| /*- |
| * Copyright (c) 1983, 1991, 1993, 1994 |
| * The Regents of the University of California. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * |
| * $FreeBSD: src/usr.sbin/inetd/builtins.c,v 1.19.2.6 2001/07/17 10:45:03 dwmalone Exp $ |
| * |
| */ |
| |
| #include <sys/filio.h> |
| #include <sys/ioccom.h> |
| #include <sys/param.h> |
| #include <sys/stat.h> |
| #include <sys/socket.h> |
| #include <sys/sysctl.h> |
| #include <sys/ucred.h> |
| #include <sys/uio.h> |
| #include <sys/utsname.h> |
| |
| #include <ctype.h> |
| #include <err.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <limits.h> |
| #include <pwd.h> |
| #include <signal.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sysexits.h> |
| #include <syslog.h> |
| #include <unistd.h> |
| |
| #include "inetd.h" |
| |
| void chargen_dg __P((int, struct servtab *)); |
| void chargen_stream __P((int, struct servtab *)); |
| void daytime_dg __P((int, struct servtab *)); |
| void daytime_stream __P((int, struct servtab *)); |
| void discard_dg __P((int, struct servtab *)); |
| void discard_stream __P((int, struct servtab *)); |
| void echo_dg __P((int, struct servtab *)); |
| void echo_stream __P((int, struct servtab *)); |
| static int getline __P((int, char *, int)); |
| void iderror __P((int, int, int, const char *)); |
| void ident_stream __P((int, struct servtab *)); |
| void initring __P((void)); |
| unsigned long machtime __P((void)); |
| void machtime_dg __P((int, struct servtab *)); |
| void machtime_stream __P((int, struct servtab *)); |
| |
| char ring[128]; |
| char *endring; |
| |
| |
| struct biltin biltins[] = { |
| /* Echo received data */ |
| { "echo", SOCK_STREAM, 1, -1, echo_stream }, |
| { "echo", SOCK_DGRAM, 0, 1, echo_dg }, |
| |
| /* Internet /dev/null */ |
| { "discard", SOCK_STREAM, 1, -1, discard_stream }, |
| { "discard", SOCK_DGRAM, 0, 1, discard_dg }, |
| |
| /* Return 32 bit time since 1900 */ |
| { "time", SOCK_STREAM, 0, -1, machtime_stream }, |
| { "time", SOCK_DGRAM, 0, 1, machtime_dg }, |
| |
| /* Return human-readable time */ |
| { "daytime", SOCK_STREAM, 0, -1, daytime_stream }, |
| { "daytime", SOCK_DGRAM, 0, 1, daytime_dg }, |
| |
| /* Familiar character generator */ |
| { "chargen", SOCK_STREAM, 1, -1, chargen_stream }, |
| { "chargen", SOCK_DGRAM, 0, 1, chargen_dg }, |
| |
| { "tcpmux", SOCK_STREAM, 1, -1, (bi_fn_t *)tcpmux }, |
| |
| { "auth", SOCK_STREAM, 1, -1, ident_stream }, |
| |
| { NULL, 0, 0, 0, NULL } |
| }; |
| |
| /* |
| * RFC864 Character Generator Protocol. Generates character data without |
| * any regard for input. |
| */ |
| |
| void |
| initring() |
| { |
| int i; |
| |
| endring = ring; |
| |
| for (i = 0; i <= 128; ++i) |
| if (isprint(i)) |
| *endring++ = i; |
| } |
| |
| /* ARGSUSED */ |
| void |
| chargen_dg(s, sep) /* Character generator */ |
| int s; |
| struct servtab *sep; |
| { |
| struct sockaddr_storage ss; |
| static char *rs; |
| int len; |
| socklen_t size; |
| char text[LINESIZ+2]; |
