diff options
Diffstat (limited to 'toys/net/netstat.c')
| -rw-r--r-- | toys/net/netstat.c | 383 |
1 files changed, 383 insertions, 0 deletions
diff --git a/toys/net/netstat.c b/toys/net/netstat.c new file mode 100644 index 00000000..4e5c884e --- /dev/null +++ b/toys/net/netstat.c @@ -0,0 +1,383 @@ +/* netstat.c - Display Linux networking subsystem. + * + * Copyright 2012 Ranjan Kumar <ranjankumar.bth@gmail.com> + * Copyright 2013 Kyungwan Han <asura321@gmail.com> + * + * Not in SUSv4. + * +USE_NETSTAT(NEWTOY(netstat, "pWrxwutneal", TOYFLAG_BIN)) +config NETSTAT + bool "netstat" + default y + help + usage: netstat [-pWrxwutneal] + + Display networking information. Default is netsat -tuwx + + -r routing table + -a all sockets (not just connected) + -l listening server sockets + -t TCP sockets + -u UDP sockets + -w raw sockets + -x unix sockets + -e extended info + -n don't resolve names + -W wide display + -p PID/Program name of sockets +*/ + +#define FOR_netstat +#include "toys.h" +#include <net/route.h> + +GLOBALS( + struct num_cache *inodes; + int wpad; +); + +// convert address into text format. +static void addr2str(int af, void *addr, unsigned port, char *buf, int len, + char *proto) +{ + int pos, count; + struct servent *ser = 0; + + // Convert to numeric address + if (!inet_ntop(af, addr, buf, 256)) { + *buf = 0; + + return; + } + buf[len] = 0; + pos = strlen(buf); + + // If there's no port number, it's a local :* binding, nothing to look up. + if (!port) { + if (len-pos<2) pos = len-2; + strcpy(buf+pos, ":*"); + + return; + } + + if (!(toys.optflags & FLAG_n)) { + struct addrinfo hints, *result, *rp; + char cut[4]; + + memset(&hints, 0, sizeof(struct addrinfo)); + hints.ai_family = af; + + if (!getaddrinfo(buf, NULL, &hints, &result)) { + socklen_t sock_len = (af == AF_INET) ? sizeof(struct sockaddr_in) + : sizeof(struct sockaddr_in6); + + // We assume that a failing getnameinfo dosn't stomp "buf" here. + for (rp = result; rp; rp = rp->ai_next) + if (!getnameinfo(rp->ai_addr, sock_len, buf, 256, 0, 0, 0)) break; + freeaddrinfo(result); + buf[len] = 0; + pos = strlen(buf); + } + + // Doesn't understand proto "tcp6", so truncate + memcpy(cut, proto, 3); + cut[3] = 0; + ser = getservbyport(htons(port), cut); + } + + // Append :service + count = snprintf(0, 0, ":%u", port); + if (ser) { + count = snprintf(0, 0, ":%s", ser->s_name); + // sheer paranoia + if (count>=len) { + count = len-1; + ser->s_name[count] = 0; + } + } + if (len-pos<count) pos = len-count; + if (ser) sprintf(buf+pos, ":%s", ser->s_name); + else sprintf(buf+pos, ":%u", port); +} + +// Display info for tcp/udp/raw +static void show_ip(char *fname) +{ + char *ss_state = "UNKNOWN", buf[12], *s, *label = strrchr(fname, '/')+1; + char *state_label[] = {"", "ESTABLISHED", "SYN_SENT", "SYN_RECV", "FIN_WAIT1", + "FIN_WAIT2", "TIME_WAIT", "CLOSE", "CLOSE_WAIT", + "LAST_ACK", "LISTEN", "CLOSING", "UNKNOWN"}; + struct passwd *pw; + FILE *fp = fopen(fname, "r"); + + if (!fp) { + perror_msg("'%s'", fname); + return; + } + + if(!fgets(toybuf, sizeof(toybuf), fp)) return; //skip header. + + while (fgets(toybuf, sizeof(toybuf), fp)) { + char lip[256], rip[256]; + union { + struct {unsigned u; unsigned char b[4];} i4; + struct {struct {unsigned a, b, c, d;} u; unsigned char b[16];} i6; + } laddr, raddr; + unsigned lport, rport, state, txq, rxq, num, uid, nitems; + unsigned long inode; + + // Try ipv6, then try ipv4 + nitems = sscanf(toybuf, + " %d: %8x%8x%8x%8x:%x %8x%8x%8x%8x:%x %x %x:%x %*X:%*X %*X %d %*d %ld", + &num, &laddr.i6.u.a, &laddr.i6.u.b, &laddr.i6.u.c, + &laddr.i6.u.d, &lport, &raddr.i6.u.a, &raddr.i6.u.b, + &raddr.i6.u.c, &raddr.i6.u.d, &rport, &state, &txq, &rxq, + &uid, &inode); + + if (nitems!