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-rw-r--r--toys/net/netstat.c383
1 files changed, 383 insertions, 0 deletions
diff --git a/toys/net/netstat.c b/toys/net/netstat.c
new file mode 100644
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--- /dev/null
+++ b/toys/net/netstat.c
@@ -0,0 +1,383 @@
+/* netstat.c - Display Linux networking subsystem.
+ *
+ * Copyright 2012 Ranjan Kumar <ranjankumar.bth@gmail.com>
+ * Copyright 2013 Kyungwan Han <asura321@gmail.com>
+ *
+ * Not in SUSv4.
+ *
+USE_NETSTAT(NEWTOY(netstat, "pWrxwutneal", TOYFLAG_BIN))
+config NETSTAT
+ bool "netstat"
+ default y
+ help
+ usage: netstat [-pWrxwutneal]
+
+ Display networking information. Default is netsat -tuwx
+
+ -r routing table
+ -a all sockets (not just connected)
+ -l listening server sockets
+ -t TCP sockets
+ -u UDP sockets
+ -w raw sockets
+ -x unix sockets
+ -e extended info
+ -n don't resolve names
+ -W wide display
+ -p PID/Program name of sockets
+*/
+
+#define FOR_netstat
+#include "toys.h"
+#include <net/route.h>
+
+GLOBALS(
+ struct num_cache *inodes;
+ int wpad;
+);
+
+// convert address into text format.
+static void addr2str(int af, void *addr, unsigned port, char *buf, int len,
+ char *proto)
+{
+ int pos, count;
+ struct servent *ser = 0;
+
+ // Convert to numeric address
+ if (!inet_ntop(af, addr, buf, 256)) {
+ *buf = 0;
+
+ return;
+ }
+ buf[len] = 0;
+ pos = strlen(buf);
+
+ // If there's no port number, it's a local :* binding, nothing to look up.
+ if (!port) {
+ if (len-pos<2) pos = len-2;
+ strcpy(buf+pos, ":*");
+
+ return;
+ }
+
+ if (!(toys.optflags & FLAG_n)) {
+ struct addrinfo hints, *result, *rp;
+ char cut[4];
+
+ memset(&hints, 0, sizeof(struct addrinfo));
+ hints.ai_family = af;
+
+ if (!getaddrinfo(buf, NULL, &hints, &result)) {
+ socklen_t sock_len = (af == AF_INET) ? sizeof(struct sockaddr_in)
+ : sizeof(struct sockaddr_in6);
+
+ // We assume that a failing getnameinfo dosn't stomp "buf" here.
+ for (rp = result; rp; rp = rp->ai_next)
+ if (!getnameinfo(rp->ai_addr, sock_len, buf, 256, 0, 0, 0)) break;
+ freeaddrinfo(result);
+ buf[len] = 0;
+ pos = strlen(buf);
+ }
+
+ // Doesn't understand proto "tcp6", so truncate
+ memcpy(cut, proto, 3);
+ cut[3] = 0;
+ ser = getservbyport(htons(port), cut);
+ }
+
+ // Append :service
+ count = snprintf(0, 0, ":%u", port);
+ if (ser) {
+ count = snprintf(0, 0, ":%s", ser->s_name);
+ // sheer paranoia
+ if (count>=len) {
+ count = len-1;
+ ser->s_name[count] = 0;
+ }
+ }
+ if (len-pos<count) pos = len-count;
+ if (ser) sprintf(buf+pos, ":%s", ser->s_name);
+ else sprintf(buf+pos, ":%u", port);
+}
+
+// Display info for tcp/udp/raw
+static void show_ip(char *fname)
+{
+ char *ss_state = "UNKNOWN", buf[12], *s, *label = strrchr(fname, '/')+1;
+ char *state_label[] = {"", "ESTABLISHED", "SYN_SENT", "SYN_RECV", "FIN_WAIT1",
+ "FIN_WAIT2", "TIME_WAIT", "CLOSE", "CLOSE_WAIT",
+ "LAST_ACK", "LISTEN", "CLOSING", "UNKNOWN"};
+ struct passwd *pw;
+ FILE *fp = fopen(fname, "r");
+
+ if (!fp) {
+ perror_msg("'%s'", fname);
+ return;
+ }
+
+ if(!fgets(toybuf, sizeof(toybuf), fp)) return; //skip header.