| |
| if (endring == 0) { |
| initring(); |
| rs = ring; |
| } |
| |
| size = sizeof(ss); |
| if (recvfrom(s, text, sizeof(text), 0, |
| (struct sockaddr *)&ss, &size) < 0) |
| return; |
| |
| if (check_loop((struct sockaddr *)&ss, sep)) |
| return; |
| |
| if ((len = endring - rs) >= LINESIZ) |
| memmove(text, rs, LINESIZ); |
| else { |
| memmove(text, rs, len); |
| memmove(text + len, ring, LINESIZ - len); |
| } |
| if (++rs == endring) |
| rs = ring; |
| text[LINESIZ] = '\r'; |
| text[LINESIZ + 1] = '\n'; |
| (void) sendto(s, text, sizeof(text), 0, (struct sockaddr *)&ss, size); |
| } |
| |
| /* ARGSUSED */ |
| void |
| chargen_stream(s, sep) /* Character generator */ |
| int s; |
| struct servtab *sep; |
| { |
| int len; |
| char *rs, text[LINESIZ+2]; |
| |
| inetd_setproctitle(sep->se_service, s); |
| |
| if (!endring) { |
| initring(); |
| rs = ring; |
| } |
| |
| text[LINESIZ] = '\r'; |
| text[LINESIZ + 1] = '\n'; |
| for (rs = ring;;) { |
| if ((len = endring - rs) >= LINESIZ) |
| memmove(text, rs, LINESIZ); |
| else { |
| memmove(text, rs, len); |
| memmove(text + len, ring, LINESIZ - len); |
| } |
| if (++rs == endring) |
| rs = ring; |
| if (write(s, text, sizeof(text)) != sizeof(text)) |
| break; |
| } |
| exit(0); |
| } |
| |
| /* |
| * RFC867 Daytime Protocol. Sends the current date and time as an ascii |
| * character string without any regard for input. |
| */ |
| |
| /* ARGSUSED */ |
| void |
| daytime_dg(s, sep) /* Return human-readable time of day */ |
| int s; |
| struct servtab *sep; |
| { |
| char buffer[256]; |
| time_t now; |
| struct sockaddr_storage ss; |
| socklen_t size; |
| |
| now = time((time_t *) 0); |
| |
| size = sizeof(ss); |
| if (recvfrom(s, buffer, sizeof(buffer), 0, |
| (struct sockaddr *)&ss, &size) < 0) |
| return; |
| |
| if (check_loop((struct sockaddr *)&ss, sep)) |
| return; |
| |
| (void) sprintf(buffer, "%.24s\r\n", ctime(&now)); |
| (void) sendto(s, buffer, strlen(buffer), 0, |
| (struct sockaddr *)&ss, size); |
| } |
| |
| /* ARGSUSED */ |
| void |
| daytime_stream(s, sep) /* Return human-readable time of day */ |
| int s; |
| struct servtab *sep __unused; |
| { |
| char buffer[256]; |
| time_t now; |
| |
| now = time((time_t *) 0); |
| |
| (void) sprintf(buffer, "%.24s\r\n", ctime(&now)); |
| (void) send(s, buffer, strlen(buffer), MSG_EOF); |
| } |
| |
| /* |
| * RFC863 Discard Protocol. Any data received is thrown away and no response |
| * is sent. |
| */ |
| |
| /* ARGSUSED */ |
| void |
| discard_dg(s, sep) /* Discard service -- ignore data */ |
| int s; |
| struct servtab *sep __unused; |
| { |
| char buffer[BUFSIZE]; |
| |
| (void) read(s, buffer, sizeof(buffer)); |
| } |
| |
| /* ARGSUSED */ |
| void |
| discard_stream(s, sep) /* Discard service -- ignore data */ |
| int s; |
| struct servtab *sep; |
| { |
| int ret; |
| char buffer[BUFSIZE]; |
| |
| inetd_setproctitle(sep->se_service, s); |
| while (1) { |
| while ((ret = read(s, buffer, sizeof(buffer))) > 0) |
