/* 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 * * 2002-04-20 * IPV6 support added by Bart Visscher * * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. */ #include "libbb.h" #include "inet_common.h" enum { OPT_extended = 0x4, OPT_showroute = 0x100, OPT_widedisplay = 0x200 * ENABLE_FEATURE_NETSTAT_WIDE, }; # define NETSTAT_OPTS "laentuwxr"USE_FEATURE_NETSTAT_WIDE("W") #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) static smallint flags = NETSTAT_CONNECTED | NETSTAT_ALLPROTO; 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 */ /* Standard printout size */ #define PRINT_IP_MAX_SIZE 23 #define PRINT_NET_CONN "%s %6ld %6ld %-23s %-23s %-12s\n" #define PRINT_NET_CONN_HEADER "\nProto Recv-Q Send-Q %-23s %-23s State\n" /* When there are IPv6 connections the IPv6 addresses will be * truncated to none-recognition. The '-W' option makes the * address columns wide enough to accomodate for longest possible * IPv6 addresses, i.e. addresses of the form * xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:ddd.ddd.ddd.ddd */ #define PRINT_IP_MAX_SIZE_WIDE 51 /* INET6_ADDRSTRLEN + 5 for the port number */ #define PRINT_NET_CONN_WIDE "%s %6ld %6ld %-51s %-51s %-12s\n" #define PRINT_NET_CONN_HEADER_WIDE "\nProto Recv-Q Send-Q %-51s %-51s State\n" static const char *net_conn_line = PRINT_NET_CONN; #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, (struct sockaddr *) &localaddr->sin6_addr); localaddr->sin6_family = AF_INET6; } #endif #if ENABLE_FEATURE_IPV6 static void build_ipv4_addr(char* local_addr, struct sockaddr_in6* localaddr) #else static void build_ipv4_addr(char* local_addr, struct sockaddr_in* localaddr) #endif { sscanf(local_addr, "%X", &((struct sockaddr_in *) localaddr)->sin_addr.s_addr); ((struct sockaddr *) localaddr)->sa_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) { enum { salen = USE_FEATURE_IPV6(sizeof(struct sockaddr_in6)) SKIP_FEATURE_IPV6(sizeof(struct sockaddr_in)) }; 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; } static int tcp_do_one(int lnr, char *line) { char local_addr[64], rem_addr[64]; char more[512]; int num, local_port, rem_port, d, state, timer_run, uid, timeout; #if ENABLE_FEATURE_IPV6 struct sockaddr_in6 localaddr, remaddr; #else struct sockaddr_in localaddr, remaddr; #endif unsigned long rxq, txq, time_len, retr, inode; if (lnr == 0) return 0; more[0] = '\0'; num = sscanf(line, "%d: %64[0-9A-Fa-f]:%X %64[0-9A-Fa-f]:%X %X %lX:%lX %X:%lX %lX %d %d %ld %512s\n", &d, local_addr, &local_port, rem_addr, &rem_port, &state, &txq, &rxq, &timer_run, &time_len, &retr, &uid, &timeout, &inode, more); if (num < 10) { return 1; /* error */ } if (strlen(local_addr) > 8) { #if ENABLE_FEATURE_IPV6 build_ipv6_addr(local_addr, &localaddr); build_ipv6_addr(rem_addr, &remaddr); #endif } else { build_ipv4_addr(local_addr, &localaddr); build_ipv4_addr(rem_addr, &remaddr); } if ((rem_port && (flags & NETSTAT_CONNECTED)) || (!rem_port && (flags & NETSTAT_LISTENING)) ) { char *l = ip_port_str( (struct sockaddr *) &localaddr, local_port, "tcp", flags & NETSTAT_NUMERIC); char *r = ip_port_str( (struct sockaddr *) &remaddr, rem_port, "tcp", flags & NETSTAT_NUMERIC); printf(net_conn_line, "tcp", rxq, txq, l, r, tcp_state[state]); free(l); free(r); } return 0; } static