svn add/svn rm to actually move tcp/udpsvd...

5 files changed, 0 insertions, 731 deletions

diff --git a/ipsvd/Config.in b/ipsvd/Config.in
deleted file mode 100644
index 0cb8c62de..000000000
--- a/ipsvd/Config.in
+++ /dev/null
@@ -1,20 +0,0 @@
-#
-# For a description of the syntax of this configuration file,
-# see scripts/kbuild/config-language.txt.
-#
-
-menu "ipsvd Utilities"
-
-config TCPSVD
-        bool "tcpsvd"
-        default n
-        help
-          tcpsvd listens on a tcp port and runs a program for each new connection
-
-config UDPSVD
-        bool "udpsvd"
-        default n
-        help
-          udpsvd listens on a udp port and runs a program for each new connection
-
-endmenu
diff --git a/ipsvd/Kbuild b/ipsvd/Kbuild
deleted file mode 100644
index fc34fea49..000000000
--- a/ipsvd/Kbuild
+++ /dev/null
@@ -1,9 +0,0 @@
-# Makefile for busybox
-#
-# Copyright (C) 1999-2005 by Erik Andersen <andersen@codepoet.org>
-#
-# Licensed under the GPL v2, see the file LICENSE in this tarball.
-
-lib-y:=
-lib-$(CONFIG_TCPSVD) += tcpudp.o ipsvd_perhost.o
-lib-$(CONFIG_UDPSVD) += tcpudp.o ipsvd_perhost.o
diff --git a/ipsvd/ipsvd_perhost.c b/ipsvd/ipsvd_perhost.c
deleted file mode 100644
index 6075c0a3a..000000000
--- a/ipsvd/ipsvd_perhost.c
+++ /dev/null
@@ -1,65 +0,0 @@
-/* Based on ipsvd utilities written by Gerrit Pape <pape@smarden.org>
- * which are released into public domain by the author.
- * Homepage: http://smarden.sunsite.dk/ipsvd/
- *
- * Copyright (C) 2007 Denys Vlasenko.
- *
- * Licensed under GPLv2, see file LICENSE in this tarball for details.
- */
-
-#include "libbb.h"
-#include "ipsvd_perhost.h"
-
-static struct hcc *cc;
-static unsigned cclen;
-
-/* to be optimized */
-
-void ipsvd_perhost_init(unsigned c)
-{
-//      free(cc);
-        cc = xzalloc(c * sizeof(*cc));
-        cclen = c;
-}
-
-unsigned ipsvd_perhost_add(char *ip, unsigned maxconn, struct hcc **hccpp)
-{
-        unsigned i;
-        unsigned conn = 1;
-        int freepos = -1;
-
-        for (i = 0; i < cclen; ++i) {
-                if (!cc[i].ip) {
-                        freepos = i;
-                        continue;
-                }
-                if (strcmp(cc[i].ip, ip) == 0) {
-                        conn++;
-                        continue;
-                }
-        }
-        if (freepos == -1) return 0;
-        if (conn <= maxconn) {
-                cc[freepos].ip = ip;
-                *hccpp = &cc[freepos];
-        }
-        return conn;
-}
-
-void ipsvd_perhost_remove(int pid)
-{
-        unsigned i;
-        for (i = 0; i < cclen; ++i) {
-                if (cc[i].pid == pid) {
-                        free(cc[i].ip);
-                        cc[i].ip = NULL;
-                        cc[i].pid = 0;
-                        return;
-                }
-        }
-}
-
-//void ipsvd_perhost_free(void)
-//{
-//      free(cc);
-//}
diff --git a/ipsvd/ipsvd_perhost.h b/ipsvd/ipsvd_perhost.h
deleted file mode 100644
index 9fc8cee61..000000000
--- a/ipsvd/ipsvd_perhost.h
+++ /dev/null
@@ -1,29 +0,0 @@
-/* Based on ipsvd utilities written by Gerrit Pape <pape@smarden.org>
- * which are released into public domain by the author.
- * Homepage: http://smarden.sunsite.dk/ipsvd/
- *
- * Copyright (C) 2007 Denys Vlasenko.
- *
- * Licensed under GPLv2, see file LICENSE in this tarball for details.