=16) { + nitems = sscanf(toybuf, + " %d: %x:%x %x:%x %x %x:%x %*X:%*X %*X %d %*d %ld", + &num, &laddr.i4.u, &lport, &raddr.i4.u, &rport, &state, &txq, + &rxq, &uid, &inode); + + if (nitems!=10) continue; + nitems = AF_INET; + } else nitems = AF_INET6; + + // Should we display this? (listening or all or TCP/UDP/RAW) + if (!((toys.optflags & FLAG_l) && (!rport && (state & 0xA))) + && !(toys.optflags & FLAG_a) && !(rport & (0x10 | 0x20 | 0x40))) + continue; + + addr2str(nitems, &laddr, lport, lip, TT.wpad, label); + addr2str(nitems, &raddr, rport, rip, TT.wpad, label); + + // Display data + s = label; + if (strstart(&s, "tcp")) { + int sz = ARRAY_LEN(state_label); + if (!state || state >= sz) state = sz-1; + ss_state = state_label[state]; + } else if (strstart(&s, "udp")) { + if (state == 1) ss_state = state_label[state]; + else if (state == 7) ss_state = ""; + } else if (strstart(&s, "raw")) sprintf(ss_state = buf, "%u", state); + + if (!(toys.optflags & FLAG_n) && (pw = bufgetpwuid(uid))) + snprintf(toybuf, sizeof(toybuf), "%s", pw->pw_name); + else snprintf(toybuf, sizeof(toybuf), "%d", uid); + + printf("%-6s%6d%7d ", label, rxq, txq); + printf("%*.*s %*.*s ", -TT.wpad, TT.wpad, lip, -TT.wpad, TT.wpad, rip); + printf("%-11s", ss_state); + if ((toys.optflags & FLAG_e)) printf(" %-10s %-11ld", toybuf, inode); + if ((toys.optflags & FLAG_p)) { + struct num_cache *nc = get_num_cache(TT.inodes, inode); + + printf(" %s", nc ? nc->data : "-"); + } + xputc('\n'); + } + fclose(fp); +} + +static void show_unix_sockets(void) +{ + char *types[] = {"","STREAM","DGRAM","RAW","RDM","SEQPACKET","DCCP","PACKET"}, + *states[] = {"","LISTENING","CONNECTING","CONNECTED","DISCONNECTING"}, + *s, *ss; + unsigned long refcount, flags, type, state, inode; + FILE *fp = xfopen("/proc/net/unix", "r"); + + if(!fgets(toybuf, sizeof(toybuf), fp)) return; //skip header. + + while (fgets(toybuf, sizeof(toybuf), fp)) { + unsigned offset = 0; + + // count = 6 or 7 (first field ignored, sockets don't always have filenames) + if (6<sscanf(toybuf, "%*p: %lX %*X %lX %lX %lX %lu %n", + &refcount, &flags, &type, &state, &inode, &offset)) + continue; + + // Linux exports only SO_ACCEPTCON since 2.3.15pre3 in 1999, but let's + // filter in case they add more someday. + flags &= 1<<16; + + // Only show unconnected listening sockets with -a + if (state==1 && flags && !(toys.optflags&FLAG_a)) continue; + + if (type==10) type = 7; // move SOCK_PACKET into line + if (type>ARRAY_LEN(types)) type = 0; + if (state>ARRAY_LEN(states) || (state==1 && !flags)) state = 0; + sprintf(toybuf, "[ %s]", flags ? "ACC " : ""); + + printf("unix %-6ld %-11s %-10s %-13s %8lu ", + refcount, toybuf, types[type], states[state], inode); + if (toys.optflags & FLAG_p) { + struct num_cache *nc = get_num_cache(TT.inodes, inode); + + printf("%-19.19s", nc ? nc->data : "-"); + } + + if (offset) { + if ((ss = strrchr(s = toybuf+offset, '\n'))) *ss = 0; + printf("%s", s); + } + xputc('\n'); + } + + fclose(fp); +} + +static int scan_pids(struct dirtree *node) +{ + char *s = toybuf+256; + struct dirent *entry; + DIR *dp; + int pid, dirfd; + + if (!node->parent) return DIRTREE_RECURSE; + if (!(pid = atol(node->name))) return 0; + + sprintf(toybuf, "/proc/%d/cmdline", pid); + if (!(readfile(toybuf, toybuf, 256))) return 0; + + sprintf(s, "%d/fd", pid); + if (-1==(dirfd = openat(dirtree_parentfd(node), s, O_RDONLY))) return 0; + if (!