/* vi: set sw=4 ts=4: */ /* * Mini netstat implementation(s) for busybox * based in part on the netstat implementation from net-tools. * * Copyright (C) 2002 by Bart Visscher <magick@linux-fan.com> * * 2002-04-20 * IPV6 support added by Bart Visscher <magick@linux-fan.com> * * 2008-07-10 * optional '-p' flag support ported from net-tools by G. Somlo <somlo@cmu.edu> * * Licensed under GPLv2 or later, see file LICENSE in this source tree. */ #include "libbb.h" #include "inet_common.h" //usage:#define netstat_trivial_usage //usage: "[-"IF_ROUTE("r")"al] [-tuwx] [-en"IF_FEATURE_NETSTAT_WIDE("W")IF_FEATURE_NETSTAT_PRG("p")"]" //usage:#define netstat_full_usage "\n\n" //usage: "Display networking information\n" //usage: IF_ROUTE( //usage: "\n -r Routing table" //usage: ) //usage: "\n -a All sockets" //usage: "\n -l Listening sockets" //usage: "\n Else: connected sockets" //usage: "\n -t TCP sockets" //usage: "\n -u UDP sockets" //usage: "\n -w Raw sockets" //usage: "\n -x Unix sockets" //usage: "\n Else: all socket types" //usage: "\n -e Other/more information" //usage: "\n -n Don't resolve names" //usage: IF_FEATURE_NETSTAT_WIDE( //usage: "\n -W Wide display" //usage: ) //usage: IF_FEATURE_NETSTAT_PRG( //usage: "\n -p Show PID/program name for sockets" //usage: ) #define NETSTAT_OPTS "laentuwx" \ IF_ROUTE( "r") \ IF_FEATURE_NETSTAT_WIDE("W") \ IF_FEATURE_NETSTAT_PRG( "p") enum { OPT_sock_listen = 1 << 0, // l OPT_sock_all = 1 << 1, // a OPT_extended = 1 << 2, // e OPT_noresolve = 1 << 3, // n OPT_sock_tcp = 1 << 4, // t OPT_sock_udp = 1 << 5, // u OPT_sock_raw = 1 << 6, // w OPT_sock_unix = 1 << 7, // x OPTBIT_x = 7, IF_ROUTE( OPTBIT_ROUTE,) IF_FEATURE_NETSTAT_WIDE(OPTBIT_WIDE ,) IF_FEATURE_NETSTAT_PRG( OPTBIT_PRG ,) OPT_route = IF_ROUTE( (1 << OPTBIT_ROUTE)) + 0, // r OPT_wide = IF_FEATURE_NETSTAT_WIDE((1 << OPTBIT_WIDE )) + 0, // W OPT_prg = IF_FEATURE_NETSTAT_PRG( (1 << OPTBIT_PRG )) + 0, // p }; #define NETSTAT_CONNECTED 0x01 #define NETSTAT_LISTENING 0x02 #define NETSTAT_NUMERIC 0x04 /* Must match getopt32 option string */ #define NETSTAT_TCP 0x10 #define NETSTAT_UDP 0x20 #define NETSTAT_RAW 0x40 #define NETSTAT_UNIX 0x80 #define NETSTAT_ALLPROTO (NETSTAT_TCP|NETSTAT_UDP|NETSTAT_RAW|NETSTAT_UNIX) enum { TCP_ESTABLISHED = 1, TCP_SYN_SENT, TCP_SYN_RECV, TCP_FIN_WAIT1, TCP_FIN_WAIT2, TCP_TIME_WAIT, TCP_CLOSE, TCP_CLOSE_WAIT, TCP_LAST_ACK, TCP_LISTEN, TCP_CLOSING, /* now a valid state */ }; static const char *const tcp_state[] = { "", "ESTABLISHED", "SYN_SENT", "SYN_RECV", "FIN_WAIT1", "FIN_WAIT2", "TIME_WAIT", "CLOSE", "CLOSE_WAIT", "LAST_ACK", "LISTEN", "CLOSING" }; typedef enum { SS_FREE = 0, /* not allocated */ SS_UNCONNECTED, /* unconnected to any socket */ SS_CONNECTING, /* in process of connecting */ SS_CONNECTED, /* connected to socket */ SS_DISCONNECTING /* in process of disconnecting */ } socket_state; #define SO_ACCEPTCON (1<<16) /* performed a listen */ #define SO_WAITDATA (1<<17) /* wait data to read */ #define SO_NOSPACE (1<<18) /* no space to write */ #define ADDR_NORMAL_WIDTH 23 /* When there are IPv6 connections the IPv6 addresses will be * truncated to none-recognition. The '-W' option makes the * address columns wide enough to accommodate for longest possible * IPv6 addresses, i.e. addresses of the form * xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:ddd.ddd.ddd.ddd */ #define ADDR_WIDE 51 /* INET6_ADDRSTRLEN + 5 for the port number */ #if ENABLE_FEATURE_NETSTAT_WIDE # define FMT_NET_CONN_DATA "%s %6lu %6lu %-*s %-*s %-12s" # define FMT_NET_CONN_HEADER "\nProto Recv-Q Send-Q %-*s %-*s State %s\n" #else # define FMT_NET_CONN_DATA "%s %6lu %6lu %-23s %-23s %-12s" # define FMT_NET_CONN_HEADER "\nProto Recv-Q Send-Q %-23s %-23s State %s\n" #endif #define PROGNAME_WIDTH 20 #define PROGNAME_WIDTH_STR "20" /* PROGNAME_WIDTH chars: 12345678901234567890 */ #define PROGNAME_BANNER "PID/Program name " struct prg_node { struct prg_node *next; long inode; char name[PROGNAME_WIDTH]; }; #define PRG_HASH_SIZE 211 struct globals { smallint flags; #if ENABLE_FEATURE_NETSTAT_PRG smallint prg_cache_loaded; struct prg_node *prg_hash[PRG_HASH_SIZE]; #endif #if ENABLE_FEATURE_NETSTAT_PRG const char *progname_banner; #endif #if ENABLE_FEATURE_NETSTAT_WIDE unsigned addr_width; #endif }; #define G (*ptr_to_globals) #define flags (G.flags ) #define prg_cache_loaded (G.prg_cache_loaded) #define prg_hash (G.prg_hash ) #if ENABLE_FEATURE_NETSTAT_PRG # define progname_banner (G.progname_banner ) #else # define progname_banner "" #endif #define INIT_G() do { \ SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \ flags = NETSTAT_CONNECTED | NETSTAT_ALLPROTO; \ } while (0) #if ENABLE_FEATURE_NETSTAT_PRG /* Deliberately truncating long to unsigned *int* */ #define PRG_HASHIT(x) ((unsigned)(x) % PRG_HASH_SIZE) static void prg_cache_add(long inode, char *name) { unsigned hi = PRG_HASHIT(inode); struct prg_node **pnp, *pn; prg_cache_loaded = 2; for (pnp = prg_hash + hi; (pn = *pnp) != NULL; pnp = &pn->next) { if (pn->inode == inode) { /* Some warning should be appropriate here * as we got multiple processes for one i-node */ return; } } *pnp = xzalloc(sizeof(struct prg_node)); pn = *pnp; pn->inode = inode; safe_strncpy(pn->name, name, PROGNAME_WIDTH); } static const char *prg_cache_get(long inode) { unsigned hi = PRG_HASHIT(inode); struct prg_node *pn; for (pn = prg_hash[hi]; pn; pn = pn->next) if (pn->inode == inode) return pn->name; return "-"; } #if ENABLE_FEATURE_CLEAN_UP static void prg_cache_clear(void) { struct prg_node **pnp, *pn; for (pnp = prg_hash; pnp < prg_hash + PRG_HASH_SIZE; pnp++) { while ((pn = *pnp) != NULL) { *pnp = pn->next; free(pn); } } } #else #define prg_cache_clear() ((void)0) #endif static long extract_socket_inode(const char *lname) { long inode = -1; if (is_prefixed_with(lname, "socket:[")) { /* "socket:[12345]", extract the "12345" as inode */ inode = bb_strtoul(lname + sizeof("socket:[")-1, (char**)&lname, 0); if (*lname != ']') inode = -1; } else if (is_prefixed_with(lname, "[0000]:")) { /* "[0000]:12345", extract the "12345" as inode */ inode = bb_strtoul(lname + sizeof("[0000]:")-1, NULL, 0); if (errno) /* not NUL terminated? */ inode = -1; } #if 0 /* bb_strtol returns all-ones bit pattern on ERANGE anyway */ if (errno == ERANGE) inode = -1; #endif return inode; } static int FAST_FUNC add_to_prg_cache_if_socket(const char *fileName, struct stat *statbuf UNUSED_PARAM, void *pid_slash_progname, int depth UNUSED_PARAM) { char *linkname; long inode; linkname = xmalloc_readlink(fileName); if (linkname != NULL) { inode = extract_socket_inode(linkname); free(linkname); if (inode >= 0) prg_cache_add(inode, (char *)pid_slash_progname); } return TRUE; } static int FAST_FUNC dir_act(const char *fileName, struct stat *statbuf UNUSED_PARAM, void *userData UNUSED_PARAM, int depth) { const char *pid; char *pid_slash_progname; char proc_pid_fname[sizeof("/proc/%u/cmdline") + sizeof(long)*3]; char cmdline_buf[512]; int n, len; if (depth == 0) /* "/proc" itself */ return TRUE; /* continue looking one level below /proc */ pid = fileName + sizeof("/proc/")-1; /* point after "/proc/" */ if (!isdigit(pid[0])) /* skip /proc entries which aren't processes */ return SKIP; len = snprintf(proc_pid_fname, sizeof(proc_pid_fname), "%s/cmdline", fileName); n = open_read_close(proc_pid_fname, cmdline_buf, sizeof(cmdline_buf) - 1); if (n < 0) return FALSE; cmdline_buf[n] = '\0'; /* go through all files in /proc/PID/fd and check whether they are sockets */ strcpy(proc_pid_fname + len - (sizeof("cmdline")-1), "fd"); pid_slash_progname = concat_path_file(pid, bb_basename(cmdline_buf)); /* "PID/argv0" */ n = recursive_action(proc_pid_fname, ACTION_RECURSE | ACTION_QUIET, add_to_prg_cache_if_socket, NULL, (void *)pid_slash_progname, 0); free(pid_slash_progname); if (!n) return FALSE; /* signal permissions error to caller */ return SKIP; /* caller should not recurse further into this dir */ } static void prg_cache_load(void) { int load_ok; prg_cache_loaded = 1; load_ok = recursive_action("/proc", ACTION_RECURSE | ACTION_QUIET, NULL, dir_act, NULL, 0); if (load_ok) return; if (prg_cache_loaded == 1) bb_error_msg("can't scan /proc - are you root?"); else bb_error_msg("showing only processes with your user ID"); } #else #define prg_cache_clear() ((void)0) #endif //ENABLE_FEATURE_NETSTAT_PRG #if ENABLE_FEATURE_IPV6 static void build_ipv6_addr(char* local_addr, struct sockaddr_in6* localaddr) { char addr6[INET6_ADDRSTRLEN]; struct in6_addr in6; sscanf(local_addr, "%08X%08X%08X%08X", &in6.s6_addr32[0], &in6.s6_addr32[1], &in6.s6_addr32[2], &in6.s6_addr32[3]); inet_ntop(AF_INET6, &in6, addr6, sizeof(addr6)); inet_pton(AF_INET6, addr6, &localaddr->sin6_addr); localaddr->sin6_family = AF_INET6; } #endif static void build_ipv4_addr(char* local_addr, struct sockaddr_in* localaddr) { sscanf(local_addr, "%X", &localaddr->sin_addr.s_addr); localaddr->sin_family = AF_INET; } static const char *get_sname(int port, const char *proto, int numeric) { if (!port) return "*"; if (!numeric) { struct servent *se = getservbyport(port, proto); if (se) return se->s_name; } /* hummm, we may return static buffer here!! */ return itoa(ntohs(port)); } static char *ip_port_str(struct sockaddr *addr, int port, const char *proto, int numeric) { char *host, *host_port; /* Code which used "*" for INADDR_ANY is removed: it's ambiguous * in IPv6, while "0.0.0.0" is not. */ host = numeric ? xmalloc_sockaddr2dotted_noport(addr) : xmalloc_sockaddr2host_noport(addr); host_port = xasprintf("%s:%s", host, get_sname(htons(port), proto, numeric)); free(host); return host_port; } struct inet_params { int local_port, rem_port, state, uid; union { struct sockaddr sa; struct sockaddr_in sin; #if ENABLE_FEATURE_IPV6 struct sockaddr_in6 sin6; #endif } localaddr, remaddr; unsigned long rxq, txq, inode; }; static int scan_inet_proc_line(struct inet_params *param, char *line) { int num; /* IPv6 /proc files use 32-char hex representation * of IPv6 address, followed by :PORT_IN_HEX */ char local_addr[33], rem_addr[33]; /* 32 + 1 for NUL */ num = sscanf(line, "%*d: %32[0-9A-Fa-f]:%X " "%32[0-9A-Fa-f]:%X %X " "%lX:%lX %*X:%*X " "%*X %d %*d %lu ", local_addr, ¶m->local_port, rem_addr, ¶m->rem_port, ¶m->state, ¶m->txq, ¶m->rxq, ¶m->uid, ¶m->inode); if (num < 9) { return 1; /* error */ } if (strlen(local_addr) > 8) { #if ENABLE_FEATURE_IPV6 build_ipv6_addr(local_addr, ¶m->localaddr.sin6); build_ipv6_addr(rem_addr, ¶m->remaddr.sin6); #endif } else { build_ipv4_addr(local_addr, ¶m->localaddr.sin); build_ipv4_addr(rem_addr, ¶m->remaddr.sin); } return 0; } static void print_inet_line(struct inet_params *param, const char *state_str, const char *proto, int is_connected) { if ((is_connected && (flags & NETSTAT_CONNECTED)) || (!is_connected && (flags & NETSTAT_LISTENING)) ) { char *l = ip_port_str( ¶m->localaddr.sa, param->local_port, proto, flags & NETSTAT_NUMERIC); char *r = ip_port_str( ¶m->remaddr.sa, param->rem_port, proto, flags & NETSTAT_NUMERIC); printf(FMT_NET_CONN_DATA, proto, param->rxq, param->txq, IF_FEATURE_NETSTAT_WIDE(G.addr_width,) l, IF_FEATURE_NETSTAT_WIDE(G.addr_width,) r, state_str); #if ENABLE_FEATURE_NETSTAT_PRG if (option_mask32 & OPT_prg) printf("%."PROGNAME_WIDTH_STR"s", prg_cache_get(param->inode)); #endif bb_putchar('\n'); free(l); free(r); } } static int FAST_FUNC tcp_do_one(char *line) { struct inet_params param; memset(¶m, 0, sizeof(param)); if (scan_inet_proc_line(¶m, line)) return 1; print_inet_line(¶m, tcp_state[param.state], "tcp", param.rem_port); return 0; } #if ENABLE_FEATURE_IPV6 # define NOT_NULL_ADDR(A) ( \ ( (A.sa.sa_family == AF_INET6) \ && (A.sin6.sin6_addr.s6_addr32[0] | A.sin6.sin6_addr.s6_addr32[1] | \ A.sin6.sin6_addr.s6_addr32[2] | A.sin6.sin6_addr.s6_addr32[3]) \ ) || ( \ (A.sa.sa_family == AF_INET) \ && A.sin.sin_addr.s_addr != 0 \ ) \ ) #else # define NOT_NULL_ADDR(A) (A.sin.sin_addr.s_addr) #endif static int FAST_FUNC