*
* 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: "[-"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: "\nOptions:"
//usage: IF_ROUTE(
//usage: "\n -r Routing table"
//usage: )
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 *pid_slash_progname,
int depth UNUSED_PARAM)
int depth)
{
const char *pid;
- char *p, *pid_slash_progname;
+ 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 */
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';
+ cmdline_buf[n] = '\0';
- /* go through all files in /proc/PID/fd */
+ /* 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" */
- p = concat_path_file(fileName, "fd");
- i = recursive_action(p, ACTION_RECURSE | ACTION_QUIET,
- file_act, NULL, (void *)pid_slash_progname, 0);
- free(p);
+ 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 (!i)
+ if (!n)
return FALSE; /* signal permissions error to caller */
return SKIP; /* caller should not recurse further into this dir */
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
/* 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);
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,
char *r = ip_port_str(
¶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;
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;
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();
return 0;
}
#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