1 /* netstat.c - Display Linux networking subsystem.
2 *
3 * Copyright 2012 Ranjan Kumar <ranjankumar.bth@gmail.com>
4 * Copyright 2013 Kyungwan Han <asura321@gmail.com>
5 *
6 * Not in SUSv4.
7 *
8 USE_NETSTAT(NEWTOY(netstat, "pWrxwutneal", TOYFLAG_BIN))
9 config NETSTAT
10 bool "netstat"
11 default n
12 help
13 usage: netstat [-pWrxwutneal]
14
15 Display networking information.
16
17 -r Display routing table.
18 -a Display all sockets (Default: Connected).
19 -l Display listening server sockets.
20 -t Display TCP sockets.
21 -u Display UDP sockets.
22 -w Display Raw sockets.
23 -x Display Unix sockets.
24 -e Display other/more information.
25 -n Don't resolve names.
26 -W Wide Display.
27 -p Display PID/Program name for sockets.
28 */
29
30 #define FOR_netstat
31 #include "toys.h"
32 #include <net/route.h>
33
34 typedef union _iaddr {
35 unsigned u;
36 unsigned char b[4];
37 } iaddr;
38
39 typedef union _iaddr6 {
40 struct {
41 unsigned a;
42 unsigned b;
43 unsigned c;
44 unsigned d;
45 } u;
46 unsigned char b[16];
47 } iaddr6;
48
49 #define ADDR_LEN (INET6_ADDRSTRLEN + 1 + 5 + 1) //IPv6 addr len + : + port + '\0'
50
51 //For unix states
52 enum {
53 SOCK_ACCEPTCON = (1 << 16), //performed a listen.
54 SOCK_WAIT_DATA = (1 << 17), //wait data to read.
55 SOCK_NO_SPACE = (1 << 18), //no space to write.
56 };
57
58 #define SOCK_NOT_CONNECTED 1
59 //For PID/Progrma Name
60 #define PROGRAM_NAME "PID/Program Name"
61 #define PROGNAME_LEN 21
62
63 typedef struct _pidlist {
64 struct _pidlist *next;
65 long inode;
66 char name[PROGNAME_LEN];
67 } PID_LIST;
68 PID_LIST *pid_list = NULL;
69
70 /*
71 * Get base name from the input name.
72 */
get_basename(char * name)73 static const char *get_basename(char *name)
74 {
75 const char *c = strrchr(name, '/');
76 if (c) return c + 1;
77 return name;
78 }
79
80 /*
81 * locate character in string.
82 */
strchr_nul(char * s,int c)83 static char *strchr_nul(char *s, int c)
84 {
85 while(*s != '\0' && *s != c) s++;
86 return (char*)s;
87 }
88
89 // Find out if the last character of a string matches with the given one.
90 // Don't underrun the buffer if the string length is 0.
find_last_char(char * str,int c)91 static char *find_last_char(char *str, int c)
92 {
93 if (str && *str) {
94 size_t sz = strlen(str) - 1;
95 str += sz;
96 if ( (unsigned char)*str == c) return (char*)str;
97 }
98 return NULL;
99 }
100 /*
101 * Concat path and the file name.
102 */
append_pathandfile(char * path,char * fname)103 static char *append_pathandfile(char *path, char *fname)
104 {
105 char *c;
106 if (!path) path = "";
107 c = find_last_char(path, '/');
108 while (*fname == '/') fname++;
109 return xmprintf("%s%s%s", path, (c)? "" : "/", fname);
110 }
111 /*
112 * Concat sub-path and the file name.
113 */
append_subpathandfile(char * path,char * fname)114 static char *append_subpathandfile(char *path, char *fname)
115 {
116 #define ISDOTORDOTDOT(s) ((s)[0] == '.' && (!(s)[1] || ((s)[1] == '.' && !(s)[2])))
117 if(!fname) return NULL;
118 if(ISDOTORDOTDOT(fname)) return NULL;
119 return append_pathandfile(path, fname);
120 #undef ISDOTORDOTDOT
121 }
122 /*
123 * used to converts string into int and validate the input str for invalid int value or out-of-range.