+
+ while (fgets(toybuf, sizeof(toybuf), fp)) {
+ char lip[256], rip[256];
+ union {
+ struct {unsigned u; unsigned char b[4];} i4;
+ struct {struct {unsigned a, b, c, d;} u; unsigned char b[16];} i6;
+ } laddr, raddr;
+ unsigned lport, rport, state, txq, rxq, num, uid, nitems;
+ unsigned long inode;
+
+ // Try ipv6, then try ipv4
+ nitems = sscanf(toybuf,
+ " %d: %8x%8x%8x%8x:%x %8x%8x%8x%8x:%x %x %x:%x %*X:%*X %*X %d %*d %ld",
+ &num, &laddr.i6.u.a, &laddr.i6.u.b, &laddr.i6.u.c,
+ &laddr.i6.u.d, &lport, &raddr.i6.u.a, &raddr.i6.u.b,
+ &raddr.i6.u.c, &raddr.i6.u.d, &rport, &state, &txq, &rxq,
+ &uid, &inode);
+
+ if (nitems!=16) {
+ nitems = sscanf(toybuf,
+ " %d: %x:%x %x:%x %x %x:%x %*X:%*X %*X %d %*d %ld",
+ &num, &laddr.i4.u, &lport, &raddr.i4.u, &rport, &state, &txq,
+ &rxq, &uid, &inode);
+
+ if (nitems!=10) continue;
+ nitems = AF_INET;
+ } else nitems = AF_INET6;
+
+ // Should we display this? (listening or all or TCP/UDP/RAW)
+ if (!((toys.optflags & FLAG_l) && (!rport && (state & 0xA)))
+ && !(toys.optflags & FLAG_a) && !(rport & (0x10 | 0x20 | 0x40)))
+ continue;
+
+ addr2str(nitems, &laddr, lport, lip, TT.wpad, label);
+ addr2str(nitems, &raddr, rport, rip, TT.wpad, label);
+
+ // Display data
+ s = label;
+ if (strstart(&s, "tcp")) {
+ int sz = ARRAY_LEN(state_label);
+ if (!state || state >= sz) state = sz-1;
+ ss_state = state_label[state];
+ } else if (strstart(&s, "udp")) {
+ if (state == 1) ss_state = state_label[state];
+ else if (state == 7) ss_state = "";
+ } else if (strstart(&s, "raw")) sprintf(ss_state = buf, "%u", state);
+
+ if (!(toys.optflags & FLAG_n) && (pw = bufgetpwuid(uid)))
+ snprintf(toybuf, sizeof(toybuf), "%s", pw->pw_name);
+ else snprintf(toybuf, sizeof(toybuf), "%d", uid);
+
+ printf("%-6s%6d%7d ", label, rxq, txq);
+ printf("%*.*s %*.*s ", -TT.wpad, TT.wpad, lip, -TT.wpad, TT.wpad, rip);
+ printf("%-11s", ss_state);
+ if ((toys.optflags & FLAG_e)) printf(" %-10s %-11ld", toybuf, inode);
+ if ((toys.optflags & FLAG_p)) {
+ struct num_cache *nc = get_num_cache(TT.inodes, inode);
+
+ printf(" %s", nc ? nc->data : "-");
+ }
+ xputc('\n');
+ }
+ fclose(fp);
+}
+
+static void show_unix_sockets(void)
+{
+ char *types[] = {"","STREAM","DGRAM","RAW","RDM","SEQPACKET","DCCP","PACKET"},
+ *states[] = {"","LISTENING","CONNECTING","CONNECTED","DISCONNECTING"},
+ *s, *ss;
+ unsigned long refcount, flags, type, state, inode;
+ FILE *fp = xfopen("/proc/net/unix", "r");
+
+ if(!fgets(toybuf, sizeof(toybuf), fp)) return; //skip header.
