-
-#if ENABLE_UDPSVD
-/* Based on ipsvd ipsvd-0.12.1. This udpsvd 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.
- *
- * Output of verbose mode matches original (modulo bugs and
- * unimplemented stuff). Unnatural splitting of IP and PORT
- * is retained (personally I prefer one-value "IP:PORT" notation -
- * it is a natural string representation of struct sockaddr_XX).
- */
-
-#include "udp_io.c"
-
-int udpsvd_main(int argc, char **argv);
-int udpsvd_main(int argc, char **argv)
-{
- const char *instructs;
- char *str_t, *user;
- unsigned opt;
-
- char *remote_hostname = (char*)""; /* used if no -h */
- char *local_hostname = NULL;
- char *remote_ip;
- char *local_ip;// = local_ip; /* gcc */
- uint16_t local_port, remote_port;
- len_and_sockaddr remote;
- len_and_sockaddr *localp;
- int wstat;
- unsigned pid;
- struct bb_uidgid_t ugid;
-
- enum {
- OPT_v = (1 << 0),
- OPT_u = (1 << 1),
- OPT_l = (1 << 2),
- OPT_h = (1 << 3),
- OPT_p = (1 << 4),
- OPT_i = (1 << 5),
- OPT_x = (1 << 6),
- OPT_t = (1 << 7),
- };
-
- opt_complementary = "-3:ph:vv";
- opt = getopt32(argc, argv, "vu:l:hpi:x:t:",
- &user, &local_hostname, &instructs, &instructs, &str_t, &verbose);
- if (opt & OPT_u) {
- if (!get_uidgid(&ugid, user, 1))
- bb_error_msg_and_die("unknown user/group: %s", user);
- }
- argv += optind;
- if (!argv[0][0] || LONE_CHAR(argv[0], '0'))
- argv[0] = (char*)"0.0.0.0";
-
- /* stdout is used for logging, don't buffer */
- setlinebuf(stdout);
- bb_sanitize_stdio(); /* fd# 1,2 must be opened */
-
- signal(SIGTERM, sig_term_handler);
- signal(SIGPIPE, SIG_IGN);
-
- local_port = bb_lookup_port(argv[1], "udp", 0);
- localp = xhost2sockaddr(argv[0], local_port);
- /* fd #0 is the open UDP socket */
- xmove_fd(xsocket(localp->sa.sa_family, SOCK_DGRAM, 0), 0);
- setsockopt_reuseaddr(0); /* crucial */
- xbind(0, &localp->sa, localp->len);
- socket_want_pktinfo(0); /* needed for recv_from_to to work */
-
- if (opt & OPT_u) { /* drop permissions */
- xsetgid(ugid.gid);
- xsetuid(ugid.uid);
- }
-
- if (verbose) {
- /* we do it only for ":port" cosmetics... oh well */
- char *addr = xmalloc_sockaddr2dotted(&localp->sa, localp->len);
-
- printf("%s: info: listening on %s", applet_name, addr);
- free(addr);
- if (option_mask32 & OPT_u)
- printf(", uid %u, gid %u",
- (unsigned)ugid.uid, (unsigned)ugid.gid);
- puts(", starting");
- }
-
- again:
- /* if (recvfrom(0, NULL, 0, MSG_PEEK, &remote.sa, &localp->len) < 0) { */
- if (recv_from_to(0, NULL, 0, MSG_PEEK, &remote.sa, &localp->sa, localp->len) < 0) {
- bb_perror_msg("recvfrom");
- goto again;
- }
-
- while ((pid = fork()) < 0) {
- bb_perror_msg("fork failed, sleeping");
- sleep(5);
- }
- if (pid > 0) { /* parent */
- while (wait_pid(&wstat, pid) < 0)
- bb_perror_msg("error waiting for child");
- if (verbose)
- print_waitstat(pid, wstat);
- goto again;
- }
-
- /* Child */
-
- if (verbose) {
- remote_ip = xmalloc_sockaddr2dotted_noport(&remote.sa, localp->len);
- local_ip = xmalloc_sockaddr2dotted_noport(&localp->sa, localp->len);
-
- pid = getpid();
- printf("%s: info: pid %u from %s\n", applet_name, pid, remote_ip);
-
- if (!local_hostname) {
- local_hostname = xmalloc_sockaddr2host_noport(&localp->sa, localp->len);
- if (!local_hostname)
- bb_error_msg_and_die("cannot look up local hostname for %s", local_ip);
- }
- if (opt & OPT_h) {
- remote_hostname = xmalloc_sockaddr2host(&remote.sa, localp->len);
- if (!remote_hostname) {
- bb_error_msg("warning: cannot look up hostname for %s", remote_ip);
- remote_hostname = (char*)"";
- }
- }
-
- remote_port = get_nport(&remote.sa);
- remote_port = ntohs(remote_port);
- printf("%s: info: %u %s:%s :%s:%s:%u\n",
- applet_name, pid, local_hostname, local_ip,
- remote_hostname, remote_ip, remote_port);
- }
-
- /* 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
- * do not expect data coming *from fd #1*! */
-#if 0
- /* Make it so that local addr is fixed to localp->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->sa.sa_family, SOCK_DGRAM, 0), 0);
- setsockopt_reuseaddr(0); /* crucial */
- xbind(0, &localp->sa, localp->len);