124 */
get_strtou(char * str,char ** endp,int base)125 static unsigned get_strtou(char *str, char **endp, int base)
126 {
127 unsigned long uli;
128 char *endptr;
129
130 if (!isalnum(str[0])) {
131 errno = ERANGE;
132 return UINT_MAX;
133 }
134 errno = 0;
135 uli = strtoul(str, &endptr, base);
136 if (uli > UINT_MAX) {
137 errno = ERANGE;
138 return UINT_MAX;
139 }
140
141 if (endp) *endp = endptr;
142 if (endptr[0]) {
143 if (isalnum(endptr[0]) || errno) { //"123abc" or out-of-range
144 errno = ERANGE;
145 return UINT_MAX;
146 }
147 errno = EINVAL;
148 }
149 return uli;
150 }
151 /*
152 * used to retrive pid name from pid list.
153 */
get_pid_name(unsigned long inode)154 static const char *get_pid_name(unsigned long inode)
155 {
156 PID_LIST *tmp;
157 for (tmp = pid_list; tmp; tmp = tmp->next)
158 if (tmp->inode == inode) return tmp->name;
159 return "-";
160 }
161 /*
162 * For TCP/UDP/RAW display data.
163 */
display_data(unsigned rport,char * label,unsigned rxq,unsigned txq,char * lip,char * rip,unsigned state,unsigned long inode)164 static void display_data(unsigned rport, char *label, unsigned rxq, unsigned txq, char *lip, char *rip, unsigned state, unsigned long inode)
165 {
166 char *ss_state = "UNKNOWN", buf[12];
167 char *state_label[] = {"", "ESTABLISHED", "SYN_SENT", "SYN_RECV", "FIN_WAIT1", "FIN_WAIT2",
168 "TIME_WAIT", "CLOSE", "CLOSE_WAIT", "LAST_ACK", "LISTEN", "CLOSING", "UNKNOWN"};
169 if (!strcmp(label, "tcp")) {
170 int sz = ARRAY_LEN(state_label);
171 if (!state || state >= sz) state = sz-1;
172 ss_state = state_label[state];
173 }
174 else if (!strcmp(label, "udp")) {
175 if (state == 1) ss_state = state_label[state];
176 else if (state == 7) ss_state = "";
177 }
178 else if (!strcmp(label, "raw")) sprintf(ss_state = buf, "%u", state);
179
180 if ( (toys.optflags & FLAG_W) && (toys.optflags & FLAG_p))
181 xprintf("%3s %6d %6d %-51s %-51s %-12s%s\n", label, rxq, txq, lip, rip, ss_state, get_pid_name(inode));
182 else if (toys.optflags & FLAG_W)
183 xprintf("%3s %6d %6d %-51s %-51s %-12s\n", label, rxq, txq, lip, rip, ss_state);
184 else if (toys.optflags & FLAG_p)
185 xprintf("%3s %6d %6d %-23s %-23s %-12s%s\n", label, rxq, txq, lip, rip, ss_state, get_pid_name(inode));
186 else xprintf("%3s %6d %6d %-23s %-23s %-12s\n", label, rxq, txq, lip, rip, ss_state);
187 }
188 /*
189 * For TCP/UDP/RAW show data.
190 */
show_data(unsigned rport,char * label,unsigned rxq,unsigned txq,char * lip,char * rip,unsigned state,unsigned long inode)191 static void show_data(unsigned rport, char *label, unsigned rxq, unsigned txq, char *lip, char *rip, unsigned state, unsigned long inode)
192 {
193 if (toys.optflags & FLAG_l) {
194 if (!rport && (state && 0xA)) display_data(rport, label, rxq, txq, lip, rip, state, inode);
195 } else if (toys.optflags & FLAG_a) display_data(rport, label, rxq, txq, lip, rip, state, inode);
196 //rport && (TCP | UDP | RAW)
197 else if (rport && (0x10 | 0x20 | 0x40)) display_data(rport, label, rxq, txq, lip, rip, state, inode);
198 }
199 /*
200 * used to get service name.
201 */
get_servname(int port,char * label)202 static char *get_servname(int port, char *label)
203 {
204 int lport = htons(port);
205 if (!lport) return xmprintf("%s", "*");
206 struct servent *ser = getservbyport(lport, label);
207 if (ser) return xmprintf("%s", ser->s_name);
208 return xmprintf("%u", (unsigned)ntohs(lport));
209 }
210 /*
211 * used to convert address into text format.