udp_do_one(char *line) { int have_remaddr; const char *state_str; struct inet_params param; memset(¶m, 0, sizeof(param)); /* otherwise we display garbage IPv6 scope_ids */ if (scan_inet_proc_line(¶m, line)) return 1; state_str = "UNKNOWN"; switch (param.state) { case TCP_ESTABLISHED: state_str = "ESTABLISHED"; break; case TCP_CLOSE: state_str = ""; break; } have_remaddr = NOT_NULL_ADDR(param.remaddr); print_inet_line(¶m, state_str, "udp", have_remaddr); return 0; } static int FAST_FUNC raw_do_one(char *line) { int have_remaddr; struct inet_params param; if (scan_inet_proc_line(¶m, line)) return 1; have_remaddr = NOT_NULL_ADDR(param.remaddr); print_inet_line(¶m, itoa(param.state), "raw", have_remaddr); return 0; } static int FAST_FUNC unix_do_one(char *line) { unsigned long refcnt, proto, unix_flags; unsigned long inode; int type, state; int num, path_ofs; const char *ss_proto, *ss_state, *ss_type; char ss_flags[32]; /* 2.6.15 may report lines like "... @/tmp/fam-user-^@^@^@^@^@^@^@..." * Other users report long lines filled by NUL bytes. * (those ^@ are NUL bytes too). We see them as empty lines. */ if (!line[0]) return 0; path_ofs = 0; /* paranoia */ num = sscanf(line, "%*p: %lX %lX %lX %X %X %lu %n", &refcnt, &proto, &unix_flags, &type, &state, &inode, &path_ofs); if (num < 6) { return 1; /* error */ } if ((flags & (NETSTAT_LISTENING|NETSTAT_CONNECTED)) != (NETSTAT_LISTENING|NETSTAT_CONNECTED)) { if ((state == SS_UNCONNECTED) && (unix_flags & SO_ACCEPTCON)) { if (!(flags & NETSTAT_LISTENING)) return 0; } else { if (!(flags & NETSTAT_CONNECTED)) return 0; } } switch (proto) { case 0: ss_proto = "unix"; break; default: ss_proto = "??"; } switch (type) { case SOCK_STREAM: ss_type = "STREAM"; break; case SOCK_DGRAM: ss_type = "DGRAM"; break; case SOCK_RAW: ss_type = "RAW"; break; case SOCK_RDM: ss_type = "RDM"; break; case SOCK_SEQPACKET: ss_type = "SEQPACKET"; break; default: ss_type = "UNKNOWN"; } switch (state) { case SS_FREE: ss_state = "FREE"; break; case SS_UNCONNECTED: /* * Unconnected sockets may be listening * for something. */ if (unix_flags & SO_ACCEPTCON) { ss_state = "LISTENING"; } else { ss_state = ""; } break; case SS_CONNECTING: ss_state = "CONNECTING"; break; case SS_CONNECTED: ss_state = "CONNECTED"; break; case SS_DISCONNECTING: ss_state = "DISCONNECTING"; break; default: ss_state = "UNKNOWN"; } strcpy(ss_flags, "[ "); if (unix_flags & SO_ACCEPTCON) strcat(ss_flags, "ACC "); if (unix_flags & SO_WAITDATA) strcat(ss_flags, "W "); if (unix_flags & SO_NOSPACE) strcat(ss_flags, "N "); strcat(ss_flags, "]"); printf("%-5s %-6lu %-11s %-10s %-13s %6lu ", ss_proto, refcnt, ss_flags, ss_type, ss_state, inode ); #if ENABLE_FEATURE_NETSTAT_PRG if (option_mask32 & OPT_prg) printf("%-"PROGNAME_WIDTH_STR"s", prg_cache_get(inode)); #endif /* TODO: currently we stop at first NUL byte. Is it a problem? */ line += path_ofs; chomp(line); while (*line) fputc_printable(*line++, stdout); bb_putchar('\n'); return 0; } static void