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- /* 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 netstat -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 Show PID/program name of sockets
- */
- #define FOR_netstat
- #include "toys.h"
- #include <net/route.h>
- GLOBALS(
- struct num_cache *inodes;
- int wpad;
- )
- static void addr2str(int af, void *addr, unsigned port, char *buf, int len,
- char *proto)
- {
- char pres[INET6_ADDRSTRLEN];
- struct servent *se = 0;
- int pos, count;
- if (!inet_ntop(af, addr, pres, sizeof(pres))) perror_exit("inet_ntop");
- if (FLAG(n) || !port) {
- strcpy(buf, pres);
- } else {
- struct addrinfo hints, *result, *rp;
- char cut[4];
- memset(&hints, 0, sizeof(struct addrinfo));
- hints.ai_family = af;
- if (!getaddrinfo(pres, 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;
- }
- // getservbyport() doesn't understand proto "tcp6", so truncate
- memcpy(cut, proto, 3);
- cut[3] = 0;
- se = getservbyport(htons(port), cut);
- }
- if (!strcmp(buf, "::")) strcpy(buf, "[::]");
- // Append :service or :* if port == 0.
- if (se) {
- count = snprintf(0, 0, ":%s", se->s_name);
- // NI_MAXSERV == 32, which is greater than our minimum field width.
- // (Although the longest service name on Debian in 2021 is only 16 bytes.)
- if (count>=len) {
- count = len-1;
- se->s_name[count] = 0;
- }
- } else count = port ? snprintf(0, 0, ":%u", port) : 2;
- // We always show the port, even if that means clobbering the end of the host.
- pos = strlen(buf);
- if (len-pos<count) pos = len-count;
- if (se) sprintf(buf+pos, ":%s", se->s_name);
- else sprintf(buf+pos, port ? ":%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"};
- FILE *fp = xfopen(fname, "r");
- // Skip header.
- fgets(toybuf, sizeof(toybuf), fp);
- 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, af = AF_INET6;
- unsigned long inode;
- // Try ipv6, then try ipv4
- if (16 != 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))
- {
- af = AF_INET;
- if (10 != 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)) continue;
- }
- // Should we display this? (listening or all or TCP/UDP/RAW)
- if (!(FLAG(l) && (!rport && (state&0xA))) && !FLAG(a) && !(rport&0x70))
- continue;
- addr2str(af, &laddr, lport, lip, TT.wpad, label);
- addr2str(af, &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);
- printf("%-6s%6d%7d %*.*s %*.*s %-11s", label, rxq, txq, -TT.wpad, TT.wpad,
- lip, -TT.wpad, TT.wpad, rip, ss_state);
- if (FLAG(e)) {
- if (FLAG(n)) sprintf(s = toybuf, "%d", uid);
- else s = getusername(uid);
- printf(" %-10s %-11ld", s, inode);
- }
- if (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"},
- *filename = 0;
- unsigned long refcount, flags, type, state, inode;
- FILE *fp = xfopen("/proc/net/unix", "r");
- // Skip header.
- fgets(toybuf, sizeof(toybuf), fp);
- while (fscanf(fp, "%*p: %lX %*X %lX %lX %lX %lu%m[^\n]", &refcount, &flags,
- &type, &state, &inode, &filename) >= 5) {
- // 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 or -l.
- if (state==1 && flags && !(FLAG(a) || FLAG(l))) 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;
- if (state!=1 && FLAG(l)) continue;
- sprintf(toybuf, "[ %s]", flags ? "ACC " : "");
- printf("unix %-6ld %-11s %-10s %-13s %-8lu ",
- refcount, toybuf, types[type], states[state], inode);
- if (FLAG(p)) {
- struct num_cache *nc = get_num_cache(TT.inodes, inode);
- printf("%-19.19s ", nc ? nc->data : "-");
- }
- if (filename) {
- printf("%s\n", filename+!FLAG(p));
- free(filename);
- filename = 0;
- } else 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);
- else 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 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");
- // Skip header.
- fgets(toybuf, sizeof(toybuf), fp);
- printf("Kernel IP routing table\n"
- "Destination\tGateway \tGenmask \tFlags %s Iface\n",
- !FLAG(e) ? " MSS Window irtt" : "Metric Ref Use");
- while (fscanf(fp, "%63s%x%x%X%d%d%d%x%d%d%d", iface, &dest, &gate, &flags,
- &ref, &use, &metric, &mask, &mss, &win, &irtt) == 11) {
- char *destip = 0, *gateip = 0, *maskip = 0;
- // 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 = FLAG(n) ? "0.0.0.0" : "default";
- out += 16;
- if (gate) {
- if (inet_ntop(AF_INET, &gate, out, 16)) gateip = out;
- } else gateip = 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 (!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 servers";
- TT.wpad = FLAG(W) ? 51 : 23;
- if (!(toys.optflags&(FLAG_r|tuwx))) toys.optflags |= tuwx;
- if (FLAG(r)) display_routes();
- if (!(toys.optflags&tuwx)) return;
- if (FLAG(a)) type = "servers and established";
- else if (FLAG(l)) type = "only servers";
- if (FLAG(p)) dirtree_read("/proc", scan_pids);
- if (toys.optflags&(FLAG_t|FLAG_u|FLAG_w)) {
- printf("Active Internet connections (%s)\n", type);
- printf("Proto Recv-Q Send-Q %*s %*s State ", -TT.wpad, "Local Address",
- -TT.wpad, "Foreign Address");
- if (FLAG(e)) printf(" User Inode ");
- if (FLAG(p)) printf(" PID/Program Name");
- xputc('\n');
- if (FLAG(t)) {
- show_ip("/proc/net/tcp");
- show_ip("/proc/net/tcp6");
- }
- if (FLAG(u)) {
- show_ip("/proc/net/udp");
- show_ip("/proc/net/udp6");
- }
- if (FLAG(w)) {
- show_ip("/proc/net/raw");
- show_ip("/proc/net/raw6");
- }
- }
- if (FLAG(x)) {
- printf("Active UNIX domain sockets (%s)\n", type);
- printf("Proto RefCnt Flags Type State I-Node%sPath\n",
- FLAG(p) ? " PID/Program Name " : " ");
- show_unix_sockets();
- }
- if (FLAG(p) && CFG_TOYBOX_FREE) llist_traverse(TT.inodes, free);
- toys.exitval = 0;
- }
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