| ; |
| if (ret == 0 || errno != EINTR) |
| break; |
| } |
| exit(0); |
| } |
| |
| /* |
| * RFC862 Echo Protocol. Any data received is sent back to the sender as |
| * received. |
| */ |
| |
| /* ARGSUSED */ |
| void |
| echo_dg(s, sep) /* Echo service -- echo data back */ |
| int s; |
| struct servtab *sep; |
| { |
| char buffer[65536]; /* Should be sizeof(max datagram). */ |
| int i; |
| socklen_t size; |
| struct sockaddr_storage ss; |
| |
| size = sizeof(ss); |
| if ((i = recvfrom(s, buffer, sizeof(buffer), 0, |
| (struct sockaddr *)&ss, &size)) < 0) |
| return; |
| |
| if (check_loop((struct sockaddr *)&ss, sep)) |
| return; |
| |
| (void) sendto(s, buffer, i, 0, (struct sockaddr *)&ss, size); |
| } |
| |
| /* ARGSUSED */ |
| void |
| echo_stream(s, sep) /* Echo service -- echo data back */ |
| int s; |
| struct servtab *sep; |
| { |
| char buffer[BUFSIZE]; |
| int i; |
| |
| inetd_setproctitle(sep->se_service, s); |
| while ((i = read(s, buffer, sizeof(buffer))) > 0 && |
| write(s, buffer, i) > 0) |
| ; |
| exit(0); |
| } |
| |
| /* |
| * RFC1413 Identification Protocol. Given a TCP port number pair, return a |
| * character string which identifies the owner of that connection on the |
| * server's system. Extended to allow for ~/.fakeid support and ~/.noident |
| * support. |
| */ |
| |
| /* RFC 1413 says the following are the only errors you can return. */ |
| #define ID_INVALID "INVALID-PORT" /* Port number improperly specified. */ |
| #define ID_NOUSER "NO-USER" /* Port not in use/not identifable. */ |
| #define ID_HIDDEN "HIDDEN-USER" /* Hiden at user's request. */ |
| #define ID_UNKNOWN "UNKNOWN-ERROR" /* Everything else. */ |
| |
| /* ARGSUSED */ |
| void |
| iderror(lport, fport, s, er) /* Generic ident_stream error-sending func */ |
| int lport, fport, s; |
| const char *er; |
| { |
| char *p; |
| |
| asprintf(&p, "%d , %d : ERROR : %s\r\n", lport, fport, er); |
| if (p == NULL) { |
| syslog(LOG_ERR, "asprintf: %m"); |
| exit(EX_OSERR); |
| } |
| send(s, p, strlen(p), MSG_EOF); |
| free(p); |
| |
| exit(0); |
| } |
| |
| /* ARGSUSED */ |
| void |
| ident_stream(s, sep) /* Ident service (AKA "auth") */ |
| int s; |
| struct servtab *sep; |
| { |
| struct utsname un; |
| struct stat sb; |
| struct sockaddr_in sin4[2]; |
| #ifdef INET6 |
| struct sockaddr_in6 sin6[2]; |
| #endif |
| struct sockaddr_storage ss[2]; |
| struct ucred uc; |
| struct timeval tv = { |
| 10, |
| 0 |
| }, to; |
| struct passwd *pw = NULL; |
| fd_set fdset; |
| char buf[BUFSIZE], *p, **av, *osname = NULL, e; |
| char idbuf[MAXLOGNAME] = ""; /* Big enough to hold uid in decimal. */ |
| socklen_t socklen; |
| ssize_t ssize; |
| size_t size, bufsiz; |
| int c, fflag = 0, nflag = 0, rflag = 0, argc = 0; |
| int gflag = 0, iflag = 0, Fflag = 0, getcredfail = 0, onreadlen; |
| u_short lport, fport; |
| |
| inetd_setproctitle(sep->se_service, s); |
| /* |
| * Reset getopt() since we are a fork() but not an exec() from |
| * a parent which used getopt() already. |