-#endif
-
- /* Make plain write to fd #1 work for the child by supplying default
- * destination address. This also restricts incoming packets
- * to ones coming from this remote IP. */
- xconnect(0, &remote.sa, localp->len);
- dup2(0 ,1);
-
- signal(SIGTERM, SIG_DFL);
- signal(SIGPIPE, SIG_DFL);
-
- argv += 2;
- BB_EXECVP(argv[0], argv);
- bb_perror_msg_and_die("exec '%s'", argv[0]);
-}
-
-
-/*
-udpsvd [-hpvv] [-u user] [-l name] [-i dir|-x cdb] [-t sec] host port prog
-
-udpsvd creates an UDP/IP socket, binds it to the address host:port,
-and listens on the socket for incoming datagrams.
-
-If a datagram is available on the socket, udpsvd conditionally starts
-a program, with standard input reading from the socket, and standard
-output redirected to standard error, to handle this, and possibly
-more datagrams. udpsvd does not start the program if another program
-that it has started before still is running. If the program exits,
-udpsvd again listens to the socket until a new datagram is available.
-If there are still datagrams available on the socket, the program
-is restarted immediately.
-
-udpsvd optionally checks for special intructions depending on
-the IP address or hostname of the client sending the datagram which
-not yet was handled by a running program, see ipsvd-instruct(5)
-for details.
-
-Attention:
-UDP is a connectionless protocol. Most programs that handle user datagrams,
-such as talkd(8), keep running after receiving a datagram, and process
-subsequent datagrams sent to the socket until a timeout is reached.
-udpsvd only checks special instructions for a datagram that causes a startup
-of the program; not if a program handling datagrams already is running.
-It doesn't make much sense to restrict access through special instructions
-when using such a program.
-
-On the other hand, it makes perfectly sense with programs like tftpd(8),
-that fork to establish a separate connection to the client when receiving
-the datagram. In general it's adequate to set up special instructions for
-programs that support being run by tcpwrapper.
-Options
-
-host
- host either is a hostname, or a dotted-decimal IP address, or 0.
- If host is 0, udpsvd accepts datagrams to any local IP address.
-port
- udpsvd accepts datagrams to host:port. port may be a name from
- /etc/services or a number.
-prog
- prog consists of one or more arguments. udpsvd normally runs prog
- to handle a datagram, and possibly more, that is sent to the socket,
- if there is no program that was started before by udpsvd still running
- and handling datagrams.
--i dir
- read instructions for handling new connections from the instructions
- directory dir. See ipsvd-instruct(5) for details.
--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).
--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; udpsvd 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.
--l name
- local hostname. Do not look up the local hostname in DNS, but use name
- as hostname. By default udpsvd looks up the local hostname once at startup.
--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.
--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 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.
--v
- verbose. Print verbose messages to standard output.
--vv
- more verbose. Print more verbose messages to standard output.
-*/
-#endif
-
-
-#if ENABLE_TCPSVD
-/* 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.
- *
- * Output of verbose mode matches original (modulo bugs and
- * unimplemented stuff). Unnatural splitting of IP and PORT
- * is retained (personally I prefer one-value "IP:PORT" notation -
- * it is a natural string representation of struct sockaddr_XX).
- *
- * TCPORIGDST{IP,PORT} is busybox-specific addition
- */
-
-#include <limits.h>
-#include <linux/netfilter_ipv4.h> /* wants <limits.h> */
-#include "ipsvd_perhost.h"
-
-#ifdef SSLSVD
-#include "matrixSsl.h"
-#include "ssl_io.h"
-#endif
-
-static unsigned max_per_host; /* originally in ipsvd_check.c */
-static unsigned cur_per_host;
-static unsigned cnum;
-static unsigned cmax = 30;
-