212 */
addr2str(int af,void * addr,unsigned port,char * buf,char * label)213 static void addr2str(int af, void *addr, unsigned port, char *buf, char *label)
214 {
215 char ip[ADDR_LEN] = {0,};
216 if (!inet_ntop(af, addr, ip, ADDR_LEN)) {
217 *buf = '\0';
218 return;
219 }
220 size_t iplen = strlen(ip);
221 if (!port) {
222 strncat(ip+iplen, ":*", ADDR_LEN-iplen-1);
223 memcpy(buf, ip, ADDR_LEN);
224 return;
225 }
226
227 if (!(toys.optflags & FLAG_n)) {
228 struct addrinfo hints, *result, *rp;
229
230 memset(&hints, 0, sizeof(struct addrinfo));
231 hints.ai_family = af;
232
233 if (!getaddrinfo(ip, NULL, &hints, &result)) {
234 char hbuf[NI_MAXHOST] = {0,}, sbuf[NI_MAXSERV] = {0,};
235 socklen_t sock_len;
236 char *sname = NULL;
237 int plen = 0;
238
239 if (af == AF_INET) sock_len = sizeof(struct sockaddr_in);
240 else sock_len = sizeof(struct sockaddr_in6);
241
242 for (rp = result; rp; rp = rp->ai_next)
243 if (!getnameinfo(rp->ai_addr, sock_len, hbuf, sizeof(hbuf), sbuf, sizeof(sbuf), NI_NUMERICSERV))
244 break;
245
246 freeaddrinfo(result);
247 sname = get_servname(port, label);
248 plen = strlen(sname);
249 if (*hbuf) {
250 memset(ip, 0, ADDR_LEN);
251 memcpy(ip, hbuf, (ADDR_LEN - plen - 2));
252 iplen = strlen(ip);
253 }
254 snprintf(ip + iplen, ADDR_LEN-iplen, ":%s", sname);
255 free(sname);
256 }
257 }
258 else snprintf(ip+iplen, ADDR_LEN-iplen, ":%d", port);
259 memcpy(buf, ip, ADDR_LEN);
260 }
261 /*
262 * display ipv4 info for TCP/UDP/RAW.
263 */
show_ipv4(char * fname,char * label)264 static void show_ipv4(char *fname, char *label)
265 {
266 FILE *fp = fopen((char *)fname, "r");
267 if (!fp) {
268 perror_msg("'%s'", fname);
269 return;
270 }
271 fgets(toybuf, sizeof(toybuf), fp); //skip header.
272 while (fgets(toybuf, sizeof(toybuf), fp)) {
273 char lip[ADDR_LEN] = {0,}, rip[ADDR_LEN] = {0,};
274 iaddr laddr, raddr;
275 unsigned lport, rport, state, txq, rxq, num, uid;
276 unsigned long inode;
277
278 int nitems = sscanf(toybuf, " %d: %x:%x %x:%x %x %x:%x %*X:%*X %*X %d %*d %ld",
279 &num, &laddr.u, &lport, &raddr.u, &rport, &state, &txq, &rxq, &uid, &inode);
280 if (nitems == 10) {
281 addr2str(AF_INET, &laddr, lport, lip, label);
282 addr2str(AF_INET, &raddr, rport, rip, label);
283 show_data(rport, label, rxq, txq, lip, rip, state, inode);
284 }
285 }//End of While
286 fclose(fp);
287 }
288 /*
289 * display ipv6 info for TCP/UDP/RAW.
290 */
show_ipv6(char * fname,char * label)291 static void show_ipv6(char *fname, char *label)
292 {
293 FILE *fp = fopen((char *)fname, "r");
294 if (!fp) {
295 perror_msg("'%s'", fname);
296 return;
297 }
298 fgets(toybuf, sizeof(toybuf), fp); //skip header.