int udp_do_one(int lnr, char *line) { char local_addr[64], rem_addr[64]; const char *state_str; char more[512]; int num, local_port, rem_port, d, state, timer_run, uid, timeout; #if ENABLE_FEATURE_IPV6 struct sockaddr_in6 localaddr, remaddr; #else struct sockaddr_in localaddr, remaddr; #endif unsigned long rxq, txq, time_len, retr, inode; if (lnr == 0) return 0; more[0] = '\0'; num = sscanf(line, "%d: %64[0-9A-Fa-f]:%X %64[0-9A-Fa-f]:%X %X %lX:%lX %X:%lX %lX %d %d %ld %512s\n", &d, local_addr, &local_port, rem_addr, &rem_port, &state, &txq, &rxq, &timer_run, &time_len, &retr, &uid, &timeout, &inode, more); if (strlen(local_addr) > 8) { #if ENABLE_FEATURE_IPV6 /* Demangle what the kernel gives us */ build_ipv6_addr(local_addr, &localaddr); build_ipv6_addr(rem_addr, &remaddr); #endif } else { build_ipv4_addr(local_addr, &localaddr); build_ipv4_addr(rem_addr, &remaddr); } if (num < 10) { return 1; /* error */ } switch (state) { case TCP_ESTABLISHED: state_str = "ESTABLISHED"; break; case TCP_CLOSE: state_str = ""; break; default: state_str = "UNKNOWN"; break; } #if ENABLE_FEATURE_IPV6 # define notnull(A) ( \ ( (A.sin6_family == AF_INET6) \ && (A.sin6_addr.s6_addr32[0] | A.sin6_addr.s6_addr32[1] | \ A.sin6_addr.s6_addr32[2] | A.sin6_addr.s6_addr32[3]) \ ) || ( \ (A.sin6_family == AF_INET) \ && ((struct sockaddr_in*)&A)->sin_addr.s_addr \ ) \ ) #else # define notnull(A) (A.sin_addr.s_addr) #endif { int have_remaddr = notnull(remaddr); if ((have_remaddr && (flags & NETSTAT_CONNECTED)) || (!have_remaddr && (flags & NETSTAT_LISTENING)) ) { char *l = ip_port_str( (struct sockaddr *) &localaddr, local_port, "udp", flags & NETSTAT_NUMERIC); char *r = ip_port_str( (struct sockaddr *) &remaddr, rem_port, "udp", flags & NETSTAT_NUMERIC); printf(net_conn_line, "udp", rxq, txq, l, r, state_str); free(l); free(r); } } return 0; } static int raw_do_one(int lnr, char *line) { char local_addr[64], rem_addr[64]; char more[512]; int num, local_port, rem_port, d, state, timer_run, uid, timeout; #if ENABLE_FEATURE_IPV6 struct sockaddr_in6 localaddr, remaddr; #else struct sockaddr_in localaddr, remaddr; #endif unsigned long rxq, txq, time_len, retr, inode; if (lnr == 0) return 0; more[0] = '\0'; num = sscanf(line, "%d: %64[0-9A-Fa-f]:%X %64[0-9A-Fa-f]:%X %X %lX:%lX %X:%lX %lX %d %d %ld %512s\n", &d, local_addr, &local_port, rem_addr, &rem_port, &state, &txq, &rxq, &timer_run, &time_len, &retr, &uid, &timeout, &inode, more); if (strlen(local_addr) > 8) { #if ENABLE_FEATURE_IPV6 build_ipv6_addr(local_addr, &localaddr); build_ipv6_addr(rem_addr, &remaddr); #endif } else { build_ipv4_addr(local_addr, &localaddr); build_ipv4_addr(rem_addr, &remaddr); } if (num < 10) { return 1; /* error */ } { int have_remaddr = notnull(remaddr); if ((have_remaddr && (flags & NETSTAT_CONNECTED)) || (!have_remaddr && (flags & NETSTAT_LISTENING)) ) { char *l = ip_port_str( (struct sockaddr *) &localaddr, local_port, "raw", flags & NETSTAT_NUMERIC); char *r = ip_port_str( (struct sockaddr *) &remaddr, rem_port, "raw", flags & NETSTAT_NUMERIC); printf(net_conn_line, "raw", rxq, txq, l, r, itoa(state)); free(l); free(r); } } return 0; } static int unix_do_one(int nr, char *line) { unsigned long refcnt, proto, unix_flags; unsigned long inode; int type, state; int