flags & SOCK_WAIT_DATA) strcat(sock_flags, "W ");
+ if (flags & SOCK_NO_SPACE) strcat(sock_flags, "N ");
+ strcat(sock_flags, "]");
+ }
+ xprintf("%-5s %-6ld %-11s %-10s %-13s %6lu ", (!label ? "unix" : "??"), refcount, sock_flags, sock_type, sock_state, inode);
+ if (toys.optflags & FLAG_p) xprintf("%-20s", get_pid_name(inode));
+
+ bptr += path_offset;
+ *strchr_nul(bptr, '\n') = '\0';
+ xprintf("%s\n", bptr);
+ }//End of while
+ fclose(fp);
+}
+/*
+ * extract inode value from the link.
+ */
+static long ss_inode(char *link)
+{
+ long inode = -1;
+ //"link = socket:[12345]", get "12345" as inode.
+ if (!strncmp(link, "socket:[", sizeof("socket:[")-1)) {
+ inode = get_strtou(link + sizeof("socket:[")-1, (char**)&link, 0);
+ if (*link != ']') inode = -1;
+ }
+ //"link = [0000]:12345", get "12345" as inode.
+ else if (!strncmp(link, "[0000]:", sizeof("[0000]:")-1)) {
+ inode = get_strtou(link + sizeof("[0000]:")-1, NULL, 0);
+ //if not NULL terminated.
+ if (errno) inode = -1;
+ }
+ return inode;
+}
+/*
+ * add inode and progname in the pid list.
+ */
+static void add2list(long inode, char *progname)
+{
+ PID_LIST *node = pid_list;
+ for(; node; node = node->next) {
+ if(node->inode == inode)
+ return;
+ }
+ PID_LIST *new = (PID_LIST *)xzalloc(sizeof(PID_LIST));
+ new->inode = inode;
+ safe_strncpy(new->name, progname, PROGNAME_LEN-1);
+ new->next = pid_list;
+ pid_list = new;
+}
+/*
+ * add pid info in the list.
+ */
+static void extract_inode(char *path, char *progname)
+{
+ DIR *dp;
+ struct dirent *entry;
+
+ if (!(dp = opendir(path))) {
+ if (errno == EACCES) return;
+ else perror_exit("%s", path);
+ }
+ while ((entry = readdir(dp))) {
+ char *link = NULL, *fname = append_subpathandfile(path, entry->d_name);
+ if (!fname) continue;
+ link = xreadlink(fname);
+ if (link) {
+ long inode = ss_inode(link);
+ free(link);
+ if (inode != -1) add2list(inode, progname);
+ }
+ free(fname);
+ }//end of while.
+ closedir(dp);
+}
+/*
+ * prepare the list for all pids in /proc directory.
+ */
+static void get_pid_list(void)
+{
+ DIR *dp;
+ struct dirent *entry;
+ char path[64] = {0,};
+ uid_t uid = geteuid();
+
+ if (!(dp = opendir("/proc"))) perror_exit("opendir");
+
+ while ((entry = readdir(dp))) {
+ int fd, nitems = 0, length = 0;
+ char *pid, *progname;
+
+ if (!isdigit(*entry->d_name)) continue;
+ pid = entry->d_name;
+ length = snprintf(path, sizeof(path), "/proc/%s/cmdline", entry->d_name);
+ if (sizeof(path) <= length) continue;
+
+ fd = xopen(path, O_RDONLY);
+ nitems = readall(fd, toybuf, sizeof(toybuf) - 1);
+ xclose(fd);
+ if (nitems < 1) continue;
+ toybuf[nitems] = '\0';
+ strcpy(path + length - (sizeof("cmdline")-1), "fd");
+ progname = append_pathandfile(pid, (char *)get_basename(toybuf)); //e.g. progname = 2054/gnome-keyring-daemon
+ extract_inode(path, progname);
+ }//end of while.
+ closedir(dp);
+
+ if (uid) fprintf(stderr, "(Not all processes could be identified, non-owned process info "
+ "will not be shown, you would have to be root to see it all.)\n");
+}
+/*
+ * Dealloc pid list.
+ */
+static void clean_pid_list(void)
+{
+ PID_LIST *tmp;
+ while (pid_list) {
+ tmp = pid_list->next;
+ free(pid_list);
+ pid_list = tmp;
+ }
+}
+/*
+ * For TCP/UDP/RAW show the header.