299 while (fgets(toybuf, sizeof(toybuf), fp)) {
300 char lip[ADDR_LEN] = {0,}, rip[ADDR_LEN] = {0,};
301 iaddr6 laddr6, raddr6;
302 unsigned lport, rport, state, txq, rxq, num, uid;
303 unsigned long inode;
304 int nitems = sscanf(toybuf, " %d: %8x%8x%8x%8x:%x %8x%8x%8x%8x:%x %x %x:%x %*X:%*X %*X %d %*d %ld",
305 &num, &laddr6.u.a, &laddr6.u.b, &laddr6.u.c, &laddr6.u.d, &lport, &raddr6.u.a, &raddr6.u.b,
306 &raddr6.u.c, &raddr6.u.d, &rport, &state, &txq, &rxq, &uid, &inode);
307 if (nitems == 16) {
308 addr2str(AF_INET6, &laddr6, lport, lip, label);
309 addr2str(AF_INET6, &raddr6, rport, rip, label);
310 show_data(rport, label, rxq, txq, lip, rip, state, inode);
311 }
312 }//End of While
313 fclose(fp);
314 }
315 /*
316 * display unix socket info.
317 */
show_unix_sockets(char * fname,char * label)318 static void show_unix_sockets(char *fname, char *label)
319 {
320 FILE *fp = fopen((char *)fname, "r");
321 if (!fp) {
322 perror_msg("'%s'", fname);
323 return;
324 }
325 fgets(toybuf, sizeof(toybuf), fp); //skip header.
326 while (fgets(toybuf, sizeof(toybuf), fp)) {
327 unsigned long int refcount, label, flags, inode;
328 int nitems = 0, path_offset = 0, type, state;
329 char sock_flags[32] = {0,}, *sock_type, *sock_state, *bptr = toybuf;
330
331 if (!toybuf[0]) continue;
332 nitems = sscanf(toybuf, "%*p: %lX %lX %lX %X %X %lu %n",
333 &refcount, &label, &flags, &type, &state, &inode, &path_offset);
334 //for state one less
335 if (nitems < 6) break;
336 if (toys.optflags & FLAG_l) {
337 if ( !((state == SOCK_NOT_CONNECTED) && (flags & SOCK_ACCEPTCON)) ) continue;
338 } else if (!(toys.optflags & FLAG_a)) {
339 if ((state == SOCK_NOT_CONNECTED) && (flags & SOCK_ACCEPTCON)) continue;
340 }
341
342 //prepare socket type, state and flags.
343 {
344 char *ss_type[] = { "", "STREAM", "DGRAM", "RAW", "RDM", "SEQPACKET", "UNKNOWN"};
345 char *ss_state[] = { "FREE", "LISTENING", "CONNECTING", "CONNECTED", "DISCONNECTING", "UNKNOWN"};
346
347 int sz = ARRAY_LEN(ss_type);//sizeof(ss_type)/sizeof(ss_type[0]);
348 if ( (type < SOCK_STREAM) || (type > SOCK_SEQPACKET) ) sock_type = ss_type[sz-1];
349 else sock_type = ss_type[type];
350
351 sz = ARRAY_LEN(ss_state);//sizeof(ss_state)/sizeof(ss_state[0]);
352 if ((state < 0) || (state > sz-2)) sock_state = ss_state[sz-1];
353 else if (state == SOCK_NOT_CONNECTED) {
354 if (flags & SOCK_ACCEPTCON) sock_state = ss_state[state];
355 else sock_state = " ";
356 } else sock_state = ss_state[state];
357
358 strcpy(sock_flags, "[ ");
359 if (flags & SOCK_ACCEPTCON) strcat(sock_flags, "ACC ");
360 if (flags & SOCK_WAIT_DATA) strcat(sock_flags, "W ");
361 if (flags & SOCK_NO_SPACE) strcat(sock_flags, "N ");
362 strcat(sock_flags, "]");
363 }
364 xprintf("%-5s %-6ld %-11s %-10s %-13s %6lu ", (!label ? "unix" : "??"), refcount, sock_flags, sock_type, sock_state, inode);
365 if (toys.optflags & FLAG_p) xprintf("%-20s", get_pid_name(inode));
366
367 bptr += path_offset;
368 *strchr_nul(bptr, '\n') = '\0';
369 xprintf("%s\n", bptr);
370 }//End of while
371 fclose(fp);
372 }
373 /*
374 * extract inode value from the link.
375 */
ss_inode(char * link)376 static long ss_inode(char *link)
377 {
378 long inode = -1;
379 //"link = socket:[12345]", get "12345" as inode.