+
+ while (fgets(toybuf, sizeof(toybuf), fp)) {
+ unsigned offset = 0;
+
+ // count = 6 or 7 (first field ignored, sockets don't always have filenames)
+ if (6<sscanf(toybuf, "%*p: %lX %*X %lX %lX %lX %lu %n",
+ &refcount, &flags, &type, &state, &inode, &offset))
+ continue;
+
+ // Linux exports only SO_ACCEPTCON since 2.3.15pre3 in 1999, but let's
+ // filter in case they add more someday.
+ flags &= 1<<16;
+
+ // Only show unconnected listening sockets with -a
+ if (state==1 && flags && !(toys.optflags&FLAG_a)) continue;
+
+ if (type==10) type = 7; // move SOCK_PACKET into line
+ if (type>ARRAY_LEN(types)) type = 0;
+ if (state>ARRAY_LEN(states) || (state==1 && !flags)) state = 0;
+ sprintf(toybuf, "[ %s]", flags ? "ACC " : "");
+
+ printf("unix %-6ld %-11s %-10s %-13s %8lu ",
+ refcount, toybuf, types[type], states[state], inode);
+ if (toys.optflags & FLAG_p) {
+ struct num_cache *nc = get_num_cache(TT.inodes, inode);
+
+ printf("%-19.19s", nc ? nc->data : "-");
+ }
+
+ if (offset) {
+ if ((ss = strrchr(s = toybuf+offset, '\n'))) *ss = 0;
+ printf("%s", s);
+ }
+ xputc('\n');
+ }
+
+ fclose(fp);
+}
+
+static int scan_pids(struct dirtree *node)
+{
+ char *s = toybuf+256;
+ struct dirent *entry;
+ DIR *dp;
+ int pid, dirfd;
+
+ if (!node->parent) return DIRTREE_RECURSE;
+ if (!(pid = atol(node->name))) return 0;
+
+ sprintf(toybuf, "/proc/%d/cmdline", pid);
+ if (!(readfile(toybuf, toybuf, 256))) return 0;
+
+ sprintf(s, "%d/fd", pid);
+ if (-1==(dirfd = openat(dirtree_parentfd(node), s, O_RDONLY))) return 0;
+ if (!(dp = fdopendir(dirfd))) {
+ close(dirfd);
+
+ return 0;
+ }
+
+ while ((entry = readdir(dp))) {
+ s = toybuf+256;
+ if (!readlinkat0(dirfd, entry->d_name, s, sizeof(toybuf)-256)) continue;
+ // Can the "[0000]:" happen in a modern kernel?
+ if (strstart(&s, "socket:[") || strstart(&s, "[0000]:")) {
+ long long ll = atoll(s);
+
+ sprintf(s, "%d/%s", pid, getbasename(toybuf));
+ add_num_cache(&TT.inodes, ll, s, strlen(s)+1);
+ }
+ }
+ closedir(dp);
+
+ return 0;
+}
+
+/*
+ * extract inet4 route info from /proc/net/route file and display it.
+ */
+static void display_routes(void)
+{
+ static const char flagchars[] = "GHRDMDAC";
+ static const unsigned flagarray[] = {
+ RTF_GATEWAY, RTF_HOST, RTF_REINSTATE, RTF_DYNAMIC, RTF_MODIFIED
+ };
+ unsigned long dest, gate, mask;
+ int flags, ref, use, metric, mss, win, irtt;
+ char *out = toybuf, *flag_val;
+ char iface[64]={0};
+ FILE *fp = xfopen("/proc/net/route", "r");
+
+ if(!fgets(toybuf, sizeof(toybuf), fp)) return; //skip header.