+ */
+static void show_header(void)
+{
+ if ((toys.optflags & FLAG_W) && (toys.optflags & FLAG_p))
+ xprintf("\nProto Recv-Q Send-Q %-51s %-51s %-12s%s\n", "Local Address", "Foreign Address", "State", PROGRAM_NAME);
+ else if (toys.optflags & FLAG_p)
+ xprintf("\nProto Recv-Q Send-Q %-23s %-23s %-12s%s\n", "Local Address", "Foreign Address", "State", PROGRAM_NAME);
+ else if (toys.optflags & FLAG_W)
+ xprintf("\nProto Recv-Q Send-Q %-51s %-51s State \n", "Local Address", "Foreign Address");
+ else xprintf("\nProto Recv-Q Send-Q %-23s %-23s State \n", "Local Address", "Foreign Address");
+}
+/*
+ * used to get the flag values for route command.
+ */
+static void get_flag_value(char **flagstr, int flags)
+{
+ int i = 0;
+ char *str = *flagstr;
+ static const char flagchars[] = "GHRDMDAC";
+ static const unsigned flagarray[] = {
+ RTF_GATEWAY,
+ RTF_HOST,
+ RTF_REINSTATE,
+ RTF_DYNAMIC,
+ RTF_MODIFIED,
+ RTF_DEFAULT,
+ RTF_ADDRCONF,
+ RTF_CACHE
+ };
+ *str++ = 'U';
+ while ( (*str = flagchars[i]) ) {
+ if (flags & flagarray[i++]) ++str;
+ }
+}
+/*
+ * extract inet4 route info from /proc/net/route file and display it.
+ */
+static void display_routes(int is_more_info, int notresolve)
+{
+#define IPV4_MASK (RTF_GATEWAY|RTF_HOST|RTF_REINSTATE|RTF_DYNAMIC|RTF_MODIFIED)
+ unsigned long dest, gate, mask;
+ int flags, ref, use, metric, mss, win, irtt;
+ char iface[64]={0,};
+ char *flag_val = xzalloc(10); //there are 9 flags "UGHRDMDAC" for route.
+
+ FILE *fp = xfopen("/proc/net/route", "r");
+ xprintf("Kernel IP routing table\n"
+ "Destination Gateway Genmask Flags %s Iface\n",
+ is_more_info ? " MSS Window irtt" : "Metric Ref Use");
+ fgets(toybuf, sizeof(toybuf), fp); //skip 1st line.
+ while (fgets(toybuf, sizeof(toybuf), fp)) {
+ int nitems = 0;
+ char *destip = NULL, *gateip = NULL, *maskip = NULL;
+ memset(flag_val, 0, 10);
+
+ nitems = sscanf(toybuf, "%63s%lx%lx%X%d%d%d%lx%d%d%d\n",
+ iface, &dest, &gate, &flags, &ref, &use, &metric, &mask, &mss, &win, &irtt);
+ if (nitems != 11) {//EOF with no (nonspace) chars read.
+ if ((nitems < 0) && feof(fp)) break;
+ perror_exit("sscanf");
+ }
+ //skip down interfaces.
+ if (!(flags & RTF_UP)) continue;
+
+ if (dest) {//For Destination
+ if (inet_ntop(AF_INET, &dest, toybuf, sizeof(toybuf)) ) destip = xstrdup(toybuf);
+ } else {
+ if (!notresolve) destip = xstrdup("default");
+ else destip = xstrdup("0.0.0.0");
+ }
+ if (gate) {//For Gateway
+ if (inet_ntop(AF_INET, &gate, toybuf, sizeof(toybuf)) ) gateip = xstrdup(toybuf);
+ } else {
+ if (!notresolve) gateip = xstrdup("*");
+ else gateip = xstrdup("0.0.0.0");
+ }
+ //For Mask
+ if (inet_ntop(AF_INET, &mask, toybuf, sizeof(toybuf)) ) maskip = xstrdup(toybuf);
+
+ //Get flag Values
+ get_flag_value(&flag_val, (flags & IPV4_MASK));
+ if (flags & RTF_REJECT) flag_val[0] = '!';
+ xprintf("%-15.15s %-15.15s %-16s%-6s", destip, gateip, maskip, flag_val);
+ if (destip) free(destip);
+ if (gateip) free(gateip);
+ if (maskip) free(maskip);
+ if (is_more_info) xprintf("%5d %-5d %6d %s\n", mss, win, irtt, iface);
+ else xprintf("%-6d %-2d %7d %s\n", metric, ref, use, iface);
+ }//end of while.