| */ |
| optind = 1; |
| optreset = 1; |
| /* |
| * Take the internal argument vector and count it out to make an |
| * argument count for getopt. This can be used for any internal |
| * service to read arguments and use getopt() easily. |
| */ |
| for (av = sep->se_argv; *av; av++) |
| argc++; |
| if (argc) { |
| int sec, usec; |
| size_t i; |
| u_int32_t rnd32; |
| |
| while ((c = getopt(argc, sep->se_argv, "d:fFgino:rt:")) != -1) |
| switch (c) { |
| case 'd': |
| if (!gflag) |
| strlcpy(idbuf, optarg, sizeof(idbuf)); |
| break; |
| case 'f': |
| fflag = 1; |
| break; |
| case 'F': |
| fflag = 1; |
| Fflag=1; |
| break; |
| case 'g': |
| gflag = 1; |
| rnd32 = 0; /* Shush, compiler. */ |
| /* |
| * The number of bits in "rnd32" divided |
| * by the number of bits needed per iteration |
| * gives a more optimal way to reload the |
| * random number only when necessary. |
| * |
| * 32 bits from arc4random corrisponds to |
| * about 6 base-36 digits, so we reseed evey 6. |
| */ |
| for (i = 0; i < sizeof(idbuf) - 1; i++) { |
| static const char *const base36 = |
| "0123456789" |
| "abcdefghijklmnopqrstuvwxyz"; |
| if (i % 6 == 0) |
| rnd32 = arc4random(); |
| idbuf[i] = base36[rnd32 % 36]; |
| rnd32 /= 36; |
| } |
| idbuf[i] = '\0'; |
| break; |
| case 'i': |
| iflag = 1; |
| break; |
| case 'n': |
| nflag = 1; |
| break; |
| case 'o': |
| osname = optarg; |
| break; |
| case 'r': |
| rflag = 1; |
| break; |
| case 't': |
| switch (sscanf(optarg, "%d.%d", &sec, &usec)) { |
| case 2: |
| tv.tv_usec = usec; |
| /* FALLTHROUGH */ |
| case 1: |
| tv.tv_sec = sec; |
| break; |
| default: |
| if (debug) |
| warnx("bad -t argument"); |
| break; |
| } |
| break; |
| default: |
| break; |
| } |
| } |
| if (osname == NULL) { |
| if (uname(&un) == -1) |
| iderror(0, 0, s, ID_UNKNOWN); |
| osname = un.sysname; |
| } |
| |
| /* |
| * We're going to prepare for and execute reception of a |
| * packet of data from the user. The data is in the format |
| * "local_port , foreign_port\r\n" (with local being the |
| * server's port and foreign being the client's.) |
| */ |
| gettimeofday(&to, NULL); |
| to.tv_sec += tv.tv_sec; |
| to.tv_usec += tv.tv_usec; |
| if (to.tv_usec >= 1000000) { |
| to.tv_usec -= 1000000; |
| to.tv_sec++; |
| } |
| |
| size = 0; |
| bufsiz = sizeof(buf) - 1; |
| FD_ZERO(&fdset); |
| while (bufsiz > 0) { |
| gettimeofday(&tv, NULL); |
| tv.tv_sec = to.tv_sec - tv.tv_sec; |
| tv.tv_usec = to.tv_usec - tv.tv_usec; |
| if (tv.tv_usec < 0) { |
| tv.tv_usec += 1000000; |
| tv.tv_sec--; |
| } |
| if (tv.tv_sec < 0) |
| break; |
| FD_SET(s, &fdset); |
| if (select(s + 1, &fdset, NULL, NULL, &tv) == -1) |
| iderror(0, 0, s, ID_UNKNOWN); |
| if (ioctl(s, FIONREAD, &onreadlen) == -1) |
| iderror(0, 0, s, ID_UNKNOWN); |
| if ((size_t)onreadlen > bufsiz) |
| onreadlen = bufsiz; |
| ssize = read(s, &buf[size], (size_t)onreadlen); |
| if (ssize == -1) |
| iderror(0, 0, s, ID_UNKNOWN); |
| else if (ssize == 0) |
