* 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 tarball for details.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
+//config:config NETSTAT
+//config: bool "netstat (10 kb)"
+//config: default y
+//config: select PLATFORM_LINUX
+//config: help
+//config: netstat prints information about the Linux networking subsystem.
+//config:
+//config:config FEATURE_NETSTAT_WIDE
+//config: bool "Enable wide output"
+//config: default y
+//config: depends on NETSTAT
+//config: help
+//config: Add support for wide columns. Useful when displaying IPv6 addresses
+//config: (-W option).
+//config:
+//config:config FEATURE_NETSTAT_PRG
+//config: bool "Enable PID/Program name output"
+//config: default y
+//config: depends on NETSTAT
+//config: help
+//config: Add support for -p flag to print out PID and program name.
+//config: +700 bytes of code.
+
+//applet:IF_NETSTAT(APPLET(netstat, BB_DIR_BIN, BB_SUID_DROP))
+
+//kbuild:lib-$(CONFIG_NETSTAT) += netstat.o
#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" \
- USE_ROUTE( "r") \
- USE_FEATURE_NETSTAT_WIDE("W") \
- USE_FEATURE_NETSTAT_PRG( "p")
+ IF_ROUTE( "r") \
+ IF_FEATURE_NETSTAT_WIDE("W") \
+ IF_FEATURE_NETSTAT_PRG( "p")
enum {
- OPTBIT_KEEP_OLD = 7,
- USE_ROUTE( OPTBIT_ROUTE,)
- USE_FEATURE_NETSTAT_WIDE(OPTBIT_WIDE ,)
- USE_FEATURE_NETSTAT_PRG( OPTBIT_PRG ,)
OPT_sock_listen = 1 << 0, // l
OPT_sock_all = 1 << 1, // a
OPT_extended = 1 << 2, // e
OPT_sock_udp = 1 << 5, // u
OPT_sock_raw = 1 << 6, // w
OPT_sock_unix = 1 << 7, // x
- OPT_route = USE_ROUTE( (1 << OPTBIT_ROUTE)) + 0, // r
- OPT_wide = USE_FEATURE_NETSTAT_WIDE((1 << OPTBIT_WIDE )) + 0, // W
- OPT_prg = USE_FEATURE_NETSTAT_PRG( (1 << OPTBIT_PRG )) + 0, // p
+ 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
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"
-#define PRINT_NET_CONN_HEADER "\nProto Recv-Q Send-Q %-23s %-23s 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 accomodate for longest possible
+ * 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 PRINT_IP_MAX_SIZE_WIDE 51 /* INET6_ADDRSTRLEN + 5 for the port number */
-#define PRINT_NET_CONN_WIDE "%s %6ld %6ld %-51s %-51s %-12s"
-#define PRINT_NET_CONN_HEADER_WIDE "\nProto Recv-Q Send-Q %-51s %-51s State "
-
+#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"
#define PRG_HASH_SIZE 211
-
struct globals {
- const char *net_conn_line;
- smallint flags;
+ smalluint 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 net_conn_line (G.net_conn_line )
-#define prg_hash (G.prg_hash )
#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; \
- net_conn_line = PRINT_NET_CONN; \
} while (0)
/* Deliberately truncating long to unsigned *int* */
#define PRG_HASHIT(x) ((unsigned)(x) % PRG_HASH_SIZE)
-#define print_progname_banner() do { \
- if (option_mask32 & OPT_prg) printf(PROGNAME_BANNER); \
-} while (0)
-
static void prg_cache_add(long inode, char *name)
{
unsigned hi = PRG_HASHIT(inode);
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 */
+ * as we got multiple processes for one i-node */
return;
}
}
{
long inode = -1;
- if (strncmp(lname, "socket:[", sizeof("socket:[")-1) == 0) {
+ if (is_prefixed_with(lname, "socket:[")) {
/* "socket:[12345]", extract the "12345" as inode */
- inode = bb_strtol(lname + sizeof("socket:[")-1, (char**)&lname, 0);
+ inode = bb_strtoul(lname + sizeof("socket:[")-1, (char**)&lname, 0);
if (*lname != ']')
inode = -1;
- } else if (strncmp(lname, "[0000]:", sizeof("[0000]:")-1) == 0) {
+ } else if (is_prefixed_with(lname, "[0000]:")) {