- */
-
-struct hcc {
-        char *ip;
-        int pid;
-};
-
-void ipsvd_perhost_init(unsigned);
-
-/* Returns number of already opened connects to this ips, including this one.
- * ip should be a malloc'ed ptr.
- * If return value is <= maxconn, ip is inserted into the table
- * and pointer to table entry if stored in *hccpp
- * (useful for storing pid later).
- * Else ip is NOT inserted (you must take care of it - free() etc) */
-unsigned ipsvd_perhost_add(char *ip, unsigned maxconn, struct hcc **hccpp);
-
-/* Finds and frees element with pid */
-void ipsvd_perhost_remove(int pid);
-
-//unsigned ipsvd_perhost_setpid(int pid);
-//void ipsvd_perhost_free(void);
diff --git a/ipsvd/tcpudp.c b/ipsvd/tcpudp.c
deleted file mode 100644
index 729b7bca9..000000000
--- a/ipsvd/tcpudp.c
+++ /dev/null
@@ -1,608 +0,0 @@
-/* Based on ipsvd utilities written by Gerrit Pape <pape@smarden.org>
- * which are released into public domain by the author.
- * Homepage: http://smarden.sunsite.dk/ipsvd/
- *
- * Copyright (C) 2007 Denys Vlasenko.
- *
- * Licensed under GPLv2, see file LICENSE in this tarball for details.
- */
-
-/* Based on ipsvd ipsvd-0.12.1. This tcpsvd accepts all options
- * which are supported by one from ipsvd-0.12.1, but not all are
- * functional. See help text at the end of this file for details.
- *
- * Code inside "#ifdef SSLSVD" is for sslsvd and is currently unused.
- *
- * Busybox version exports TCPLOCALADDR instead of
- * TCPLOCALIP + TCPLOCALPORT pair. ADDR more closely matches reality
- * (which is "struct sockaddr_XXX". Port is not a separate entity,
- * it's just a part of (AF_INET[6]) sockaddr!).
- *
- * TCPORIGDSTADDR is Busybox-specific addition.
- *
- * udp server is hacked up by reusing TCP code. It has the following
- * limitation inherent in Unix DGRAM sockets implementation:
- * - local IP address is retrieved (using recvmsg voodoo) but
- *   child's socket is not bound to it (bind cannot be called on
- *   already bound socket). Thus it still can emit outgoing packets
- *   with wrong source IP...
- * - don't know how to retrieve ORIGDST for udp.
- */
-
-#include <limits.h>
-#include <linux/netfilter_ipv4.h> /* wants <limits.h> */
-
-#include "libbb.h"
-#include "ipsvd_perhost.h"
-
-#ifdef SSLSVD
-#include "matrixSsl.h"
-#include "ssl_io.h"
-#endif
-
-struct globals {
-        unsigned verbose;
-        unsigned max_per_host;
-        unsigned cur_per_host;
-        unsigned cnum;
-        unsigned cmax;
-        char **env_cur;
-        char *env_var[1]; /* actually bigger */
-};
-#define G (*(struct globals*)&bb_common_bufsiz1)
-#define verbose      (G.verbose     )
-#define max_per_host (G.max_per_host)
-#define cur_per_host (G.cur_per_host)
-#define cnum         (G.cnum        )
-#define cmax         (G.cmax        )
-#define env_cur      (G.env_cur     )
-#define env_var      (G.env_var     )
-#define INIT_G() \
-        do { \
-                cmax = 30; \
-                env_cur = &env_var[0]; \
-        } while (0)
-
-
-/* We have to be careful about leaking memory in repeated setenv's */
-static void xsetenv_plain(const char *n, const char *v)
-{
-        char *var = xasprintf("%s=%s", n, v);
-        *env_cur++ = var;
-        putenv(var);
-}
-
-static void xsetenv_proto(const char *proto, const char *n, const char *v)
-{
-        char *var = xasprintf("%s%s=%s", proto, n, v);
-        *env_cur++ = var;
-        putenv(var);
-}
-
-static void undo_xsetenv(void)
-{
-        char **pp = env_cur = &env_var[0];
-        while (*pp) {
-                char *var = *pp;
-                *strchrnul(var, '=') = '\0';
-                unsetenv(var);
-                free(var);
-                *pp++ = NULL;
-        }
-}
-
-static void sig_term_handler(int sig)
-{
-        if (verbose)
-                bb_error_msg("got signal %u, exit", sig);
-        kill_myself_with_sig(sig);
-}
-
-/* Little bloated, but tries to give accurate info how child exited.
