574 lines
15 KiB
C
574 lines
15 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini netstat implementation(s) for busybox
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* based in part on the netstat implementation from net-tools.
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*
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* Copyright (C) 2002 by Bart Visscher <magick@linux-fan.com>
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*
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* 2002-04-20
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* IPV6 support added by Bart Visscher <magick@linux-fan.com>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include "libbb.h"
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#include "inet_common.h"
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enum {
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OPT_extended = 0x4,
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OPT_showroute = 0x100,
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OPT_widedisplay = 0x200 * ENABLE_FEATURE_NETSTAT_WIDE,
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};
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# define NETSTAT_OPTS "laentuwxr"USE_FEATURE_NETSTAT_WIDE("W")
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#define NETSTAT_CONNECTED 0x01
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#define NETSTAT_LISTENING 0x02
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#define NETSTAT_NUMERIC 0x04
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/* Must match getopt32 option string */
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#define NETSTAT_TCP 0x10
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#define NETSTAT_UDP 0x20
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#define NETSTAT_RAW 0x40
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#define NETSTAT_UNIX 0x80
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#define NETSTAT_ALLPROTO (NETSTAT_TCP|NETSTAT_UDP|NETSTAT_RAW|NETSTAT_UNIX)
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static smallint flags = NETSTAT_CONNECTED | NETSTAT_ALLPROTO;
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enum {
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TCP_ESTABLISHED = 1,
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TCP_SYN_SENT,
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TCP_SYN_RECV,
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TCP_FIN_WAIT1,
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TCP_FIN_WAIT2,
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TCP_TIME_WAIT,
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TCP_CLOSE,
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TCP_CLOSE_WAIT,
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TCP_LAST_ACK,
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TCP_LISTEN,
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TCP_CLOSING /* now a valid state */
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};
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static const char *const tcp_state[] = {
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"",
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"ESTABLISHED",
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"SYN_SENT",
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"SYN_RECV",
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"FIN_WAIT1",
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"FIN_WAIT2",
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"TIME_WAIT",
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"CLOSE",
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"CLOSE_WAIT",
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"LAST_ACK",
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"LISTEN",
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"CLOSING"
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};
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typedef enum {
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SS_FREE = 0, /* not allocated */
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SS_UNCONNECTED, /* unconnected to any socket */
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SS_CONNECTING, /* in process of connecting */
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SS_CONNECTED, /* connected to socket */
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SS_DISCONNECTING /* in process of disconnecting */
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} socket_state;
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#define SO_ACCEPTCON (1<<16) /* performed a listen */
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#define SO_WAITDATA (1<<17) /* wait data to read */
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#define SO_NOSPACE (1<<18) /* no space to write */
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/* Standard printout size */
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#define PRINT_IP_MAX_SIZE 23
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#define PRINT_NET_CONN "%s %6ld %6ld %-23s %-23s %-12s\n"
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#define PRINT_NET_CONN_HEADER "\nProto Recv-Q Send-Q %-23s %-23s State\n"
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/* When there are IPv6 connections the IPv6 addresses will be
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* truncated to none-recognition. The '-W' option makes the
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* address columns wide enough to accomodate for longest possible
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* IPv6 addresses, i.e. addresses of the form
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* xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:ddd.ddd.ddd.ddd
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*/
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#define PRINT_IP_MAX_SIZE_WIDE 51 /* INET6_ADDRSTRLEN + 5 for the port number */
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#define PRINT_NET_CONN_WIDE "%s %6ld %6ld %-51s %-51s %-12s\n"
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#define PRINT_NET_CONN_HEADER_WIDE "\nProto Recv-Q Send-Q %-51s %-51s State\n"
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static const char *net_conn_line = PRINT_NET_CONN;
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#if ENABLE_FEATURE_IPV6
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static void build_ipv6_addr(char* local_addr, struct sockaddr_in6* localaddr)
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{
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char addr6[INET6_ADDRSTRLEN];
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struct in6_addr in6;
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sscanf(local_addr, "%08X%08X%08X%08X",
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&in6.s6_addr32[0], &in6.s6_addr32[1],
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&in6.s6_addr32[2], &in6.s6_addr32[3]);
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inet_ntop(AF_INET6, &in6, addr6, sizeof(addr6));
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inet_pton(AF_INET6, addr6, (struct sockaddr *) &localaddr->sin6_addr);
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localaddr->sin6_family = AF_INET6;
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}
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#endif
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#if ENABLE_FEATURE_IPV6
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static void build_ipv4_addr(char* local_addr, struct sockaddr_in6* localaddr)
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#else
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static void build_ipv4_addr(char* local_addr, struct sockaddr_in* localaddr)
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#endif
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{
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sscanf(local_addr, "%X",
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&((struct sockaddr_in *) localaddr)->sin_addr.s_addr);
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((struct sockaddr *) localaddr)->sa_family = AF_INET;