| break; |
| bufsiz -= ssize; |
| size += ssize; |
| if (memchr(&buf[size - ssize], '\n', ssize) != NULL) |
| break; |
| } |
| buf[size] = '\0'; |
| /* Read two characters, and check for a delimiting character */ |
| if (sscanf(buf, "%hu , %hu%c", &lport, &fport, &e) != 3 || isdigit(e)) |
| iderror(0, 0, s, ID_INVALID); |
| |
| /* Send garbage? */ |
| if (gflag) |
| goto printit; |
| |
| /* |
| * If not "real" (-r), send a HIDDEN-USER error for everything. |
| * If -d is used to set a fallback username, this is used to |
| * override it, and the fallback is returned instead. |
| */ |
| if (!rflag) { |
| if (*idbuf == '\0') |
| iderror(lport, fport, s, ID_HIDDEN); |
| goto printit; |
| } |
| |
| /* |
| * We take the input and construct an array of two sockaddr_ins |
| * which contain the local address information and foreign |
| * address information, respectively, used to look up the |
| * credentials for the socket (which are returned by the |
| * sysctl "net.inet.tcp.getcred" when we call it.) |
| */ |
| socklen = sizeof(ss[0]); |
| if (getsockname(s, (struct sockaddr *)&ss[0], &socklen) == -1) |
| iderror(lport, fport, s, ID_UNKNOWN); |
| socklen = sizeof(ss[1]); |
| if (getpeername(s, (struct sockaddr *)&ss[1], &socklen) == -1) |
| iderror(lport, fport, s, ID_UNKNOWN); |
| if (ss[0].ss_family != ss[1].ss_family) |
| iderror(lport, fport, s, ID_UNKNOWN); |
| size = sizeof(uc); |
| switch (ss[0].ss_family) { |
| case AF_INET: |
| sin4[0] = *(struct sockaddr_in *)&ss[0]; |
| sin4[0].sin_port = htons(lport); |
| sin4[1] = *(struct sockaddr_in *)&ss[1]; |
| sin4[1].sin_port = htons(fport); |
| if (sysctlbyname("net.inet.tcp.getcred", &uc, &size, sin4, |
| sizeof(sin4)) == -1) |
| getcredfail = errno; |
| break; |
| #ifdef INET6 |
| case AF_INET6: |
| sin6[0] = *(struct sockaddr_in6 *)&ss[0]; |
| sin6[0].sin6_port = htons(lport); |
| sin6[1] = *(struct sockaddr_in6 *)&ss[1]; |
| sin6[1].sin6_port = htons(fport); |
| if (sysctlbyname("net.inet6.tcp6.getcred", &uc, &size, sin6, |
| sizeof(sin6)) == -1) |
| getcredfail = errno; |
| break; |
| #endif |
| default: /* should not reach here */ |
| getcredfail = EAFNOSUPPORT; |
| break; |
| } |
| if (getcredfail != 0) { |
| if (*idbuf == '\0') |
| iderror(lport, fport, s, |
| getcredfail == ENOENT ? ID_NOUSER : ID_UNKNOWN); |
| goto printit; |
| } |
| |
| /* Look up the pw to get the username and home directory*/ |
| errno = 0; |
| pw = getpwuid(uc.cr_uid); |
| if (pw == NULL) |
| iderror(lport, fport, s, errno == 0 ? ID_NOUSER : ID_UNKNOWN); |
| |
| if (iflag) |
| snprintf(idbuf, sizeof(idbuf), "%u", (unsigned)pw->pw_uid); |
| else |
| strlcpy(idbuf, pw->pw_name, sizeof(idbuf)); |
| |
| /* |
| * If enabled, we check for a file named ".noident" in the user's |
| * home directory. If found, we return HIDDEN-USER. |
| */ |
| if (nflag) { |
| if (asprintf(&p, "%s/.noident", pw->pw_dir) == -1) |
| iderror(lport, fport, s, ID_UNKNOWN); |
| if (lstat(p, &sb) == 0) { |
| free(p); |
