11590Srgrimes/* 21590Srgrimes * Copyright (c) 1983, 1990, 1993 31590Srgrimes * The Regents of the University of California. All rights reserved. 496196Sdes * Copyright (c) 2002 Networks Associates Technology, Inc. 596196Sdes * All rights reserved. 61590Srgrimes * 796196Sdes * Portions of this software were developed for the FreeBSD Project by 896196Sdes * ThinkSec AS and NAI Labs, the Security Research Division of Network 996196Sdes * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 1096196Sdes * ("CBOSS"), as part of the DARPA CHATS research program. 1196196Sdes * 121590Srgrimes * Redistribution and use in source and binary forms, with or without 131590Srgrimes * modification, are permitted provided that the following conditions 141590Srgrimes * are met: 151590Srgrimes * 1. Redistributions of source code must retain the above copyright 161590Srgrimes * notice, this list of conditions and the following disclaimer. 171590Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 181590Srgrimes * notice, this list of conditions and the following disclaimer in the 191590Srgrimes * documentation and/or other materials provided with the distribution. 201590Srgrimes * 3. All advertising materials mentioning features or use of this software 211590Srgrimes * must display the following acknowledgement: 221590Srgrimes * This product includes software developed by the University of 231590Srgrimes * California, Berkeley and its contributors. 241590Srgrimes * 4. Neither the name of the University nor the names of its contributors 251590Srgrimes * may be used to endorse or promote products derived from this software 261590Srgrimes * without specific prior written permission. 271590Srgrimes * 281590Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 291590Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 301590Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 311590Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 321590Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 331590Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 341590Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 351590Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 361590Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 371590Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 381590Srgrimes * SUCH DAMAGE. 391590Srgrimes */ 401590Srgrimes 411590Srgrimes#ifndef lint 4227919Scharnierstatic const char copyright[] = 431590Srgrimes"@(#) Copyright (c) 1983, 1990, 1993\n\ 441590Srgrimes The Regents of the University of California. All rights reserved.\n"; 451590Srgrimes#endif /* not lint */ 461590Srgrimes 47105235Scharnier#if 0 481590Srgrimes#ifndef lint 4929922Smarkmstatic const char sccsid[] = "@(#)rlogin.c 8.1 (Berkeley) 6/6/93"; 501590Srgrimes#endif /* not lint */ 51105235Scharnier#endif 521590Srgrimes 53105235Scharnier#include <sys/cdefs.h> 54105235Scharnier__FBSDID("$FreeBSD$"); 55105235Scharnier 561590Srgrimes/* 571590Srgrimes * rlogin - remote login 581590Srgrimes */ 5995621Smarkm 601590Srgrimes#include <sys/param.h> 61120547Stjr#include <sys/ioctl.h> 621590Srgrimes#include <sys/socket.h> 631590Srgrimes#include <sys/time.h> 641590Srgrimes#include <sys/resource.h> 651590Srgrimes#include <sys/wait.h> 661590Srgrimes 671590Srgrimes#include <netinet/in.h> 681590Srgrimes#include <netinet/in_systm.h> 691590Srgrimes#include <netinet/ip.h> 