- * Makes easier to spot segfaulting children etc... */
-static void print_waitstat(unsigned pid, int wstat)
-{
-        unsigned e = 0;
-        const char *cause = "?exit";
-
-        if (WIFEXITED(wstat)) {
-                cause++;
-                e = WEXITSTATUS(wstat);
-        } else if (WIFSIGNALED(wstat)) {
-                cause = "signal";
-                e = WTERMSIG(wstat);
-        }
-        bb_error_msg("end %d %s %d", pid, cause, e);
-}
-
-/* Must match getopt32 in main! */
-enum {
-        OPT_c = (1 << 0),
-        OPT_C = (1 << 1),
-        OPT_i = (1 << 2),
-        OPT_x = (1 << 3),
-        OPT_u = (1 << 4),
-        OPT_l = (1 << 5),
-        OPT_E = (1 << 6),
-        OPT_b = (1 << 7),
-        OPT_h = (1 << 8),
-        OPT_p = (1 << 9),
-        OPT_t = (1 << 10),
-        OPT_v = (1 << 11),
-        OPT_V = (1 << 12),
-        OPT_U = (1 << 13), /* from here: sslsvd only */
-        OPT_slash = (1 << 14),
-        OPT_Z = (1 << 15),
-        OPT_K = (1 << 16),
-};
-
-static void connection_status(void)
-{
-        /* "only 1 client max" desn't need this */
-        if (cmax > 1)
-                bb_error_msg("status %u/%u", cnum, cmax);
-}
-
-static void sig_child_handler(int sig ATTRIBUTE_UNUSED)
-{
-        int wstat;
-        int pid;
-
-        while ((pid = wait_any_nohang(&wstat)) > 0) {
-                if (max_per_host)
-                        ipsvd_perhost_remove(pid);
-                if (cnum)
-                        cnum--;
-                if (verbose)
-                        print_waitstat(pid, wstat);
-        }
-        if (verbose)
-                connection_status();
-}
-
-int tcpudpsvd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int tcpudpsvd_main(int argc ATTRIBUTE_UNUSED, char **argv)
-{
-        char *str_C, *str_t;
-        char *user;
-        struct hcc *hccp;
-        const char *instructs;
-        char *msg_per_host = NULL;
-        unsigned len_per_host = len_per_host; /* gcc */
-#ifndef SSLSVD
-        struct bb_uidgid_t ugid;
-#endif
-        bool tcp;
-        uint16_t local_port;
-        char *preset_local_hostname = NULL;
-        char *remote_hostname = remote_hostname; /* for compiler */
-        char *remote_addr = remote_addr; /* for compiler */
-        len_and_sockaddr *lsa;
-        len_and_sockaddr local, remote;
-        socklen_t sa_len;
-        int pid;
-        int sock;
-        int conn;
-        unsigned backlog = 20;
-
-        INIT_G();
-
-        tcp = (applet_name[0] == 't');
-
-        /* 3+ args, -i at most once, -p implies -h, -v is counter, -b N, -c N */
-        opt_complementary = "-3:i--i:ph:vv:b+:c+";
-#ifdef SSLSVD
-        getopt32(argv, "+c:C:i:x:u:l:Eb:hpt:vU:/:Z:K:",
-                &cmax, &str_C, &instructs, &instructs, &user, &preset_local_hostname,
-                &backlog, &str_t, &ssluser, &root, &cert, &key, &verbose
-        );
-#else
-        /* "+": stop on first non-option */
-        getopt32(argv, "+c:C:i:x:u:l:Eb:hpt:v",
-                &cmax, &str_C, &instructs, &instructs, &user, &preset_local_hostname,
-                &backlog, &str_t, &verbose
-        );
-#endif
-        if (option_mask32 & OPT_C) { /* -C n[:message] */
-                max_per_host = bb_strtou(str_C, &str_C, 10);
-                if (str_C[0]) {
-                        if (str_C[0] != ':')
-                                bb_show_usage();
-                        msg_per_host = str_C + 1;
-                        len_per_host = strlen(msg_per_host);
-                }
-        }
-        if (max_per_host > cmax)
-                max_per_host = cmax;
-        if (option_mask32 & OPT_u) {
-                if (!get_uidgid(&ugid, user, 1))