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}
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static const char *get_sname(int port, const char *proto, int numeric)
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{
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if (!port)
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return "*";
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if (!numeric) {
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struct servent *se = getservbyport(port, proto);
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if (se)
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return se->s_name;
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}
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/* hummm, we may return static buffer here!! */
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return itoa(ntohs(port));
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}
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static char *ip_port_str(struct sockaddr *addr, int port, const char *proto, int numeric)
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{
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enum { salen = USE_FEATURE_IPV6(sizeof(struct sockaddr_in6)) SKIP_FEATURE_IPV6(sizeof(struct sockaddr_in)) };
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char *host, *host_port;
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/* Code which used "*" for INADDR_ANY is removed: it's ambiguous in IPv6,
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* while "0.0.0.0" is not. */
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host = numeric ? xmalloc_sockaddr2dotted_noport(addr)
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: xmalloc_sockaddr2host_noport(addr);
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host_port = xasprintf("%s:%s", host, get_sname(htons(port), proto, numeric));
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free(host);
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return host_port;
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}
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static int tcp_do_one(int lnr, char *line)
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{
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char local_addr[64], rem_addr[64];
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char more[512];
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int num, local_port, rem_port, d, state, timer_run, uid, timeout;
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#if ENABLE_FEATURE_IPV6
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struct sockaddr_in6 localaddr, remaddr;
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#else
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struct sockaddr_in localaddr, remaddr;
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#endif
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unsigned long rxq, txq, time_len, retr, inode;
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if (lnr == 0)
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return 0;
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more[0] = '\0';
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num = sscanf(line,
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"%d: %64[0-9A-Fa-f]:%X %64[0-9A-Fa-f]:%X %X %lX:%lX %X:%lX %lX %d %d %ld %512s\n",
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&d, local_addr, &local_port,
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rem_addr, &rem_port, &state,
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&txq, &rxq, &timer_run, &time_len, &retr, &uid, &timeout, &inode, more);
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if (num < 10) {
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return 1; /* error */
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}
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if (strlen(local_addr) > 8) {
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#if ENABLE_FEATURE_IPV6
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build_ipv6_addr(local_addr, &localaddr);
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build_ipv6_addr(rem_addr, &remaddr);
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#endif
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} else {
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build_ipv4_addr(local_addr, &localaddr);
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build_ipv4_addr(rem_addr, &remaddr);
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}
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if ((rem_port && (flags & NETSTAT_CONNECTED))
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|| (!rem_port && (flags & NETSTAT_LISTENING))
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) {
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char *l = ip_port_str(
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(struct sockaddr *) &localaddr, local_port,
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"tcp", flags & NETSTAT_NUMERIC);
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char *r = ip_port_str(
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(struct sockaddr *) &remaddr, rem_port,
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"tcp", flags & NETSTAT_NUMERIC);
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printf(net_conn_line,
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"tcp", rxq, txq, l, r, tcp_state[state]);
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free(l);
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free(r);
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}
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return 0;
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}
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static int udp_do_one(int lnr, char *line)
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{
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char local_addr[64], rem_addr[64];
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const char *state_str;
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char more[512];
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int num, local_port, rem_port, d, state, timer_run, uid, timeout;
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#if ENABLE_FEATURE_IPV6
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struct sockaddr_in6 localaddr, remaddr;
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#else
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struct sockaddr_in localaddr, remaddr;
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#endif
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unsigned long rxq, txq, time_len, retr, inode;
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if (lnr == 0)
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return 0;
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more[0] = '\0';
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num = sscanf(line,
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"%d: %64[0-9A-Fa-f]:%X %64[0-9A-Fa-f]:%X %X %lX:%lX %X:%lX %lX %d %d %ld %512s\n",
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&d, local_addr, &local_port,
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rem_addr, &rem_port, &state,
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&txq, &rxq, &timer_run, &time_len, &retr, &uid, &timeout, &inode, more);
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if (strlen(local_addr) > 8) {
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#if ENABLE_FEATURE_IPV6
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/* Demangle what the kernel gives us */
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build_ipv6_addr(local_addr, &localaddr);
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build_ipv6_addr(rem_addr, &remaddr);
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#endif
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} else {
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build_ipv4_addr(local_addr, &localaddr);
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build_ipv4_addr(rem_addr, &remaddr);