708232Sdg#include <netinet/tcp.h> 711590Srgrimes 7227919Scharnier#include <err.h> 731590Srgrimes#include <errno.h> 741590Srgrimes#include <fcntl.h> 751590Srgrimes#include <netdb.h> 76200462Sdelphij#include <paths.h> 771590Srgrimes#include <pwd.h> 781590Srgrimes#include <setjmp.h> 79120547Stjr#include <termios.h> 801590Srgrimes#include <signal.h> 811590Srgrimes#include <stdio.h> 821590Srgrimes#include <stdlib.h> 831590Srgrimes#include <string.h> 841590Srgrimes#include <unistd.h> 851590Srgrimes 861590Srgrimes#ifndef TIOCPKT_WINDOW 871590Srgrimes#define TIOCPKT_WINDOW 0x80 881590Srgrimes#endif 891590Srgrimes 901590Srgrimes/* concession to Sun */ 911590Srgrimes#ifndef SIGUSR1 921590Srgrimes#define SIGUSR1 30 931590Srgrimes#endif 941590Srgrimes 95120547Stjrint eight, rem; 96120547Stjrstruct termios deftty; 97120547Stjr 9857232Sshinint family = PF_UNSPEC; 991590Srgrimes 1001590Srgrimesint noescape; 1011590Srgrimesu_char escapechar = '~'; 1021590Srgrimes 1031590Srgrimes#define get_window_size(fd, wp) ioctl(fd, TIOCGWINSZ, wp) 1041590Srgrimesstruct winsize winsize; 1051590Srgrimes 10692921Simpvoid catch_child(int); 10792921Simpvoid copytochild(int); 10892921Simpvoid doit(long) __dead2; 10992921Simpvoid done(int) __dead2; 11092921Simpvoid echo(char); 111105268Smarkmu_int getescape(const char *); 11292921Simpvoid lostpeer(int); 11392921Simpvoid mode(int); 11495621Smarkmvoid msg(const char *); 11592921Simpvoid oob(int); 11692921Simpint reader(int); 11792921Simpvoid sendwindow(void); 11892921Simpvoid setsignal(int); 11992921Simpvoid sigwinch(int); 12092921Simpvoid stop(char); 12192921Simpvoid usage(void) __dead2; 12292921Simpvoid writer(void); 12392921Simpvoid writeroob(int); 1241590Srgrimes 1251590Srgrimesint 12693057Simpmain(int argc, char *argv[]) 1271590Srgrimes{ 1281590Srgrimes struct passwd *pw; 1291590Srgrimes struct servent *sp; 130120547Stjr struct termios tty; 1311590Srgrimes long omask; 132105268Smarkm int argoff, ch, dflag, Dflag, one; 133105268Smarkm uid_t uid; 13447549Sbde char *host, *localname, *p, *user, term[1024]; 135120547Stjr speed_t ospeed; 13696196Sdes struct sockaddr_storage ss; 137148726Sstefanf socklen_t sslen; 138152397Sdwmalone size_t len, len2; 139152397Sdwmalone int i; 1401590Srgrimes 1418232Sdg argoff = dflag = Dflag = 0; 1421590Srgrimes one = 1; 14347549Sbde host = localname = user = NULL; 1441590Srgrimes 14529922Smarkm if ((p = rindex(argv[0], '/'))) 1461590Srgrimes ++p; 1471590Srgrimes else 1481590Srgrimes p = argv[0]; 1491590Srgrimes 1501590Srgrimes if (strcmp(p, "rlogin")) 1511590Srgrimes host = p; 1521590Srgrimes 1531590Srgrimes /* handle "rlogin host flags" */ 1541590Srgrimes if (!host && argc > 2 && argv[1][0] != '-') { 1551590Srgrimes host = argv[1]; 1561590Srgrimes argoff = 1; 1571590Srgrimes } 1581590Srgrimes 159140569Sru#define OPTIONS "468DEde:i:l:" 16024360Simp while ((ch = getopt(argc - argoff, argv + argoff, OPTIONS)) != -1) 1611590Srgrimes switch(ch) { 16257232Sshin case '4': 16357232Sshin family = PF_INET; 16457232Sshin break; 16557232Sshin 16657232Sshin case '6': 16757232Sshin family = PF_INET6; 16857232Sshin break; 16957232Sshin 1701590Srgrimes case '8': 1711590Srgrimes eight = 1; 1721590Srgrimes break; 1738232Sdg case 'D': 1748232Sdg Dflag = 1; 1758232Sdg break; 1761590Srgrimes case 'E': 1771590Srgrimes noescape = 1; 1781590Srgrimes break; 1791590Srgrimes case 'd': 1801590Srgrimes