+ fclose(fp);
+ if (flag_val) free(flag_val);
+#undef IPV4_MASK
+ return;
+}
+/*
+ * netstat utily main function.
+ */
+void netstat_main(void)
+{
+#define IS_NETSTAT_PROTO_FLAGS_UP (toys.optflags & (FLAG_t | FLAG_u | FLAG_w | FLAG_x))
+ int flag_listen_and_all = 0;
+ if (!toys.optflags) toys.optflags = FLAG_t | FLAG_u | FLAG_w | FLAG_x;
+
+ //When a is set
+ if (toys.optflags & FLAG_a) flag_listen_and_all = 1;
+ //when a and l both are set
+ if ( (toys.optflags & FLAG_a) && (toys.optflags & FLAG_l) )
+ toys.optflags &= ~FLAG_l;
+ //when only a is set
+ if ( (toys.optflags & FLAG_a) && (!IS_NETSTAT_PROTO_FLAGS_UP) )
+ toys.optflags |= FLAG_t | FLAG_u | FLAG_w | FLAG_x;
+ //when only l is set
+ if ( (toys.optflags & FLAG_l) && (!IS_NETSTAT_PROTO_FLAGS_UP) )
+ toys.optflags |= FLAG_t | FLAG_u | FLAG_w | FLAG_x;
+ //when only e/n is set
+ if( ((toys.optflags & FLAG_e) || (toys.optflags & FLAG_n)) && (!IS_NETSTAT_PROTO_FLAGS_UP) )
+ toys.optflags |= FLAG_t | FLAG_u | FLAG_w | FLAG_x;
+ //when W is set
+ if ( (toys.optflags & FLAG_W) && (!IS_NETSTAT_PROTO_FLAGS_UP) )
+ toys.optflags |= FLAG_t | FLAG_u | FLAG_w | FLAG_x;
+ //when p is set
+ if ( (toys.optflags & FLAG_p) && (!IS_NETSTAT_PROTO_FLAGS_UP) )
+ toys.optflags |= FLAG_t | FLAG_u | FLAG_w | FLAG_x;
+
+ //Display routing table.
+ if (toys.optflags & FLAG_r) {
+ display_routes(!(toys.optflags & FLAG_e), (toys.optflags & FLAG_n));
+ return;
+ }
+
+ if (toys.optflags & FLAG_p) get_pid_list();
+
+ //For TCP/UDP/RAW.
+ if ( (toys.optflags & FLAG_t) || (toys.optflags & FLAG_u) || (toys.optflags & FLAG_w) ) {
+ xprintf("Active Internet connections ");
+
+ if (flag_listen_and_all) xprintf("(servers and established)");
+ else if (toys.optflags & FLAG_l) xprintf("(only servers)");
+ else xprintf("(w/o servers)");
+
+ show_header();
+ if (toys.optflags & FLAG_t) {//For TCP
+ show_ipv4("/proc/net/tcp", "tcp");
+ show_ipv6("/proc/net/tcp6", "tcp");
+ }
+ if (toys.optflags & FLAG_u) {//For UDP
+ show_ipv4("/proc/net/udp", "udp");
+ show_ipv6("/proc/net/udp6", "udp");
+ }
+ if (toys.optflags & FLAG_w) {//For raw
+ show_ipv4("/proc/net/raw", "raw");
+ show_ipv6("/proc/net/raw6", "raw");
+ }
+ }
+ if (toys.optflags & FLAG_x) {//For UNIX.
+ xprintf("Active UNIX domain sockets ");
+ if (flag_listen_and_all) xprintf("(servers and established)");
+ else if (toys.optflags & FLAG_l) xprintf("(only servers)");
+ else xprintf("(w/o servers)");
+
+ if (toys.optflags & FLAG_p) xprintf("\nProto RefCnt Flags Type State I-Node %s Path\n", PROGRAM_NAME);
+ else xprintf("\nProto RefCnt Flags Type State I-Node Path\n");
+ show_unix_sockets("/proc/net/unix", "unix");
+ }
+ if (toys.optflags & FLAG_p) clean_pid_list();
+ if (toys.exitval) toys.exitval = 0;
+#undef IS_NETSTAT_PROTO_FLAGS_UP
+}