-                        bb_error_msg_and_die("unknown user/group: %s", user);
-        }
-#ifdef SSLSVD
-        if (option_mask32 & OPT_U) ssluser = optarg;
-        if (option_mask32 & OPT_slash) root = optarg;
-        if (option_mask32 & OPT_Z) cert = optarg;
-        if (option_mask32 & OPT_K) key = optarg;
-#endif
-        argv += optind;
-        if (!argv[0][0] || LONE_CHAR(argv[0], '0'))
-                argv[0] = (char*)"0.0.0.0";
-
-        /* Per-IP flood protection is not thought-out for UDP */
-        if (!tcp)
-                max_per_host = 0;
-
-        bb_sanitize_stdio(); /* fd# 0,1,2 must be opened */
-
-#ifdef SSLSVD
-        sslser = user;
-        client = 0;
-        if ((getuid() == 0) && !(option_mask32 & OPT_u)) {
-                xfunc_exitcode = 100;
-                bb_error_msg_and_die("-U ssluser must be set when running as root");
-        }
-        if (option_mask32 & OPT_u)
-                if (!uidgid_get(&sslugid, ssluser, 1)) {
-                        if (errno) {
-                                bb_perror_msg_and_die("fatal: cannot get user/group: %s", ssluser);
-                        }
-                        bb_error_msg_and_die("unknown user/group '%s'", ssluser);
-                }
-        if (!cert) cert = "./cert.pem";
-        if (!key) key = cert;
-        if (matrixSslOpen() < 0)
-                fatal("cannot initialize ssl");
-        if (matrixSslReadKeys(&keys, cert, key, 0, ca) < 0) {
-                if (client)
-                        fatal("cannot read cert, key, or ca file");
-                fatal("cannot read cert or key file");
-        }
-        if (matrixSslNewSession(&ssl, keys, 0, SSL_FLAGS_SERVER) < 0)
-                fatal("cannot create ssl session");
-#endif
-
-        sig_block(SIGCHLD);
-        signal(SIGCHLD, sig_child_handler);
-        bb_signals(BB_SIGS_FATAL, sig_term_handler);
-        signal(SIGPIPE, SIG_IGN);
-
-        if (max_per_host)
-                ipsvd_perhost_init(cmax);
-
-        local_port = bb_lookup_port(argv[1], tcp ? "tcp" : "udp", 0);
-        lsa = xhost2sockaddr(argv[0], local_port);
-        argv += 2;
-
-        sock = xsocket(lsa->u.sa.sa_family, tcp ? SOCK_STREAM : SOCK_DGRAM, 0);
-        setsockopt_reuseaddr(sock);
-        sa_len = lsa->len; /* I presume sockaddr len stays the same */
-        xbind(sock, &lsa->u.sa, sa_len);
-        if (tcp)
-                xlisten(sock, backlog);
-        else /* udp: needed for recv_from_to to work: */
-                socket_want_pktinfo(sock);
-        /* ndelay_off(sock); - it is the default I think? */
-
-#ifndef SSLSVD
-        if (option_mask32 & OPT_u) {
-                /* drop permissions */
-                xsetgid(ugid.gid);
-                xsetuid(ugid.uid);
-        }
-#endif
-
-        if (verbose) {
-                char *addr = xmalloc_sockaddr2dotted(&lsa->u.sa);
-                bb_error_msg("listening on %s, starting", addr);
-                free(addr);
-#ifndef SSLSVD
-                if (option_mask32 & OPT_u)
-                        printf(", uid %u, gid %u",
-                                (unsigned)ugid.uid, (unsigned)ugid.gid);
-#endif
-        }
-
-        /* Main accept() loop */
-
- again:
-        hccp = NULL;
-
-        while (cnum >= cmax)
-                wait_for_any_sig(); /* expecting SIGCHLD */
-
-        /* Accept a connection to fd #0 */
- again1:
-        close(0);
- again2:
-        sig_unblock(SIGCHLD);
-        local.len = remote.len = sa_len;
-        if (tcp) {
-                conn = accept(sock, &remote.u.sa, &remote.len);
-        } else {
-                /* In case recv_from_to won't be able to recover local addr.