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}
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if (num < 10) {
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return 1; /* error */
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}
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switch (state) {
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case TCP_ESTABLISHED:
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state_str = "ESTABLISHED";
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break;
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case TCP_CLOSE:
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state_str = "";
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break;
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default:
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state_str = "UNKNOWN";
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break;
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}
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#if ENABLE_FEATURE_IPV6
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# define notnull(A) ( \
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( (A.sin6_family == AF_INET6) \
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&& (A.sin6_addr.s6_addr32[0] | A.sin6_addr.s6_addr32[1] | \
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A.sin6_addr.s6_addr32[2] | A.sin6_addr.s6_addr32[3]) \
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) || ( \
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(A.sin6_family == AF_INET) \
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&& ((struct sockaddr_in*)&A)->sin_addr.s_addr \
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) \
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)
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#else
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# define notnull(A) (A.sin_addr.s_addr)
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#endif
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{
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int have_remaddr = notnull(remaddr);
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if ((have_remaddr && (flags & NETSTAT_CONNECTED))
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|| (!have_remaddr && (flags & NETSTAT_LISTENING))
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) {
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char *l = ip_port_str(
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(struct sockaddr *) &localaddr, local_port,
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"udp", flags & NETSTAT_NUMERIC);
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char *r = ip_port_str(
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(struct sockaddr *) &remaddr, rem_port,
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"udp", flags & NETSTAT_NUMERIC);
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printf(net_conn_line,
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"udp", rxq, txq, l, r, state_str);
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free(l);
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free(r);
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}
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}
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return 0;
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}
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static int raw_do_one(int lnr, char *line)
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{
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char local_addr[64], rem_addr[64];
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char more[512];
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int num, local_port, rem_port, d, state, timer_run, uid, timeout;
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#if ENABLE_FEATURE_IPV6
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struct sockaddr_in6 localaddr, remaddr;
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#else
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struct sockaddr_in localaddr, remaddr;
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#endif
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unsigned long rxq, txq, time_len, retr, inode;
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if (lnr == 0)
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return 0;
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more[0] = '\0';
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num = sscanf(line,
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"%d: %64[0-9A-Fa-f]:%X %64[0-9A-Fa-f]:%X %X %lX:%lX %X:%lX %lX %d %d %ld %512s\n",
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&d, local_addr, &local_port,
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rem_addr, &rem_port, &state,
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&txq, &rxq, &timer_run, &time_len, &retr, &uid, &timeout, &inode, more);
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if (strlen(local_addr) > 8) {
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#if ENABLE_FEATURE_IPV6
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build_ipv6_addr(local_addr, &localaddr);
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build_ipv6_addr(rem_addr, &remaddr);
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#endif
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} else {
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build_ipv4_addr(local_addr, &localaddr);
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build_ipv4_addr(rem_addr, &remaddr);
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}
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if (num < 10) {
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return 1; /* error */
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}
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{
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int have_remaddr = notnull(remaddr);
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if ((have_remaddr && (flags & NETSTAT_CONNECTED))
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|| (!have_remaddr && (flags & NETSTAT_LISTENING))
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) {
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char *l = ip_port_str(
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(struct sockaddr *) &localaddr, local_port,
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"raw", flags & NETSTAT_NUMERIC);
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char *r = ip_port_str(
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(struct sockaddr *) &remaddr, rem_port,
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"raw", flags & NETSTAT_NUMERIC);
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printf(net_conn_line,
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"raw", rxq, txq, l, r, itoa(state));
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free(l);
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free(r);
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}
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}
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return 0;
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}
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static int unix_do_one(int nr, char *line)
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{
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unsigned long refcnt, proto, unix_flags;
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unsigned long inode;
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int type, state;
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int num, path_ofs;
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void *d;
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const char *ss_proto, *ss_state, *ss_type;
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char ss_flags[32];
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if (nr == 0)
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return 0; /* skip header */
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/* 2.6.15 may report lines like "... @/tmp/fam-user-^@^@^@^@^@^@^@..."