dflag = 1; 1811590Srgrimes break; 1821590Srgrimes case 'e': 1831590Srgrimes noescape = 0; 1841590Srgrimes escapechar = getescape(optarg); 1851590Srgrimes break; 18647488Speter case 'i': 18747549Sbde if (getuid() != 0) 18847549Sbde errx(1, "-i user: permission denied"); 18947488Speter localname = optarg; 19047488Speter break; 1911590Srgrimes case 'l': 1921590Srgrimes user = optarg; 1931590Srgrimes break; 1941590Srgrimes case '?': 1951590Srgrimes default: 1961590Srgrimes usage(); 1971590Srgrimes } 1981590Srgrimes optind += argoff; 1991590Srgrimes 2001590Srgrimes /* if haven't gotten a host yet, do so */ 20134897Smarkm if (!host && !(host = argv[optind++])) 2021590Srgrimes usage(); 2031590Srgrimes 20434897Smarkm if (argv[optind]) 2051590Srgrimes usage(); 2061590Srgrimes 20727919Scharnier if (!(pw = getpwuid(uid = getuid()))) 20827919Scharnier errx(1, "unknown user id"); 2091590Srgrimes if (!user) 2101590Srgrimes user = pw->pw_name; 21147488Speter if (!localname) 21247488Speter localname = pw->pw_name; 2131590Srgrimes 2141590Srgrimes sp = NULL; 215105268Smarkm sp = getservbyname("login", "tcp"); 2161590Srgrimes if (sp == NULL) 21727919Scharnier errx(1, "login/tcp: unknown service"); 2181590Srgrimes 219120547Stjr if ((p = getenv("TERM")) != NULL) 220120547Stjr (void)strlcpy(term, p, sizeof(term)); 221120547Stjr len = strlen(term); 222120547Stjr if (len < (sizeof(term) - 1) && tcgetattr(0, &tty) == 0) { 223120547Stjr /* start at 2 to include the / */ 224120547Stjr for (ospeed = i = cfgetospeed(&tty), len2 = 2; i > 9; len2++) 225120547Stjr i /= 10; 226120547Stjr if (len + len2 < sizeof(term)) 227120547Stjr (void)snprintf(term + len, len2 + 1, "/%d", ospeed); 2281590Srgrimes } 2291590Srgrimes 2301590Srgrimes (void)get_window_size(0, &winsize); 2311590Srgrimes 2321590Srgrimes (void)signal(SIGPIPE, lostpeer); 2331590Srgrimes /* will use SIGUSR1 for window size hack, so hold it off */ 2341590Srgrimes omask = sigblock(sigmask(SIGURG) | sigmask(SIGUSR1)); 2351590Srgrimes /* 2361590Srgrimes * We set SIGURG and SIGUSR1 below so that an 2371590Srgrimes * incoming signal will be held pending rather than being 2381590Srgrimes * discarded. Note that these routines will be ready to get 2391590Srgrimes * a signal by the time that they are unblocked below. 2401590Srgrimes */ 2411590Srgrimes (void)signal(SIGURG, copytochild); 2421590Srgrimes (void)signal(SIGUSR1, writeroob); 2431590Srgrimes 24457232Sshin rem = rcmd_af(&host, sp->s_port, localname, user, term, 0, family); 2451590Srgrimes 2461590Srgrimes if (rem < 0) 2471590Srgrimes exit(1); 2481590Srgrimes 2491590Srgrimes if (dflag && 2501590Srgrimes setsockopt(rem, SOL_SOCKET, SO_DEBUG, &one, sizeof(one)) < 0) 25127919Scharnier warn("setsockopt"); 2528232Sdg if (Dflag && 2538232Sdg setsockopt(rem, IPPROTO_TCP, TCP_NODELAY, &one, sizeof(one)) < 0) 25427919Scharnier warn("setsockopt NODELAY (ignored)"); 2558232Sdg 25656590Sshin sslen = sizeof(ss); 2571590Srgrimes one = IPTOS_LOWDELAY; 25856590Sshin if (getsockname(rem, (struct sockaddr *)&ss, &sslen) == 0 && 25956590Sshin ss.ss_family == AF_INET) { 26056590Sshin if (setsockopt(rem, IPPROTO_IP, IP_TOS, (char *)&one, 26156590Sshin sizeof(int)) < 0) 26256590Sshin warn("setsockopt TOS (ignored)"); 26356590Sshin } else 26456590Sshin if (ss.ss_family == AF_INET) 26556590Sshin warn("setsockopt getsockname failed"); 2661590Srgrimes 2671590Srgrimes (void)setuid(uid); 2681590Srgrimes doit(omask); 2691590Srgrimes /*NOTREACHED*/ 2701590Srgrimes} 2711590Srgrimes 272120547Stjrint child; 2731590Srgrimes 2741590Srgrimesvoid 27593057Simpdoit(long omask) 2761590Srgrimes{ 2771590Srgrimes 2781590Srgrimes (void)signal(SIGINT, SIG_IGN); 2791590Srgrimes setsignal(SIGHUP); 2801590Srgrimes setsignal(SIGQUIT); 281120547Stjr mode(1); 2821590Srgrimes child = fork(); 2831590Srgrimes if (child == -1) { 28427919Scharnier warn("fork"); 2851590Srgrimes done(1); 2861590Srgrimes } 2871590Srgrimes if (child == 0) { 2881590Srgrimes if (reader(omask) == 0) { 289105235Scharnier msg("connection closed"); 2901590Srgrimes exit(0); 2911590Srgrimes } 2921590Srgrimes sleep(1); 293105235Scharnier msg("\007connection closed"); 2941590Srgrimes exit(1); 2951590Srgrimes } 2961590Srgrimes 2971590Srgrimes /* 2981590Srgrimes * We may still own the socket, and may have a pending SIGURG (or might 2991590Srgrimes * receive one soon) that we really want to send to the reader. When 3001590Srgrimes * one of these comes in, the trap copytochild simply copies such 3011590Srgrimes * signals to the child. We can now unblock SIGURG and SIGUSR1 3021590Srgrimes * that were set above. 3031590Srgrimes */ 3041590Srgrimes (void)sigsetmask(omask); 3051590Srgrimes (void)signal(SIGCHLD, catch_child); 3061590Srgrimes writer(); 307105235Scharnier msg("closed connection"); 3081590Srgrimes done(0); 3091590Srgrimes} 3101590Srgrimes 3111590Srgrimes/* trap a signal, unless it is being ignored. */ 3121590Srgrimesvoid 31393057Simpsetsignal(int sig) 3141590Srgrimes{ 3151590Srgrimes int omask = sigblock(sigmask(sig)); 3161590Srgrimes 3171590Srgrimes if (signal(sig, exit) == SIG_IGN) 3181590Srgrimes (void)signal(sig, SIG_IGN); 3191590Srgrimes (void)sigsetmask(omask); 3201590Srgrimes} 3211590Srgrimes 32218286Sbdevoid 32393057Simpdone(int status) 3241590Srgrimes{ 3251590Srgrimes int w, wstatus; 3261590Srgrimes 3271590Srgrimes mode(0); 3281590Srgrimes if (child > 0) { 3291590Srgrimes /* make sure catch_child does not snap it up */ 3301590Srgrimes (void)signal(SIGCHLD, SIG_DFL); 3311590Srgrimes if (kill(child, SIGKILL) >= 0) 3321590Srgrimes while ((w = wait(&wstatus)) > 0 && w != child); 3331590Srgrimes } 3341590Srgrimes exit(status); 3351590Srgrimes} 3361590Srgrimes 3371590Srgrimesint dosigwinch; 3381590Srgrimes 3391590Srgrimes/* 3401590Srgrimes * This is called when the reader process gets the out-of-band (urgent) 3411590Srgrimes * request to turn on the window-changing protocol. 3421590Srgrimes */ 343105268Smarkm/* ARGSUSED */ 3441590Srgrimesvoid 34595621Smarkmwriteroob(int signo __unused) 3461590Srgrimes{ 3471590Srgrimes if (dosigwinch == 0) { 3481590Srgrimes sendwindow(); 3491590Srgrimes (void)signal(SIGWINCH, sigwinch); 3501590Srgrimes } 3511590Srgrimes dosigwinch = 1; 3521590Srgrimes} 3531590Srgrimes 354105268Smarkm/* ARGSUSED */ 3551590Srgrimesvoid 35695621Smarkmcatch_child(int signo __unused) 3571590Srgrimes{ 35897788Smike pid_t pid; 35997788Smike int status; 3601590Srgrimes 3611590Srgrimes for (;;) { 36297788Smike pid = wait3(&status, WNOHANG|WUNTRACED, NULL); 3631590Srgrimes if (pid == 0) 3641590Srgrimes return; 3651590Srgrimes /* if the child (reader) dies, just quit */ 3661590Srgrimes if (pid < 0 || (pid == child && !WIFSTOPPED(status))) 36797788Smike done(WTERMSIG(status) | WEXITSTATUS(status)); 3681590Srgrimes } 3691590Srgrimes /* NOTREACHED */ 3701590Srgrimes} 3711590Srgrimes 3721590Srgrimes/* 3731590Srgrimes * writer: write to remote: 0 -> line. 3741590Srgrimes * ~. terminate 3751590Srgrimes * ~^Z suspend rlogin process. 