/* 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 "busybox.h" #include "inet_common.h" #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 int 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 */ static const char *get_sname(int port, const char *proto, int num) { /* hummm, we return static buffer here!! */ const char *str = itoa(ntohs(port)); if (!num) { struct servent *se = getservbyport(port, proto); if (se) str = se->s_name; } if (!port) { str = "*"; } return str; } static void snprint_ip_port(char *ip_port, int size, struct sockaddr *addr, int port, const char *proto, int numeric) { const char *port_name; #if ENABLE_FEATURE_IPV6 if (addr->sa_family == AF_INET6) { INET6_rresolve(ip_port, size, (struct sockaddr_in6 *)addr, (numeric & NETSTAT_NUMERIC) ? 0x0fff : 0); } else #endif { INET_rresolve(ip_port, size, (struct sockaddr_in *)addr, 0x4000 | ((numeric & NETSTAT_NUMERIC) ? 0x0fff : 0), 0xffffffff); } port_name = get_sname(htons(port), proto, numeric); if ((strlen(ip_port) + strlen(port_name)) > 22) ip_port[22 - strlen(port_name)] = '\0'; ip_port += strlen(ip_port); strcat(ip_port, ":"); strcat(ip_port, port_name); } static void tcp_do_one(int lnr, const 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; char addr6[INET6_ADDRSTRLEN]; struct in6_addr in6; #else struct sockaddr_in localaddr, remaddr; #endif unsigned long rxq, txq, time_len, retr, inode; if (lnr == 0) return; 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 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); sscanf(rem_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 *) &remaddr.sin6_addr); localaddr.sin6_family = AF_INET6; remaddr.sin6_family = AF_INET6; #endif } else { sscanf(local_addr, "%X", &((struct sockaddr_in *) &localaddr)->sin_addr.s_addr); sscanf(rem_addr, "%X", &((struct sockaddr_in *) &remaddr)->sin_addr.s_addr); ((struct sockaddr *) &localaddr)->sa_family = AF_INET; ((struct sockaddr *) &remaddr)->sa_family = AF_INET; } if (num < 10) { bb_error_msg("warning, got bogus tcp line"); return; } state_str = tcp_state[state]; if ((rem_port && (flags & NETSTAT_CONNECTED)) || (!rem_port && (flags & NETSTAT_LISTENING)) ) { snprint_ip_port(local_addr, sizeof(local_addr), (struct sockaddr *) &localaddr, local_port, "tcp", flags & NETSTAT_NUMERIC); snprint_ip_port(rem_addr, sizeof(rem_addr), (struct sockaddr *) &remaddr, rem_port, "tcp", flags & NETSTAT_NUMERIC); printf("tcp %6ld %6ld %-23s %-23s %-12s\n", rxq, txq, local_addr, rem_addr, state_str); } } static void udp_do_one(int lnr, const 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; char addr6[INET6_ADDRSTRLEN]; struct in6_addr in6; #else struct sockaddr_in localaddr, remaddr; #endif unsigned long rxq, txq, time_len, retr, inode; if (lnr == 0) return; 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 */ 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); sscanf(rem_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 *) &remaddr.sin6_addr); localaddr.sin6_family = AF_INET6; remaddr.sin6_family = AF_INET6; #endif } else { sscanf(local_addr, "%X", &((struct sockaddr_in *) &localaddr)->sin_addr.s_addr); sscanf(rem_addr, "%X", &((struct sockaddr_in *) &remaddr)->sin_addr.s_addr); ((struct sockaddr *) &localaddr)->sa_family = AF_INET; ((struct sockaddr *) &remaddr)->sa_family = AF_INET; } if (num < 10) { bb_error_msg("warning, got bogus udp line"); return; } 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 if ((notnull(remaddr) && (flags & NETSTAT_CONNECTED)) || (!notnull(remaddr) && (flags & NETSTAT_LISTENING)) ) { snprint_ip_port(local_addr, sizeof(local_addr), (struct sockaddr *) &localaddr, local_port, "udp", flags & NETSTAT_NUMERIC); snprint_ip_port(rem_addr, sizeof(rem_addr), (struct sockaddr *) &remaddr, rem_port, "udp", flags & NETSTAT_NUMERIC); printf("udp %6ld %6ld %-23s %-23s %-12s\n", rxq, txq, local_addr, rem_addr, state_str); } } static void raw_do_one(int lnr, const char *line) { char local_addr[64], rem_addr[64]; char *state_str, more[512]; int num, local_port, rem_port, d, state, timer_run, uid, timeout; #if ENABLE_FEATURE_IPV6 struct sockaddr_in6 localaddr, remaddr; char addr6[INET6_ADDRSTRLEN]; struct in6_addr in6; #else struct sockaddr_in localaddr, remaddr; #endif unsigned long rxq, txq, time_len, retr, inode; if (lnr == 0) return; 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 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); sscanf(rem_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 *) &remaddr.sin6_addr); localaddr.sin6_family = AF_INET6; remaddr.sin6_family = AF_INET6; #endif } else { sscanf(local_addr, "%X", &((struct sockaddr_in *) &localaddr)->sin_addr.s_addr); sscanf(rem_addr, "%X", &((struct sockaddr_in *) &remaddr)->sin_addr.s_addr); ((struct sockaddr *) &localaddr)->sa_family = AF_INET; ((struct sockaddr *) &remaddr)->sa_family = AF_INET; } if (num < 10) { bb_error_msg("warning, got bogus raw line"); return; } state_str = itoa(state); #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 if ((notnull(remaddr) && (flags & NETSTAT_CONNECTED)) || (!notnull(remaddr) && (flags & NETSTAT_LISTENING)) ) { snprint_ip_port(local_addr, sizeof(local_addr), (struct sockaddr *) &localaddr, local_port, "raw", flags & NETSTAT_NUMERIC); snprint_ip_port(rem_addr, sizeof(rem_addr), (struct sockaddr *) &remaddr, rem_port, "raw", flags & NETSTAT_NUMERIC); printf("raw %6ld %6ld %-23s %-23s %-12s\n", rxq, txq, local_addr, rem_addr, state_str); } } #define HAS_INODE 1 static void unix_do_one(int nr, const char *line) { static int has = 0; char path[PATH_MAX], ss_flags[32]; const char *ss_proto, *ss_state, *ss_type; int num, state, type, inode; void *d; unsigned long refcnt, proto, unix_flags; if (nr == 0) { if (strstr(line, "Inode")) has |= HAS_INODE; return; } path[0] = '\0'; num = sscanf(line, "%p: %lX %lX %lX %X %X %d %s", &d, &refcnt, &proto, &unix_flags, &type, &state, &inode, path); if (num < 6) { bb_error_msg("warning, got bogus unix line"); return; } if (!(has & HAS_INODE)) snprintf(path,sizeof(path),"%d",inode); if ((flags & (NETSTAT_LISTENING|NETSTAT_CONNECTED)) != (NETSTAT_LISTENING|NETSTAT_CONNECTED)) { if ((state == SS_UNCONNECTED) && (unix_flags & SO_ACCEPTCON)) { if (!(flags & NETSTAT_LISTENING)) return; } else { if (!(flags & NETSTAT_CONNECTED)) return; } } 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 ", ss_proto, refcnt, ss_flags, ss_type, ss_state); if (has & HAS_INODE) printf("%-6d ",inode); else printf("- "); puts(path); } #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, void (*proc)(int, const char *)) { int lnr = 0; FILE *procinfo; procinfo = fopen(file, "r"); if (procinfo == NULL) { if (errno != ENOENT) { bb_perror_msg("%s", file); } else { bb_error_msg("no support for '%s' on this system", name); } return; } do { char *buffer = xmalloc_fgets(procinfo); if (buffer) { (proc)(lnr++, buffer); free(buffer); } } while (!feof(procinfo)); fclose(procinfo); } /* * Our main function. */ int netstat_main(int argc, char **argv); int netstat_main(int argc, char **argv) { enum { OPT_extended = 0x4, OPT_showroute = 0x100, }; unsigned opt; #if ENABLE_FEATURE_IPV6 int inet = 1; int inet6 = 1; #else enum { inet = 1, inet6 = 0 }; #endif /* Option string must match NETSTAT_xxx constants */ opt = getopt32(argc, argv, "laentuwxr"); 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_error_msg_and_die("-r (display routing table) is not compiled in"); #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("\nProto Recv-Q Send-Q Local Address Foreign Address State\n"); } 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; }