num, path_ofs; void *d; const char *ss_proto, *ss_state, *ss_type; char ss_flags[32]; /* TODO: currently we stop at first NUL byte. Is it a problem? */ if (nr == 0) return 0; /* skip header */ *strchrnul(line, '\n') = '\0'; /* 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", &d, &refcnt, &proto, &unix_flags, &type, &state, &inode, &path_ofs); if (num < 7) { 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 %-6ld %-11s %-10s %-13s %6lu %s\n", ss_proto, refcnt, ss_flags, ss_type, ss_state, inode, line + path_ofs); return 0; } #define _PATH_PROCNET_UDP "/proc/net/udp" #define _PATH_PROCNET_UDP6 "/proc/net/udp6" #define _PATH_PROCNET_TCP "/proc/net/tcp" #define _PATH_PROCNET_TCP6 "/proc/net/tcp6" #define _PATH_PROCNET_RAW "/proc/net/raw" #define _PATH_PROCNET_RAW6 "/proc/net/raw6" #define _PATH_PROCNET_UNIX "/proc/net/unix" static void do_info(const char *file, const char *name, int (*proc)(int, char *)) { int lnr; FILE *procinfo; char *buffer; procinfo = fopen(file, "r"); if (procinfo == NULL) { if (errno != ENOENT) { bb_simple_perror_msg(file); } else { bb_error_msg("no kernel support for %s", name); } return; } lnr = 0; /* Why? because xmalloc_fgets_str doesn't stop on NULs */ while ((buffer = xmalloc_fgets_str(procinfo, "\n")) != NULL) { if (proc(lnr++, buffer)) bb_error_msg("%s: bogus data on line %d", file, lnr); free(buffer); } fclose(procinfo); } int netstat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int netstat_main(int argc, char **argv) { const char *net_conn_line_header = PRINT_NET_CONN_HEADER; unsigned opt; #if ENABLE_FEATURE_IPV6 smallint inet = 1; smallint inet6 = 1; #else enum { inet = 1, inet6 = 0 }; #endif /* Option string must match NETSTAT_xxx constants */ opt = getopt32(argv, NETSTAT_OPTS); if (opt & 0x1) { // -l flags &= ~NETSTAT_CONNECTED; flags |= NETSTAT_LISTENING; } if (opt & 0x2) flags |= NETSTAT_LISTENING | NETSTAT_CONNECTED; // -a //if (opt & 0x4) // -e if (opt & 0x8) flags |= NETSTAT_NUMERIC; // -n //if (opt & 0x10) // -t: NETSTAT_TCP //if (opt & 0x20) // -u: NETSTAT_UDP //if (opt & 0x40) // -w: NETSTAT_RAW //if (opt & 0x80) // -x: NETSTAT_UNIX if (opt & OPT_showroute) { // -r #if ENABLE_ROUTE bb_displayroutes(flags & NETSTAT_NUMERIC, !(opt & OPT_extended)); return 0; #else bb_show_usage(); #endif } if (opt & OPT_widedisplay) { // -W net_conn_line = PRINT_NET_CONN_WIDE; net_conn_line_header = PRINT_NET_CONN_HEADER_WIDE; } 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(net_conn_line_header, "Local Address", "Foreign Address"); } if (inet && flags & NETSTAT_TCP) do_info(_PATH_PROCNET_TCP, "AF INET (tcp)", tcp_do_one); #if ENABLE_FEATURE_IPV6 if (inet6 && flags & NETSTAT_TCP) do_info(_PATH_PROCNET_TCP6, "AF INET6 (tcp)", tcp_do_one); #endif if (inet && flags & NETSTAT_UDP) do_info(_PATH_PROCNET_UDP, "AF INET (udp)", udp_do_one); #if ENABLE_FEATURE_IPV6 if (inet6 && flags & NETSTAT_UDP) do_info(_PATH_PROCNET_UDP6, "AF INET6 (udp)", udp_do_one); #endif if (inet && flags & NETSTAT_RAW) do_info(_PATH_PROCNET_RAW, "AF INET (raw)", raw_do_one); #if ENABLE_FEATURE_IPV6 if (inet6 && flags & NETSTAT_RAW) do_info(_PATH_PROCNET_RAW6, "AF INET6 (raw)", 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 Path\n"); do_info(_PATH_PROCNET_UNIX, "AF UNIX", unix_do_one); } return 0; }