| iderror(lport, fport, s, ID_HIDDEN); |
| } |
| free(p); |
| } |
| |
| /* |
| * Here, if enabled, we read a user's ".fakeid" file in their |
| * home directory. It consists of a line containing the name |
| * they want. |
| */ |
| if (fflag) { |
| int fakeid_fd; |
| |
| /* |
| * Here we set ourself to effectively be the user, so we don't |
| * open any files we have no permission to open, especially |
| * symbolic links to sensitive root-owned files or devices. |
| */ |
| if (initgroups(pw->pw_name, pw->pw_gid) == -1) |
| iderror(lport, fport, s, ID_UNKNOWN); |
| if (seteuid(pw->pw_uid) == -1) |
| iderror(lport, fport, s, ID_UNKNOWN); |
| /* |
| * We can't stat() here since that would be a race |
| * condition. |
| * Therefore, we open the file we have permissions to open |
| * and if it's not a regular file, we close it and end up |
| * returning the user's real username. |
| */ |
| if (asprintf(&p, "%s/.fakeid", pw->pw_dir) == -1) |
| iderror(lport, fport, s, ID_UNKNOWN); |
| fakeid_fd = open(p, O_RDONLY | O_NONBLOCK); |
| free(p); |
| if (fakeid_fd == -1 || fstat(fakeid_fd, &sb) == -1 || |
| !S_ISREG(sb.st_mode)) |
| goto fakeid_fail; |
| |
| if ((ssize = read(fakeid_fd, buf, sizeof(buf) - 1)) < 0) |
| goto fakeid_fail; |
| buf[ssize] = '\0'; |
| |
| /* |
| * Usually, the file will have the desired identity |
| * in the form "identity\n". Allow for leading white |
| * space and trailing white space/end of line. |
| */ |
| p = buf; |
| p += strspn(p, " \t"); |
| p[strcspn(p, " \t\r\n")] = '\0'; |
| if (strlen(p) > MAXLOGNAME - 1) /* Too long (including nul)? */ |
| p[MAXLOGNAME - 1] = '\0'; |
| |
| /* |
| * If the name is a zero-length string or matches it |
| * the id or name of another user (unless permitted by -F) |
| * then it is invalid. |
| */ |
| if (*p == '\0') |
| goto fakeid_fail; |
| if (!Fflag) { |
| if (iflag) { |
| if (p[strspn(p, "0123456789")] == '\0' && |
| getpwuid(atoi(p)) != NULL) |
| goto fakeid_fail; |
| } else { |
| if (getpwnam(p) != NULL) |
| goto fakeid_fail; |
| } |
| } |
| |
| strlcpy(idbuf, p, sizeof(idbuf)); |
| |
| fakeid_fail: |
| if (fakeid_fd != -1) |
| close(fakeid_fd); |
| } |
| |
| printit: |
| /* Finally, we make and send the reply. */ |
| if (asprintf(&p, "%d , %d : USERID : %s : %s\r\n", lport, fport, osname, |
| idbuf) == -1) { |
| syslog(LOG_ERR, "asprintf: %m"); |
| exit(EX_OSERR); |
| } |
| send(s, p, strlen(p), MSG_EOF); |
| free(p); |
| |
| exit(0); |
| } |
| |
| /* |
| * RFC738 Time Server. |
| * Return a machine readable date and time, in the form of the |
| * number of seconds since midnight, Jan 1, 1900. Since gettimeofday |
| * returns the number of seconds since midnight, Jan 1, 1970, |
| * we must add 2208988800 seconds to this figure to make up for |
| * some seventy years Bell Labs was asleep. |
| */ |
| |
| unsigned long |
| machtime() |
| { |
| struct timeval tv; |
| |
| if (gettimeofday(&tv, (struct timezone *)NULL) < 0) { |
| if (debug) |
| warnx("unable to get time of day"); |