380 if (!strncmp(link, "socket:[", sizeof("socket:[")-1)) {
381 inode = get_strtou(link + sizeof("socket:[")-1, (char**)&link, 0);
382 if (*link != ']') inode = -1;
383 }
384 //"link = [0000]:12345", get "12345" as inode.
385 else if (!strncmp(link, "[0000]:", sizeof("[0000]:")-1)) {
386 inode = get_strtou(link + sizeof("[0000]:")-1, NULL, 0);
387 //if not NULL terminated.
388 if (errno) inode = -1;
389 }
390 return inode;
391 }
392 /*
393 * add inode and progname in the pid list.
394 */
add2list(long inode,char * progname)395 static void add2list(long inode, char *progname)
396 {
397 PID_LIST *node = pid_list;
398 for(; node; node = node->next) {
399 if(node->inode == inode)
400 return;
401 }
402 PID_LIST *new = (PID_LIST *)xzalloc(sizeof(PID_LIST));
403 new->inode = inode;
404 xstrncpy(new->name, progname, PROGNAME_LEN);
405 new->next = pid_list;
406 pid_list = new;
407 }
408 /*
409 * add pid info in the list.
410 */
extract_inode(char * path,char * progname)411 static void extract_inode(char *path, char *progname)
412 {
413 DIR *dp;
414 struct dirent *entry;
415
416 if (!(dp = opendir(path))) {
417 if (errno == EACCES) return;
418 else perror_exit("%s", path);
419 }
420 while ((entry = readdir(dp))) {
421 char *link = NULL, *fname = append_subpathandfile(path, entry->d_name);
422 if (!fname) continue;
423 link = xreadlink(fname);
424 if (link) {
425 long inode = ss_inode(link);
426 free(link);
427 if (inode != -1) add2list(inode, progname);
428 }
429 free(fname);
430 }//end of while.
431 closedir(dp);
432 }
433 /*
434 * prepare the list for all pids in /proc directory.
435 */
get_pid_list(void)436 static void get_pid_list(void)
437 {
438 DIR *dp;
439 struct dirent *entry;
440 char path[64] = {0,};
441 uid_t uid = geteuid();
442
443 if (!(dp = opendir("/proc"))) perror_exit("opendir");
444
445 while ((entry = readdir(dp))) {
446 int fd, nitems = 0, length = 0;
447 char *pid, *progname;
448
449 if (!isdigit(*entry->d_name)) continue;
450 pid = entry->d_name;
451 length = snprintf(path, sizeof(path), "/proc/%s/cmdline", entry->d_name);
452 if (sizeof(path) <= length) continue;
453
454 fd = xopen(path, O_RDONLY);
455 nitems = readall(fd, toybuf, sizeof(toybuf) - 1);
456 xclose(fd);
457 if (nitems < 1) continue;
458 toybuf[nitems] = '\0';
459 strcpy(path + length - (sizeof("cmdline")-1), "fd");
460 progname = append_pathandfile(pid, (char *)get_basename(toybuf)); //e.g. progname = 2054/gnome-keyring-daemon
461 extract_inode(path, progname);
462 free(progname);
463 }//end of while.
464 closedir(dp);
465
466 if (uid) fprintf(stderr, "(Not all processes could be identified, non-owned process info "
467 "will not be shown, you would have to be root to see it all.)\n");
468 }
469 /*
470 * Dealloc pid list.
471 */
clean_pid_list(void)472 static void clean_pid_list(void)
473 {
474 PID_LIST *tmp;
475 while (pid_list) {
476 tmp = pid_list->next;
477 free(pid_list);
478 pid_list = tmp;
479 }
480 }
481 /*
482 * For TCP/UDP/RAW show the header.
483 */
show_header(void)484 static void show_header(void)
485 {
486 if ((toys.optflags & FLAG_W) && (toys.optflags & FLAG_p))
487 xprintf("\nProto Recv-Q Send-Q %-51s %-51s %-12s%s\n", "Local Address", "Foreign Address", "State", PROGRAM_NAME);
488 else if (toys.optflags & FLAG_p)
489 xprintf("\nProto Recv-Q Send-Q %-23s %-23s %-12s%s\n", "Local Address", "Foreign Address", "State", PROGRAM_NAME);
490 else if (toys.optflags & FLAG_W)
491 xprintf("\nProto Recv-Q Send-Q %-51s %-51s State \n", "Local Address", "Foreign Address");
492 else xprintf("\nProto Recv-Q Send-Q %-23s %-23s State \n", "Local Address", "Foreign Address");
493 }
494 /*
495 * used to get the flag values for route command.