-                 * Also sets port - recv_from_to is unable to do it. */
-                local = *lsa;
-                conn = recv_from_to(sock, NULL, 0, MSG_PEEK,
-                                &remote.u.sa, &local.u.sa, sa_len);
-        }
-        sig_block(SIGCHLD);
-        if (conn < 0) {
-                if (errno != EINTR)
-                        bb_perror_msg(tcp ? "accept" : "recv");
-                goto again2;
-        }
-        xmove_fd(tcp ? conn : sock, 0);
-
-        if (max_per_host) {
-                /* Drop connection immediately if cur_per_host > max_per_host
-                 * (minimizing load under SYN flood) */
-                remote_addr = xmalloc_sockaddr2dotted_noport(&remote.u.sa);
-                cur_per_host = ipsvd_perhost_add(remote_addr, max_per_host, &hccp);
-                if (cur_per_host > max_per_host) {
-                        /* ipsvd_perhost_add detected that max is exceeded
-                         * (and did not store ip in connection table) */
-                        free(remote_addr);
-                        if (msg_per_host) {
-                                /* don't block or test for errors */
-                                send(0, msg_per_host, len_per_host, MSG_DONTWAIT);
-                        }
-                        goto again1;
-                }
-                /* NB: remote_addr is not leaked, it is stored in conn table */
-        }
-
-        if (!tcp) {
-                /* Voodoo magic: making udp sockets each receive its own
-                 * packets is not trivial, and I still not sure
-                 * I do it 100% right.
-                 * 1) we have to do it before fork()
-                 * 2) order is important - is it right now? */
-
-                /* Open new non-connected UDP socket for further clients... */
-                sock = xsocket(lsa->u.sa.sa_family, SOCK_DGRAM, 0);
-                setsockopt_reuseaddr(sock);
-                /* Make plain write/send work for old socket by supplying default
-                 * destination address. This also restricts incoming packets
-                 * to ones coming from this remote IP. */
-                xconnect(0, &remote.u.sa, sa_len);
-        /* hole? at this point we have no wildcard udp socket...
-         * can this cause clients to get "port unreachable" icmp?
-         * Yup, time window is very small, but it exists (is it?) */
-                /* ..."open new socket", continued */
-                xbind(sock, &lsa->u.sa, sa_len);
-                socket_want_pktinfo(sock);
-
-                /* Doesn't work:
-                 * we cannot replace fd #0 - we will lose pending packet
-                 * which is already buffered for us! And we cannot use fd #1
-                 * instead - it will "intercept" all following packets, but child
-                 * does not expect data coming *from fd #1*! */
-#if 0
-                /* Make it so that local addr is fixed to localp->u.sa
-                 * and we don't accidentally accept packets to other local IPs. */
-                /* NB: we possibly bind to the _very_ same_ address & port as the one
-                 * already bound in parent! This seems to work in Linux.