(dp = fdopendir(dirfd))) { + close(dirfd); + + return 0; + } + + while ((entry = readdir(dp))) { + s = toybuf+256; + if (!readlinkat0(dirfd, entry->d_name, s, sizeof(toybuf)-256)) continue; + // Can the "[0000]:" happen in a modern kernel? + if (strstart(&s, "socket:[") || strstart(&s, "[0000]:")) { + long long ll = atoll(s); + + sprintf(s, "%d/%s", pid, getbasename(toybuf)); + add_num_cache(&TT.inodes, ll, s, strlen(s)+1); + } + } + closedir(dp); + + return 0; +} + +/* + * extract inet4 route info from /proc/net/route file and display it. + */ +static void display_routes(void) +{ + static const char flagchars[] = "GHRDMDAC"; + static const unsigned flagarray[] = { + RTF_GATEWAY, RTF_HOST, RTF_REINSTATE, RTF_DYNAMIC, RTF_MODIFIED + }; + unsigned long dest, gate, mask; + int flags, ref, use, metric, mss, win, irtt; + char *out = toybuf, *flag_val; + char iface[64]={0}; + FILE *fp = xfopen("/proc/net/route", "r"); + + if(!fgets(toybuf, sizeof(toybuf), fp)) return; //skip header. + + printf("Kernel IP routing table\n" + "Destination\tGateway \tGenmask \tFlags %s Iface\n", + !(toys.optflags&FLAG_e) ? " MSS Window irtt" : "Metric Ref Use"); + + while (fgets(toybuf, sizeof(toybuf), fp)) { + char *destip = 0, *gateip = 0, *maskip = 0; + + if (11 != sscanf(toybuf, "%63s%lx%lx%X%d%d%d%lx%d%d%d", iface, &dest, + &gate, &flags, &ref, &use, &metric, &mask, &mss, &win, &irtt)) + break; + + // skip down interfaces. + if (!(flags & RTF_UP)) continue; + +// TODO /proc/net/ipv6_route + + if (dest) { + if (inet_ntop(AF_INET, &dest, out, 16)) destip = out; + } else destip = (toys.optflags&FLAG_n) ? "0.0.0.0" : "default"; + out += 16; + + if (gate) { + if (inet_ntop(AF_INET, &gate, out, 16)) gateip = out; + } else gateip = (toys.optflags&FLAG_n) ? "0.0.0.0" : "*"; + out += 16; + +// TODO /24 + //For Mask + if (inet_ntop(AF_INET, &mask, out, 16)) maskip = out; + else maskip = "?"; + out += 16; + + //Get flag Values + flag_val = out; + *out++ = 'U'; + for (dest = 0; dest < ARRAY_LEN(flagarray); dest++) + if (flags&flagarray[dest]) *out++ = flagchars[dest]; + *out = 0; + if (flags & RTF_REJECT) *flag_val = '!'; + + printf("%-15.15s %-15.15s %-16s%-6s", destip, gateip, maskip, flag_val); + if (!(toys.optflags & FLAG_e)) + printf("%5d %-5d %6d %s\n", mss, win, irtt, iface); + else printf("%-6d %-2d %7d %s\n", metric, ref, use, iface); + } + + fclose(fp); +} + +void netstat_main(void) +{ + int tuwx = FLAG_t|FLAG_u|FLAG_w|FLAG_x; + char *type = "w/o"; + + TT.wpad = (toys.optflags&FLAG_W) ? 51 : 23; + if (!(toys.optflags&(FLAG_r|tuwx))) toys.optflags |= tuwx; + if (toys.optflags & FLAG_r) display_routes(); + if (!(toys.optflags&tuwx)) return; + + if (toys.optflags & FLAG_a) type = "established and"; + else if (toys.optflags & FLAG_l) type = "only"; + + if (toys.optflags & FLAG_p) dirtree_read("/proc", scan_pids); + + if (toys.optflags&(FLAG_t|FLAG_u|FLAG_w)) { + printf("Active %s (%s servers)\n", "Internet connections", type); + printf("Proto Recv-Q Send-Q %*s %*s State ", -TT.wpad, "Local Address", + -TT.wpad, "Foreign Address"); + if (toys.optflags & FLAG_e) printf(" User Inode "); + if (toys.optflags & FLAG_p) printf(" PID/Program Name"); + xputc('\n'); + + if (toys.optflags & FLAG_t) { + show_ip("/proc/net/tcp"); + show_ip("/proc/net/tcp6"); + } + if (toys.optflags & FLAG_u) { + show_ip("/proc/net/udp"); + show_ip("/proc/net/udp6"); + } + if (toys.optflags & FLAG_w) { + show_ip("/proc/net/raw"); + show_ip("/proc/net/raw6"); + } + } + + if (toys.optflags & FLAG_x) { + printf("Active %s (%s servers)\n", "UNIX domain sockets", type); + + printf("Proto RefCnt Flags\t Type\t State\t %s Path\n", + (toys.optflags&FLAG_p) ? "PID/Program Name" : "I-Node"); + show_unix_sockets(); + } + + if ((toys.optflags & FLAG_p) && CFG_TOYBOX_FREE) + llist_traverse(TT.inodes, free); + toys.exitval = 0; +} |