| return (0L); |
| } |
| #define OFFSET ((u_long)25567 * 24*60*60) |
| return (htonl((long)(tv.tv_sec + OFFSET))); |
| #undef OFFSET |
| } |
| |
| /* ARGSUSED */ |
| void |
| machtime_dg(s, sep) |
| int s; |
| struct servtab *sep; |
| { |
| unsigned long result; |
| struct sockaddr_storage ss; |
| socklen_t size; |
| |
| size = sizeof(ss); |
| if (recvfrom(s, (char *)&result, sizeof(result), 0, |
| (struct sockaddr *)&ss, &size) < 0) |
| return; |
| |
| if (check_loop((struct sockaddr *)&ss, sep)) |
| return; |
| |
| result = machtime(); |
| (void) sendto(s, (char *) &result, sizeof(result), 0, |
| (struct sockaddr *)&ss, size); |
| } |
| |
| /* ARGSUSED */ |
| void |
| machtime_stream(s, sep) |
| int s; |
| struct servtab *sep __unused; |
| { |
| unsigned long result; |
| |
| result = machtime(); |
| (void) send(s, (char *) &result, sizeof(result), MSG_EOF); |
| } |
| |
| /* |
| * RFC1078 TCP Port Service Multiplexer (TCPMUX). Service connections to |
| * services based on the service name sent. |
| * |
| * Based on TCPMUX.C by Mark K. Lottor November 1988 |
| * sri-nic::ps:<mkl>tcpmux.c |
| */ |
| |
| #define MAX_SERV_LEN (256+2) /* 2 bytes for \r\n */ |
| #define strwrite(fd, buf) (void) write(fd, buf, sizeof(buf)-1) |
| |
| static int /* # of characters upto \r,\n or \0 */ |
| getline(fd, buf, len) |
| int fd; |
| char *buf; |
| int len; |
| { |
| int count = 0, n; |
| struct sigaction sa; |
| |
| sa.sa_flags = 0; |
| sigemptyset(&sa.sa_mask); |
| sa.sa_handler = SIG_DFL; |
| sigaction(SIGALRM, &sa, (struct sigaction *)0); |
| do { |
| alarm(10); |
| n = read(fd, buf, len-count); |
| alarm(0); |
| if (n == 0) |
| return (count); |
| if (n < 0) |
| return (-1); |
| while (--n >= 0) { |
| if (*buf == '\r' || *buf == '\n' || *buf == '\0') |
| return (count); |
| count++; |
| buf++; |
| } |
| } while (count < len); |
| return (count); |
| } |
| |
| struct servtab * |
| tcpmux(s) |
| int s; |
| { |
| struct servtab *sep; |
| char service[MAX_SERV_LEN+1]; |
| int len; |
| |
| /* Get requested service name */ |
| if ((len = getline(s, service, MAX_SERV_LEN)) < 0) { |
| strwrite(s, "-Error reading service name\r\n"); |
| return (NULL); |
| } |
| service[len] = '\0'; |
| |
| if (debug) |
| warnx("tcpmux: someone wants %s", service); |
| |
| /* |
| * Help is a required command, and lists available services, |
| * one per line. |
| */ |
| if (!strcasecmp(service, "help")) { |
| for (sep = servtab; sep; sep = sep->se_next) { |
| if (!ISMUX(sep)) |
| continue; |
| (void)write(s,sep->se_service,strlen(sep->se_service)); |
| strwrite(s, "\r\n"); |
| } |
| return (NULL); |
| } |
| |
| /* Try matching a service in inetd.conf with the request */ |
| for (sep = servtab; sep; sep = sep->se_next) { |
| if (!ISMUX(sep)) |
| continue; |
| if (!strcasecmp(service, sep->se_service)) { |
| if (ISMUXPLUS(sep)) { |
| strwrite(s, "+Go\r\n"); |
| } |
| return (sep); |
| } |
| } |
| strwrite(s, "-Service not available\r\n"); |
| return (NULL); |
| } |