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* Other users report long lines filled by NUL bytes.
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* (those ^@ are NUL bytes too). We see them as empty lines. */
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if (!line[0])
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return 0;
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path_ofs = 0; /* paranoia */
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num = sscanf(line, "%p: %lX %lX %lX %X %X %lu %n",
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&d, &refcnt, &proto, &unix_flags, &type, &state, &inode, &path_ofs);
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if (num < 7) {
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return 1; /* error */
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}
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if ((flags & (NETSTAT_LISTENING|NETSTAT_CONNECTED)) != (NETSTAT_LISTENING|NETSTAT_CONNECTED)) {
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if ((state == SS_UNCONNECTED) && (unix_flags & SO_ACCEPTCON)) {
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if (!(flags & NETSTAT_LISTENING))
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return 0;
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} else {
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if (!(flags & NETSTAT_CONNECTED))
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return 0;
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}
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}
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switch (proto) {
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case 0:
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ss_proto = "unix";
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break;
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default:
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ss_proto = "??";
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}
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switch (type) {
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case SOCK_STREAM:
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ss_type = "STREAM";
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break;
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case SOCK_DGRAM:
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ss_type = "DGRAM";
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break;
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case SOCK_RAW:
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ss_type = "RAW";
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break;
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case SOCK_RDM:
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ss_type = "RDM";
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break;
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case SOCK_SEQPACKET:
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ss_type = "SEQPACKET";
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break;
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default:
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ss_type = "UNKNOWN";
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}
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switch (state) {
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case SS_FREE:
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ss_state = "FREE";
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break;
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case SS_UNCONNECTED:
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/*
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* Unconnected sockets may be listening
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* for something.
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*/
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if (unix_flags & SO_ACCEPTCON) {
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ss_state = "LISTENING";
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} else {
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ss_state = "";
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}
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break;
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case SS_CONNECTING:
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ss_state = "CONNECTING";
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break;
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case SS_CONNECTED:
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ss_state = "CONNECTED";
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break;
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case SS_DISCONNECTING:
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ss_state = "DISCONNECTING";
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break;
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default:
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ss_state = "UNKNOWN";
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}
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strcpy(ss_flags, "[ ");
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if (unix_flags & SO_ACCEPTCON)
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strcat(ss_flags, "ACC ");
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if (unix_flags & SO_WAITDATA)
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strcat(ss_flags, "W ");
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if (unix_flags & SO_NOSPACE)
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strcat(ss_flags, "N ");
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strcat(ss_flags, "]");
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printf("%-5s %-6ld %-11s %-10s %-13s %6lu ",
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ss_proto, refcnt, ss_flags, ss_type, ss_state, inode
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);
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/* TODO: currently we stop at first NUL byte. Is it a problem? */
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line += path_ofs;
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*strchrnul(line, '\n') = '\0';
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while (*line)
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fputc_printable(*line++, stdout);
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bb_putchar('\n');
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return 0;
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}
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#define _PATH_PROCNET_UDP "/proc/net/udp"
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#define _PATH_PROCNET_UDP6 "/proc/net/udp6"
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#define _PATH_PROCNET_TCP "/proc/net/tcp"
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#define _PATH_PROCNET_TCP6 "/proc/net/tcp6"
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#define _PATH_PROCNET_RAW "/proc/net/raw"
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#define _PATH_PROCNET_RAW6 "/proc/net/raw6"
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#define _PATH_PROCNET_UNIX "/proc/net/unix"
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static void do_info(const char *file, const char *name, int (*proc)(int, char *))
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{
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int lnr;
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FILE *procinfo;
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char *buffer;
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procinfo = fopen(file, "r");
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if (procinfo == NULL) {
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if (errno != ENOENT) {