/* "[0000]:12345", extract the "12345" as inode */
- inode = bb_strtol(lname + sizeof("[0000]:")-1, NULL, 0);
+ inode = bb_strtoul(lname + sizeof("[0000]:")-1, NULL, 0);
if (errno) /* not NUL terminated? */
inode = -1;
}
return inode;
}
-static int FAST_FUNC file_act(const char *fileName,
+static int FAST_FUNC add_to_prg_cache_if_socket(const char *fileName,
struct stat *statbuf UNUSED_PARAM,
- void *userData,
+ void *pid_slash_progname,
int depth UNUSED_PARAM)
{
char *linkname;
inode = extract_socket_inode(linkname);
free(linkname);
if (inode >= 0)
- prg_cache_add(inode, (char *)userData);
+ prg_cache_add(inode, (char *)pid_slash_progname);
}
return TRUE;
}
void *userData UNUSED_PARAM,
int depth)
{
- const char *shortName;
- char *p, *q;
+ const char *pid;
+ char *pid_slash_progname;
+ char proc_pid_fname[sizeof("/proc/%u/cmdline") + sizeof(long)*3];
char cmdline_buf[512];
- int i;
+ int n, len;
if (depth == 0) /* "/proc" itself */
return TRUE; /* continue looking one level below /proc */
- shortName = fileName + sizeof("/proc/")-1; /* point after "/proc/" */
- if (!isdigit(shortName[0])) /* skip /proc entries whic aren't processes */
+ pid = fileName + sizeof("/proc/")-1; /* point after "/proc/" */
+ if (!isdigit(pid[0])) /* skip /proc entries which aren't processes */
return SKIP;
- p = concat_path_file(fileName, "cmdline"); /* "/proc/PID/cmdline" */
- i = open_read_close(p, cmdline_buf, sizeof(cmdline_buf) - 1);
- free(p);
- if (i < 0)
+ 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[i] = '\0';
- q = concat_path_file(shortName, bb_basename(cmdline_buf)); /* "PID/argv0" */
-
- /* go through all files in /proc/PID/fd */
- p = concat_path_file(fileName, "fd");
- i = recursive_action(p, ACTION_RECURSE | ACTION_QUIET,
- file_act, NULL, (void *)q, 0);
-
- free(p);
- free(q);
-
- if (!i)
- return FALSE; /* signal permissions error to caller */
-
- return SKIP; /* caller should not recurse further into this dir. */
+ 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)
return;
if (prg_cache_loaded == 1)
- bb_error_msg("can't scan /proc - are you root?");
+ bb_simple_error_msg("can't scan /proc - are you root?");
else
- bb_error_msg("showing only processes with your user ID");
+ bb_simple_error_msg("showing only processes with your user ID");
}
#else
#define prg_cache_clear() ((void)0)
-#define print_progname_banner() ((void)0)
#endif //ENABLE_FEATURE_NETSTAT_PRG
&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);
+ inet_pton(AF_INET6, addr6, &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;
+ 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)
/* 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 = NULL;
+ if (!numeric)
+ host = xmalloc_sockaddr2host_noport(addr);
+ if (!host)
+ host = xmalloc_sockaddr2dotted_noport(addr);
host_port = xasprintf("%s:%s", host, get_sname(htons(port), proto, numeric));
free(host);
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 localaddr, remaddr;
-#else
- struct sockaddr_in localaddr, remaddr;
+ 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;
- char local_addr[64], rem_addr[64];
+ /* 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: %64[0-9A-Fa-f]:%X "
- "%64[0-9A-Fa-f]:%X %X "
+ "%*d: %32[0-9A-Fa-f]:%X "
+ "%32[0-9A-Fa-f]:%X %X "
"%lX:%lX %*X:%*X "
- "%*X %d %*d %ld ",
+ "%*X %d %*d %lu ",
local_addr, ¶m->local_port,
rem_addr, ¶m->rem_port, ¶m->state,
¶m->txq, ¶m->rxq,
if (strlen(local_addr) > 8) {
#if ENABLE_FEATURE_IPV6
- build_ipv6_addr(local_addr, ¶m->localaddr);
- build_ipv6_addr(rem_addr, ¶m->remaddr);