496 */
get_flag_value(char ** flagstr,int flags)497 static void get_flag_value(char **flagstr, int flags)
498 {
499 int i = 0;
500 char *str = *flagstr;
501 static const char flagchars[] = "GHRDMDAC";
502 static const unsigned flagarray[] = {
503 RTF_GATEWAY,
504 RTF_HOST,
505 RTF_REINSTATE,
506 RTF_DYNAMIC,
507 RTF_MODIFIED,
508 RTF_DEFAULT,
509 RTF_ADDRCONF,
510 RTF_CACHE
511 };
512 *str++ = 'U';
513 while ( (*str = flagchars[i]) ) {
514 if (flags & flagarray[i++]) ++str;
515 }
516 }
517 /*
518 * extract inet4 route info from /proc/net/route file and display it.
519 */
display_routes(int is_more_info,int notresolve)520 static void display_routes(int is_more_info, int notresolve)
521 {
522 #define IPV4_MASK (RTF_GATEWAY|RTF_HOST|RTF_REINSTATE|RTF_DYNAMIC|RTF_MODIFIED)
523 unsigned long dest, gate, mask;
524 int flags, ref, use, metric, mss, win, irtt;
525 char iface[64]={0,};
526 char *flag_val = xzalloc(10); //there are 9 flags "UGHRDMDAC" for route.
527
528 FILE *fp = xfopen("/proc/net/route", "r");
529 xprintf("Kernel IP routing table\n"
530 "Destination Gateway Genmask Flags %s Iface\n",
531 is_more_info ? " MSS Window irtt" : "Metric Ref Use");
532 fgets(toybuf, sizeof(toybuf), fp); //skip 1st line.
533 while (fgets(toybuf, sizeof(toybuf), fp)) {
534 int nitems = 0;
535 char *destip = NULL, *gateip = NULL, *maskip = NULL;
536 memset(flag_val, 0, 10);
537
538 nitems = sscanf(toybuf, "%63s%lx%lx%X%d%d%d%lx%d%d%d\n",
539 iface, &dest, &gate, &flags, &ref, &use, &metric, &mask, &mss, &win, &irtt);
540 if (nitems != 11) {//EOF with no (nonspace) chars read.
541 if ((nitems < 0) && feof(fp)) break;
542 perror_exit("sscanf");
543 }
544 //skip down interfaces.
545 if (!(flags & RTF_UP)) continue;
546
547 if (dest) {//For Destination
548 if (inet_ntop(AF_INET, &dest, toybuf, sizeof(toybuf)) ) destip = xstrdup(toybuf);
549 } else {
550 if (!notresolve) destip = xstrdup("default");
551 else destip = xstrdup("0.0.0.0");
552 }
553 if (gate) {//For Gateway
554 if (inet_ntop(AF_INET, &gate, toybuf, sizeof(toybuf)) ) gateip = xstrdup(toybuf);
555 } else {
556 if (!notresolve) gateip = xstrdup("*");
557 else gateip = xstrdup("0.0.0.0");
558 }
559 //For Mask
560 if (inet_ntop(AF_INET, &mask, toybuf, sizeof(toybuf)) ) maskip = xstrdup(toybuf);
561
562 //Get flag Values
563 get_flag_value(&flag_val, (flags & IPV4_MASK));
564 if (flags & RTF_REJECT) flag_val[0] = '!';
565 xprintf("%-15.15s %-15.15s %-16s%-6s", destip, gateip, maskip, flag_val);
566 if (destip) free(destip);
567 if (gateip) free(gateip);
568 if (maskip) free(maskip);
569 if (is_more_info) xprintf("%5d %-5d %6d %s\n", mss, win, irtt, iface);
570 else xprintf("%-6d %-2d %7d %s\n", metric, ref, use, iface);
571 }//end of while.