do_info(const char *file, int FAST_FUNC (*proc)(char *)) { int lnr; FILE *procinfo; char *buffer; /* _stdin is just to save "r" param */ procinfo = fopen_or_warn_stdin(file); if (procinfo == NULL) { return; } lnr = 0; /* Why xmalloc_fgets_str? because it doesn't stop on NULs */ while ((buffer = xmalloc_fgets_str(procinfo, "\n")) != NULL) { /* line 0 is skipped */ if (lnr && proc(buffer)) bb_error_msg("%s: bogus data on line %d", file, lnr + 1); lnr++; free(buffer); } fclose(procinfo); } int netstat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int netstat_main(int argc UNUSED_PARAM, char **argv) { unsigned opt; INIT_G(); /* Option string must match NETSTAT_xxx constants */ opt = getopt32(argv, NETSTAT_OPTS); if (opt & OPT_sock_listen) { // -l flags &= ~NETSTAT_CONNECTED; flags |= NETSTAT_LISTENING; } if (opt & OPT_sock_all) flags |= NETSTAT_LISTENING | NETSTAT_CONNECTED; // -a //if (opt & OPT_extended) // -e if (opt & OPT_noresolve) flags |= NETSTAT_NUMERIC; // -n //if (opt & OPT_sock_tcp) // -t: NETSTAT_TCP //if (opt & OPT_sock_udp) // -u: NETSTAT_UDP //if (opt & OPT_sock_raw) // -w: NETSTAT_RAW //if (opt & OPT_sock_unix) // -x: NETSTAT_UNIX #if ENABLE_ROUTE if (opt & OPT_route) { // -r bb_displayroutes(flags & NETSTAT_NUMERIC, !(opt & OPT_extended)); return 0; } #endif #if ENABLE_FEATURE_NETSTAT_WIDE G.addr_width = ADDR_NORMAL_WIDTH; if (opt & OPT_wide) { // -W G.addr_width = ADDR_WIDE; } #endif #if ENABLE_FEATURE_NETSTAT_PRG progname_banner = ""; if (opt & OPT_prg) { // -p progname_banner = PROGNAME_BANNER; prg_cache_load(); } #endif opt &= NETSTAT_ALLPROTO; if (opt) { flags &= ~NETSTAT_ALLPROTO; flags |= opt; } if (flags & (NETSTAT_TCP|NETSTAT_UDP|NETSTAT_RAW)) { printf("Active Internet connections "); /* xxx */ if ((flags & (NETSTAT_LISTENING|NETSTAT_CONNECTED)) == (NETSTAT_LISTENING|NETSTAT_CONNECTED)) printf("(servers and established)"); else if (flags & NETSTAT_LISTENING) printf("(only servers)"); else printf("(w/o servers)"); printf(FMT_NET_CONN_HEADER, IF_FEATURE_NETSTAT_WIDE(G.addr_width,) "Local Address", IF_FEATURE_NETSTAT_WIDE(G.addr_width,) "Foreign Address", progname_banner ); } if (flags & NETSTAT_TCP) { do_info("/proc/net/tcp", tcp_do_one); #if ENABLE_FEATURE_IPV6 do_info("/proc/net/tcp6", tcp_do_one); #endif } if (flags & NETSTAT_UDP) { do_info("/proc/net/udp", udp_do_one); #if ENABLE_FEATURE_IPV6 do_info("/proc/net/udp6", udp_do_one); #endif } if (flags & NETSTAT_RAW) { do_info("/proc/net/raw", raw_do_one); #if ENABLE_FEATURE_IPV6 do_info("/proc/net/raw6", raw_do_one); #endif } if (flags & NETSTAT_UNIX) { printf("Active UNIX domain sockets "); if ((flags & (NETSTAT_LISTENING|NETSTAT_CONNECTED)) == (NETSTAT_LISTENING|NETSTAT_CONNECTED)) printf("(servers and established)"); else if (flags & NETSTAT_LISTENING) printf("(only servers)"); else printf("(w/o servers)"); printf("\nProto RefCnt Flags Type State I-Node %sPath\n", progname_banner); do_info("/proc/net/unix", unix_do_one); } prg_cache_clear(); return 0; }