+ 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);
- build_ipv4_addr(rem_addr, ¶m->remaddr);
+ build_ipv4_addr(local_addr, ¶m->localaddr.sin);
+ build_ipv4_addr(rem_addr, ¶m->remaddr.sin);
}
return 0;
}
|| (!is_connected && (flags & NETSTAT_LISTENING))
) {
char *l = ip_port_str(
- (struct sockaddr *) ¶m->localaddr, param->local_port,
+ ¶m->localaddr.sa, param->local_port,
proto, flags & NETSTAT_NUMERIC);
char *r = ip_port_str(
- (struct sockaddr *) ¶m->remaddr, param->rem_port,
+ ¶m->remaddr.sa, param->rem_port,
proto, flags & NETSTAT_NUMERIC);
- printf(net_conn_line,
- proto, param->rxq, param->txq, l, r, state_str);
+ 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));
{
struct inet_params param;
+ memset(¶m, 0, sizeof(param));
if (scan_inet_proc_line(¶m, line))
return 1;
}
#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 \
- ) \
+# 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 notnull(A) (A.sin_addr.s_addr)
+# define NOT_NULL_ADDR(A) (A.sin.sin_addr.s_addr)
#endif
static int FAST_FUNC udp_do_one(char *line)
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;
break;
}
- have_remaddr = notnull(param.remaddr);
+ have_remaddr = NOT_NULL_ADDR(param.remaddr);
print_inet_line(¶m, state_str, "udp", have_remaddr);
return 0;
}
if (scan_inet_proc_line(¶m, line))
return 1;
- have_remaddr = notnull(param.remaddr);
+ have_remaddr = NOT_NULL_ADDR(param.remaddr);
print_inet_line(¶m, itoa(param.state), "raw", have_remaddr);
return 0;
}
strcat(ss_flags, "N ");
strcat(ss_flags, "]");
- printf("%-5s %-6ld %-11s %-10s %-13s %6lu ",
+ printf("%-5s %-6lu %-11s %-10s %-13s %6lu ",
ss_proto, refcnt, ss_flags, ss_type, ss_state, inode
);
/* TODO: currently we stop at first NUL byte. Is it a problem? */
line += path_ofs;
- *strchrnul(line, '\n') = '\0';
+ chomp(line);
while (*line)
fputc_printable(*line++, stdout);
bb_putchar('\n');
int netstat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int netstat_main(int argc UNUSED_PARAM, char **argv)
{
- const char *net_conn_line_header = PRINT_NET_CONN_HEADER;
unsigned opt;
INIT_G();
/* Option string must match NETSTAT_xxx constants */
opt = getopt32(argv, NETSTAT_OPTS);
- if (opt & 0x1) { // -l
+ if (opt & OPT_sock_listen) { // -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_route) { // -r
+ 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;
-#else
- bb_show_usage();
-#endif
}
+#endif
+#if ENABLE_FEATURE_NETSTAT_WIDE
+ G.addr_width = ADDR_NORMAL_WIDTH;
if (opt & OPT_wide) { // -W
- net_conn_line = PRINT_NET_CONN_WIDE;
- net_conn_line_header = PRINT_NET_CONN_HEADER_WIDE;
+ 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
flags |= opt;
}
if (flags & (NETSTAT_TCP|NETSTAT_UDP|NETSTAT_RAW)) {
- printf("Active Internet connections "); /* xxx */
+ printf("Active Internet connections "); /* xxx */
if ((flags & (NETSTAT_LISTENING|NETSTAT_CONNECTED)) == (NETSTAT_LISTENING|NETSTAT_CONNECTED))
printf("(servers and established)");
printf("(only servers)");
else
printf("(w/o servers)");
- printf(net_conn_line_header, "Local Address", "Foreign Address");
- print_progname_banner();
- bb_putchar('\n');
+ 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);
printf("(only servers)");
else
printf("(w/o servers)");
- printf("\nProto RefCnt Flags Type State I-Node ");
- print_progname_banner();
- printf("Path\n");
+ printf("\nProto RefCnt Flags Type State I-Node %sPath\n", progname_banner);
do_info("/proc/net/unix", unix_do_one);
}
prg_cache_clear();
projects / oweals / busybox.git / blobdiff