-                 * (otherwise we can move socket to fd #0 only if bind succeeds) */
-                close(0);
-                set_nport(localp, htons(local_port));
-                xmove_fd(xsocket(localp->u.sa.sa_family, SOCK_DGRAM, 0), 0);
-                setsockopt_reuseaddr(0); /* crucial */
-                xbind(0, &localp->u.sa, localp->len);
-#endif
-        }
-
-        pid = vfork();
-        if (pid == -1) {
-                bb_perror_msg("vfork");
-                goto again;
-        }
-
-        if (pid != 0) {
-                /* Parent */
-                cnum++;
-                if (verbose)
-                        connection_status();
-                if (hccp)
-                        hccp->pid = pid;
-                /* clean up changes done by vforked child */
-                undo_xsetenv();
-                goto again;
-        }
-
-        /* Child: prepare env, log, and exec prog */
-
-        /* Closing tcp listening socket */
-        if (tcp)
-                close(sock);
-
-        { /* vfork alert! every xmalloc in this block should be freed! */
-                char *local_hostname = local_hostname; /* for compiler */
-                char *local_addr = NULL;
-                char *free_me0 = NULL;
-                char *free_me1 = NULL;
-                char *free_me2 = NULL;
-
-                if (verbose || !(option_mask32 & OPT_E)) {
-                        if (!max_per_host) /* remote_addr is not yet known */
-                                free_me0 = remote_addr = xmalloc_sockaddr2dotted(&remote.u.sa);
-                        if (option_mask32 & OPT_h) {
-                                free_me1 = remote_hostname = xmalloc_sockaddr2host_noport(&remote.u.sa);
-                                if (!remote_hostname) {
-                                        bb_error_msg("cannot look up hostname for %s", remote_addr);
-                                        remote_hostname = remote_addr;
-                                }
-                        }
-                        /* Find out local IP peer connected to.
-                         * Errors ignored (I'm not paranoid enough to imagine kernel
-                         * which doesn't know local IP). */
-                        if (tcp)
-                                getsockname(0, &local.u.sa, &local.len);
-                        /* else: for UDP it is done earlier by parent */
-                        local_addr = xmalloc_sockaddr2dotted(&local.u.sa);
-                        if (option_mask32 & OPT_h) {
-                                local_hostname = preset_local_hostname;
-                                if (!local_hostname) {
-                                        free_me2 = local_hostname = xmalloc_sockaddr2host_noport(&local.u.sa);
-                                        if (!local_hostname)
-                                                bb_error_msg_and_die("cannot look up hostname for %s", local_addr);
-                                }
-                                /* else: local_hostname is not NULL, but is NOT malloced! */
-                        }
-                }
-                if (verbose) {
-                        pid = getpid();
-                        if (max_per_host) {
-                                bb_error_msg("concurrency %s %u/%u",
-                                        remote_addr,
-                                        cur_per_host, max_per_host);
-                        }
-                        bb_error_msg((option_mask32 & OPT_h)
-                                ? "start %u %s-%s (%s-%s)"
-                                : "start %u %s-%s",
-                                pid,
-                                local_addr, remote_addr,
-                                local_hostname, remote_hostname);
-                }
-
-                if (!(option_mask32 & OPT_E)) {
-                        /* setup ucspi env */
-                        const char *proto = tcp ? "TCP" : "UDP";
-
-                        /* Extract "original" destination addr:port
-                         * from Linux firewall. Useful when you redirect
-                         * an outbond connection to local handler, and it needs
-                         * to know where it originally tried to connect */
-                        if (tcp && getsockopt(0, SOL_IP, SO_ORIGINAL_DST, &local.u.sa, &local.len) == 0) {
-                                char *addr = xmalloc_sockaddr2dotted(&local.u.sa);
-                                xsetenv_plain("TCPORIGDSTADDR", addr);
-                                free(addr);
-                        }
-                        xsetenv_plain("PROTO", proto);
-                        xsetenv_proto(proto, "LOCALADDR", local_addr);
-                        xsetenv_proto(proto, "REMOTEADDR", remote_addr);
-                        if (option_mask32 & OPT_h) {
-                                xsetenv_proto(proto, "LOCALHOST", local_hostname);
-                                xsetenv_proto(proto, "REMOTEHOST", remote_hostname);
-                        }
-                        //compat? xsetenv_proto(proto, "REMOTEINFO", "");
-                        /* additional */
-                        if (cur_per_host > 0) /* can not be true for udp */
-                                xsetenv_plain("TCPCONCURRENCY", utoa(cur_per_host));
-                }
-                free(local_addr);
-                free(free_me0);
-                free(free_me1);
-                free(free_me2);
-        }
-
-        xdup2(0, 1);
-
-        signal(SIGTERM, SIG_DFL);
-        signal(SIGPIPE, SIG_DFL);
-        signal(SIGCHLD, SIG_DFL);
-        sig_unblock(SIGCHLD);
-
-#ifdef SSLSVD
-        strcpy(id, utoa(pid));
-        ssl_io(0, argv);
-#else
-        BB_EXECVP(argv[0], argv);
-#endif
-        bb_perror_msg_and_die("exec '%s'", argv[0]);
-}
-
-/*
-tcpsvd [-hpEvv] [-c n] [-C n:msg] [-b n] [-u user] [-l name]
-        [-i dir|-x cdb] [ -t sec] host port prog
-
-tcpsvd creates a TCP/IP socket, binds it to the address host:port,
-and listens on the socket for incoming connections.