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bb_simple_perror_msg(file);
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} else {
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bb_error_msg("no kernel support for %s", name);
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}
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return;
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}
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lnr = 0;
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/* Why? because xmalloc_fgets_str doesn't stop on NULs */
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while ((buffer = xmalloc_fgets_str(procinfo, "\n")) != NULL) {
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if (proc(lnr++, buffer))
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bb_error_msg("%s: bogus data on line %d", file, lnr);
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free(buffer);
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}
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fclose(procinfo);
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}
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int netstat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int netstat_main(int argc UNUSED_PARAM, char **argv)
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{
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const char *net_conn_line_header = PRINT_NET_CONN_HEADER;
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unsigned opt;
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#if ENABLE_FEATURE_IPV6
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smallint inet = 1;
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smallint inet6 = 1;
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#else
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enum { inet = 1, inet6 = 0 };
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#endif
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/* Option string must match NETSTAT_xxx constants */
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opt = getopt32(argv, NETSTAT_OPTS);
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if (opt & 0x1) { // -l
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flags &= ~NETSTAT_CONNECTED;
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flags |= NETSTAT_LISTENING;
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}
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if (opt & 0x2) flags |= NETSTAT_LISTENING | NETSTAT_CONNECTED; // -a
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//if (opt & 0x4) // -e
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if (opt & 0x8) flags |= NETSTAT_NUMERIC; // -n
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//if (opt & 0x10) // -t: NETSTAT_TCP
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//if (opt & 0x20) // -u: NETSTAT_UDP
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//if (opt & 0x40) // -w: NETSTAT_RAW
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//if (opt & 0x80) // -x: NETSTAT_UNIX
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if (opt & OPT_showroute) { // -r
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#if ENABLE_ROUTE
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bb_displayroutes(flags & NETSTAT_NUMERIC, !(opt & OPT_extended));
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return 0;
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#else
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bb_show_usage();
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#endif
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}
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if (opt & OPT_widedisplay) { // -W
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net_conn_line = PRINT_NET_CONN_WIDE;
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net_conn_line_header = PRINT_NET_CONN_HEADER_WIDE;
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}
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opt &= NETSTAT_ALLPROTO;
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if (opt) {
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flags &= ~NETSTAT_ALLPROTO;
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flags |= opt;
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}
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if (flags & (NETSTAT_TCP|NETSTAT_UDP|NETSTAT_RAW)) {
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printf("Active Internet connections "); /* xxx */
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if ((flags & (NETSTAT_LISTENING|NETSTAT_CONNECTED)) == (NETSTAT_LISTENING|NETSTAT_CONNECTED))
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printf("(servers and established)");
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else if (flags & NETSTAT_LISTENING)
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printf("(only servers)");
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else
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printf("(w/o servers)");
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printf(net_conn_line_header, "Local Address", "Foreign Address");
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}
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if (inet && flags & NETSTAT_TCP)
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do_info(_PATH_PROCNET_TCP, "AF INET (tcp)", tcp_do_one);
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#if ENABLE_FEATURE_IPV6
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if (inet6 && flags & NETSTAT_TCP)
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do_info(_PATH_PROCNET_TCP6, "AF INET6 (tcp)", tcp_do_one);
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#endif
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if (inet && flags & NETSTAT_UDP)
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do_info(_PATH_PROCNET_UDP, "AF INET (udp)", udp_do_one);
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#if ENABLE_FEATURE_IPV6
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if (inet6 && flags & NETSTAT_UDP)
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do_info(_PATH_PROCNET_UDP6, "AF INET6 (udp)", udp_do_one);
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#endif
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if (inet && flags & NETSTAT_RAW)
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do_info(_PATH_PROCNET_RAW, "AF INET (raw)", raw_do_one);
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#if ENABLE_FEATURE_IPV6
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if (inet6 && flags & NETSTAT_RAW)
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do_info(_PATH_PROCNET_RAW6, "AF INET6 (raw)", raw_do_one);
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#endif
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if (flags & NETSTAT_UNIX) {
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printf("Active UNIX domain sockets ");
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if ((flags & (NETSTAT_LISTENING|NETSTAT_CONNECTED)) == (NETSTAT_LISTENING|NETSTAT_CONNECTED))
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printf("(servers and established)");
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else if (flags & NETSTAT_LISTENING)
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printf("(only servers)");
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else
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printf("(w/o servers)");
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printf("\nProto RefCnt Flags Type State I-Node Path\n");
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do_info(_PATH_PROCNET_UNIX, "AF UNIX", unix_do_one);
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}
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return 0;
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}
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