3761590Srgrimes * ~<delayed-suspend char> suspend rlogin process, but leave reader alone. 3771590Srgrimes */ 3781590Srgrimesvoid 37993057Simpwriter(void) 3801590Srgrimes{ 38193057Simp int bol, local, n; 3821590Srgrimes char c; 3831590Srgrimes 3841590Srgrimes bol = 1; /* beginning of line */ 3851590Srgrimes local = 0; 3861590Srgrimes for (;;) { 3871590Srgrimes n = read(STDIN_FILENO, &c, 1); 3881590Srgrimes if (n <= 0) { 3891590Srgrimes if (n < 0 && errno == EINTR) 3901590Srgrimes continue; 3911590Srgrimes break; 3921590Srgrimes } 3931590Srgrimes /* 3941590Srgrimes * If we're at the beginning of the line and recognize a 3951590Srgrimes * command character, then we echo locally. Otherwise, 3961590Srgrimes * characters are echo'd remotely. If the command character 3971590Srgrimes * is doubled, this acts as a force and local echo is 3981590Srgrimes * suppressed. 3991590Srgrimes */ 4001590Srgrimes if (bol) { 4011590Srgrimes bol = 0; 4021590Srgrimes if (!noescape && c == escapechar) { 4031590Srgrimes local = 1; 4041590Srgrimes continue; 4051590Srgrimes } 4061590Srgrimes } else if (local) { 4071590Srgrimes local = 0; 408120547Stjr if (c == '.' || CCEQ(deftty.c_cc[VEOF], c)) { 4091590Srgrimes echo(c); 4101590Srgrimes break; 4111590Srgrimes } 412120547Stjr if (CCEQ(deftty.c_cc[VSUSP], c) || 413120547Stjr CCEQ(deftty.c_cc[VDSUSP], c)) { 4141590Srgrimes bol = 1; 4151590Srgrimes echo(c); 4161590Srgrimes stop(c); 4171590Srgrimes continue; 4181590Srgrimes } 4191590Srgrimes if (c != escapechar) 420105268Smarkm (void)write(rem, &escapechar, 1); 4211590Srgrimes } 4221590Srgrimes 423105268Smarkm if (write(rem, &c, 1) == 0) { 424105268Smarkm msg("line gone"); 425105268Smarkm break; 426105268Smarkm } 427120547Stjr bol = CCEQ(deftty.c_cc[VKILL], c) || 428120547Stjr CCEQ(deftty.c_cc[VEOF], c) || 429120547Stjr CCEQ(deftty.c_cc[VINTR], c) || 430120547Stjr CCEQ(deftty.c_cc[VSUSP], c) || 4311590Srgrimes c == '\r' || c == '\n'; 4321590Srgrimes } 4331590Srgrimes} 4341590Srgrimes 4351590Srgrimesvoid 43693057Simpecho(char c) 4371590Srgrimes{ 43893057Simp char *p; 4391590Srgrimes char buf[8]; 4401590Srgrimes 4411590Srgrimes p = buf; 4421590Srgrimes c &= 0177; 4431590Srgrimes *p++ = escapechar; 4441590Srgrimes if (c < ' ') { 4451590Srgrimes *p++ = '^'; 4461590Srgrimes *p++ = c + '@'; 4471590Srgrimes } else if (c == 0177) { 4481590Srgrimes *p++ = '^'; 4491590Srgrimes *p++ = '?'; 4501590Srgrimes } else 4511590Srgrimes *p++ = c; 4521590Srgrimes *p++ = '\r'; 4531590Srgrimes *p++ = '\n'; 4541590Srgrimes (void)write(STDOUT_FILENO, buf, p - buf); 4551590Srgrimes} 4561590Srgrimes 4571590Srgrimesvoid 4581590Srgrimesstop(char cmdc) 4591590Srgrimes{ 4601590Srgrimes mode(0); 4611590Srgrimes (void)signal(SIGCHLD, SIG_IGN); 462120547Stjr (void)kill(CCEQ(deftty.c_cc[VSUSP], cmdc) ? 