-
-On each incoming connection, tcpsvd conditionally runs a program,
-with standard input reading from the socket, and standard output
-writing to the socket, to handle this connection. tcpsvd keeps
-listening on the socket for new connections, and can handle
-multiple connections simultaneously.
-
-tcpsvd optionally checks for special instructions depending
-on the IP address or hostname of the client that initiated
-the connection, see ipsvd-instruct(5).
-
-host
-    host either is a hostname, or a dotted-decimal IP address,
-    or 0. If host is 0, tcpsvd accepts connections to any local
-    IP address.
-    * busybox accepts IPv6 addresses and host:port pairs too
-      In this case second parameter is ignored
-port
-    tcpsvd accepts connections to host:port. port may be a name
-    from /etc/services or a number.
-prog
-    prog consists of one or more arguments. For each connection,
-    tcpsvd normally runs prog, with file descriptor 0 reading from
-    the network, and file descriptor 1 writing to the network.
-    By default it also sets up TCP-related environment variables,
-    see tcp-environ(5)
--i dir
-    read instructions for handling new connections from the instructions
-    directory dir. See ipsvd-instruct(5) for details.
-    * ignored by busyboxed version
--x cdb
-    read instructions for handling new connections from the constant database
-    cdb. The constant database normally is created from an instructions
-    directory by running ipsvd-cdb(8).
-    * ignored by busyboxed version
--t sec
-    timeout. This option only takes effect if the -i option is given.
-    While checking the instructions directory, check the time of last access
-    of the file that matches the clients address or hostname if any, discard
-    and remove the file if it wasn't accessed within the last sec seconds;
-    tcpsvd does not discard or remove a file if the user's write permission
-    is not set, for those files the timeout is disabled. Default is 0,
-    which means that the timeout is disabled.
-    * ignored by busyboxed version
--l name
-    local hostname. Do not look up the local hostname in DNS, but use name
-    as hostname. This option must be set if tcpsvd listens on port 53
-    to avoid loops.
--u user[:group]
-    drop permissions. Switch user ID to user's UID, and group ID to user's
-    primary GID after creating and binding to the socket. If user is followed
-    by a colon and a group name, the group ID is switched to the GID of group
-    instead. All supplementary groups are removed.
--c n
-    concurrency. Handle up to n connections simultaneously. Default is 30.
-    If there are n connections active, tcpsvd defers acceptance of a new
-    connection until an active connection is closed.
--C n[:msg]
-    per host concurrency. Allow only up to n connections from the same IP
-    address simultaneously. If there are n active connections from one IP
-    address, new incoming connections from this IP address are closed
-    immediately. If n is followed by :msg, the message msg is written
-    to the client if possible, before closing the connection. By default
-    msg is empty. See ipsvd-instruct(5) for supported escape sequences in msg.
-
-    For each accepted connection, the current per host concurrency is
-    available through the environment variable TCPCONCURRENCY. n and msg
-    can be overwritten by ipsvd(7) instructions, see ipsvd-instruct(5).
-    By default tcpsvd doesn't keep track of connections.
--h
-    Look up the client's hostname in DNS.
--p
-    paranoid. After looking up the client's hostname in DNS, look up the IP
-    addresses in DNS for that hostname, and forget about the hostname
-    if none of the addresses match the client's IP address. You should
-    set this option if you use hostname based instructions. The -p option
-    implies the -h option.
-    * ignored by busyboxed version
--b n
-    backlog. Allow a backlog of approximately n TCP SYNs. On some systems n
-    is silently limited. Default is 20.
--E
-    no special environment. Do not set up TCP-related environment variables.
--v
-    verbose. Print verbose messsages to standard output.
--vv
-    more verbose. Print more verbose messages to standard output.
-    * no difference between -v and -vv in busyboxed version
-*/