572 fclose(fp);
573 if (flag_val) free(flag_val);
574 #undef IPV4_MASK
575 return;
576 }
577 /*
578 * netstat utily main function.
579 */
netstat_main(void)580 void netstat_main(void)
581 {
582 #define IS_NETSTAT_PROTO_FLAGS_UP (toys.optflags & (FLAG_t | FLAG_u | FLAG_w | FLAG_x))
583 int flag_listen_and_all = 0;
584 if (!toys.optflags) toys.optflags = FLAG_t | FLAG_u | FLAG_w | FLAG_x;
585
586 //When a is set
587 if (toys.optflags & FLAG_a) flag_listen_and_all = 1;
588 //when a and l both are set
589 if ( (toys.optflags & FLAG_a) && (toys.optflags & FLAG_l) )
590 toys.optflags &= ~FLAG_l;
591 //when only a is set
592 if ( (toys.optflags & FLAG_a) && (!IS_NETSTAT_PROTO_FLAGS_UP) )
593 toys.optflags |= FLAG_t | FLAG_u | FLAG_w | FLAG_x;
594 //when only l is set
595 if ( (toys.optflags & FLAG_l) && (!IS_NETSTAT_PROTO_FLAGS_UP) )
596 toys.optflags |= FLAG_t | FLAG_u | FLAG_w | FLAG_x;
597 //when only e/n is set
598 if( ((toys.optflags & FLAG_e) || (toys.optflags & FLAG_n)) && (!IS_NETSTAT_PROTO_FLAGS_UP) )
599 toys.optflags |= FLAG_t | FLAG_u | FLAG_w | FLAG_x;
600 //when W is set
601 if ( (toys.optflags & FLAG_W) && (!IS_NETSTAT_PROTO_FLAGS_UP) )
602 toys.optflags |= FLAG_t | FLAG_u | FLAG_w | FLAG_x;
603 //when p is set
604 if ( (toys.optflags & FLAG_p) && (!IS_NETSTAT_PROTO_FLAGS_UP) )
605 toys.optflags |= FLAG_t | FLAG_u | FLAG_w | FLAG_x;
606
607 //Display routing table.
608 if (toys.optflags & FLAG_r) {
609 display_routes(!(toys.optflags & FLAG_e), (toys.optflags & FLAG_n));
610 return;
611 }
612
613 if (toys.optflags & FLAG_p) get_pid_list();
614
615 //For TCP/UDP/RAW.
616 if ( (toys.optflags & FLAG_t) || (toys.optflags & FLAG_u) || (toys.optflags & FLAG_w) ) {
617 xprintf("Active Internet connections ");
618
619 if (flag_listen_and_all) xprintf("(servers and established)");
620 else if (toys.optflags & FLAG_l) xprintf("(only servers)");
621 else xprintf("(w/o servers)");
622
623 show_header();
624 if (toys.optflags & FLAG_t) {//For TCP
625 show_ipv4("/proc/net/tcp", "tcp");
626 show_ipv6("/proc/net/tcp6", "tcp");
627 }
628 if (toys.optflags & FLAG_u) {//For UDP
629 show_ipv4("/proc/net/udp", "udp");
630 show_ipv6("/proc/net/udp6", "udp");
631 }
632 if (toys.optflags & FLAG_w) {//For raw
633 show_ipv4("/proc/net/raw", "raw");
634 show_ipv6("/proc/net/raw6", "raw");
635 }
636 }
637 if (toys.optflags & FLAG_x) {//For UNIX.
638 xprintf("Active UNIX domain sockets ");
639 if (flag_listen_and_all) xprintf("(servers and established)");
640 else if (toys.optflags & FLAG_l) xprintf("(only servers)");
641 else xprintf("(w/o servers)");
642
643 if (toys.optflags & FLAG_p) xprintf("\nProto RefCnt Flags Type State I-Node %s Path\n", PROGRAM_NAME);
644 else xprintf("\nProto RefCnt Flags Type State I-Node Path\n");
645 show_unix_sockets("/proc/net/unix", "unix");
646 }
647 if (toys.optflags & FLAG_p) clean_pid_list();
648 if (toys.exitval) toys.exitval = 0;
649 #undef IS_NETSTAT_PROTO_FLAGS_UP
650 }
651