+
+ printf("Kernel IP routing table\n"
+ "Destination\tGateway \tGenmask \tFlags %s Iface\n",
+ !(toys.optflags&FLAG_e) ? " MSS Window irtt" : "Metric Ref Use");
+
+ while (fgets(toybuf, sizeof(toybuf), fp)) {
+ char *destip = 0, *gateip = 0, *maskip = 0;
+
+ if (11 != sscanf(toybuf, "%63s%lx%lx%X%d%d%d%lx%d%d%d", iface, &dest,
+ &gate, &flags, &ref, &use, &metric, &mask, &mss, &win, &irtt))
+ break;
+
+ // skip down interfaces.
+ if (!(flags & RTF_UP)) continue;
+
+// TODO /proc/net/ipv6_route
+
+ if (dest) {
+ if (inet_ntop(AF_INET, &dest, out, 16)) destip = out;
+ } else destip = (toys.optflags&FLAG_n) ? "0.0.0.0" : "default";
+ out += 16;
+
+ if (gate) {
+ if (inet_ntop(AF_INET, &gate, out, 16)) gateip = out;
+ } else gateip = (toys.optflags&FLAG_n) ? "0.0.0.0" : "*";
+ out += 16;
+
+// TODO /24
+ //For Mask
+ if (inet_ntop(AF_INET, &mask, out, 16)) maskip = out;
+ else maskip = "?";
+ out += 16;
+
+ //Get flag Values
+ flag_val = out;
+ *out++ = 'U';
+ for (dest = 0; dest < ARRAY_LEN(flagarray); dest++)
+ if (flags&flagarray[dest]) *out++ = flagchars[dest];
+ *out = 0;
+ if (flags & RTF_REJECT) *flag_val = '!';
+
+ printf("%-15.15s %-15.15s %-16s%-6s", destip, gateip, maskip, flag_val);
+ if (!(toys.optflags & FLAG_e))
+ printf("%5d %-5d %6d %s\n", mss, win, irtt, iface);
+ else printf("%-6d %-2d %7d %s\n", metric, ref, use, iface);
+ }
+
+ fclose(fp);
+}
+
+void netstat_main(void)
+{
+ int tuwx = FLAG_t|FLAG_u|FLAG_w|FLAG_x;
+ char *type = "w/o";
+
+ TT.wpad = (toys.optflags&FLAG_W) ? 51 : 23;
+ if (!(toys.optflags&(FLAG_r|tuwx))) toys.optflags |= tuwx;
+ if (toys.optflags & FLAG_r) display_routes();
+ if (!(toys.optflags&tuwx)) return;
+
+ if (toys.optflags & FLAG_a) type = "established and";
+ else if (toys.optflags & FLAG_l) type = "only";
+
+ if (toys.optflags & FLAG_p) dirtree_read("/proc", scan_pids);
+
+ if (toys.optflags&(FLAG_t|FLAG_u|FLAG_w)) {
+ printf("Active %s (%s servers)\n", "Internet connections", type);
+ printf("Proto Recv-Q Send-Q %*s %*s State ", -TT.wpad, "Local Address",
+ -TT.wpad, "Foreign Address");
+ if (toys.optflags & FLAG_e) printf(" User Inode ");
+ if (toys.optflags & FLAG_p) printf(" PID/Program Name");
+ xputc('\n');
+
+ if (toys.optflags & FLAG_t) {
+ show_ip("/proc/net/tcp");
+ show_ip("/proc/net/tcp6");
+ }
+ if (toys.optflags & FLAG_u) {
+ show_ip("/proc/net/udp");
+ show_ip("/proc/net/udp6");
+ }
+ if (toys.optflags & FLAG_w) {
+ show_ip("/proc/net/raw");
+ show_ip("/proc/net/raw6");
+ }
+ }
+
+ if (toys.optflags & FLAG_x) {
+ printf("Active %s (%s servers)\n", "UNIX domain sockets", type);
+
+ printf("Proto RefCnt Flags\t Type\t State\t %s Path\n",
+ (toys.optflags&FLAG_p) ? "PID/Program Name" : "I-Node");
+ show_unix_sockets();
+ }
+
+ if ((toys.optflags & FLAG_p) && CFG_TOYBOX_FREE)
+ llist_traverse(TT.inodes, free);
+ toys.exitval = 0;
+}
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