0 : getpid(), SIGTSTP); 4631590Srgrimes (void)signal(SIGCHLD, catch_child); 4641590Srgrimes mode(1); 4651590Srgrimes sigwinch(0); /* check for size changes */ 4661590Srgrimes} 4671590Srgrimes 468105268Smarkm/* ARGSUSED */ 4691590Srgrimesvoid 47095621Smarkmsigwinch(int signo __unused) 4711590Srgrimes{ 4721590Srgrimes struct winsize ws; 4731590Srgrimes 4741590Srgrimes if (dosigwinch && get_window_size(0, &ws) == 0 && 4751590Srgrimes bcmp(&ws, &winsize, sizeof(ws))) { 4761590Srgrimes winsize = ws; 4771590Srgrimes sendwindow(); 4781590Srgrimes } 4791590Srgrimes} 4801590Srgrimes 4811590Srgrimes/* 4821590Srgrimes * Send the window size to the server via the magic escape 4831590Srgrimes */ 4841590Srgrimesvoid 48593057Simpsendwindow(void) 4861590Srgrimes{ 487221079Sjhb struct winsize ws; 4881590Srgrimes char obuf[4 + sizeof (struct winsize)]; 4891590Srgrimes 4901590Srgrimes obuf[0] = 0377; 4911590Srgrimes obuf[1] = 0377; 4921590Srgrimes obuf[2] = 's'; 4931590Srgrimes obuf[3] = 's'; 494221079Sjhb ws.ws_row = htons(winsize.ws_row); 495221079Sjhb ws.ws_col = htons(winsize.ws_col); 496221079Sjhb ws.ws_xpixel = htons(winsize.ws_xpixel); 497221079Sjhb ws.ws_ypixel = htons(winsize.ws_ypixel); 498221079Sjhb bcopy(&ws, obuf + 4, sizeof(ws)); 4991590Srgrimes 500105268Smarkm (void)write(rem, obuf, sizeof(obuf)); 5011590Srgrimes} 5021590Srgrimes 5031590Srgrimes/* 5041590Srgrimes * reader: read from remote: line -> 1 5051590Srgrimes */ 5061590Srgrimes#define READING 1 5071590Srgrimes#define WRITING 2 5081590Srgrimes 5091590Srgrimesjmp_buf rcvtop; 510105268Smarkmint rcvcnt, rcvstate; 511105268Smarkmpid_t ppid; 5121590Srgrimeschar rcvbuf[8 * 1024]; 5131590Srgrimes 514105268Smarkm/* ARGSUSED */ 5151590Srgrimesvoid 51695621Smarkmoob(int signo __unused) 5171590Srgrimes{ 518120547Stjr struct termios tty; 519120547Stjr int atmark, n, rcvd; 5201590Srgrimes char waste[BUFSIZ], mark; 5211590Srgrimes 5221590Srgrimes rcvd = 0; 5231590Srgrimes while (recv(rem, &mark, 1, MSG_OOB) < 0) { 5241590Srgrimes switch (errno) { 5251590Srgrimes case EWOULDBLOCK: 5261590Srgrimes /* 5271590Srgrimes * Urgent data not here yet. It may not be possible 5281590Srgrimes * to send it yet if we are blocked for output and 5291590Srgrimes * our input buffer is full. 5301590Srgrimes */ 53195621Smarkm if (rcvcnt < (int)sizeof(rcvbuf)) { 5321590Srgrimes n = read(rem, rcvbuf + rcvcnt, 5331590Srgrimes sizeof(rcvbuf) - rcvcnt); 5341590Srgrimes if (n <= 0) 5351590Srgrimes return; 5361590Srgrimes rcvd += n; 5371590Srgrimes } else { 5381590Srgrimes n = read(rem, waste, sizeof(waste)); 5391590Srgrimes if (n <= 0) 5401590Srgrimes return; 5411590Srgrimes } 5421590Srgrimes continue; 5431590Srgrimes default: 5441590Srgrimes return; 5451590Srgrimes } 5461590Srgrimes } 5471590Srgrimes if (mark & TIOCPKT_WINDOW) { 5481590Srgrimes /* Let server know about window size changes */ 5491590Srgrimes (void)kill(ppid, SIGUSR1); 5501590Srgrimes } 5511590Srgrimes if (!eight && (mark & TIOCPKT_NOSTOP)) { 552120547Stjr (void)tcgetattr(0, &tty); 553120547Stjr tty.c_iflag &= ~IXON; 554120547Stjr (void)tcsetattr(0, TCSANOW, &tty); 5551590Srgrimes } 5561590Srgrimes if (!eight && (mark & TIOCPKT_DOSTOP)) { 557120547Stjr (void)tcgetattr(0, &tty); 558120547Stjr tty.c_iflag |= (deftty.c_iflag & IXON); 559120547Stjr (void)tcsetattr(0, TCSANOW, &tty); 5601590Srgrimes } 5611590Srgrimes if (mark & TIOCPKT_FLUSHWRITE) { 562120547Stjr (void)tcflush(1, TCIOFLUSH); 5631590Srgrimes for (;;) { 5641590Srgrimes if (ioctl(rem, SIOCATMARK, &atmark) < 0) { 56527919Scharnier warn("ioctl"); 5661590Srgrimes break; 5671590Srgrimes } 5681590Srgrimes if (atmark) 5691590Srgrimes break; 5701590Srgrimes n = read(rem, waste, sizeof (waste)); 5711590Srgrimes if (n <= 0) 5721590Srgrimes break; 5731590Srgrimes } 5741590Srgrimes /* 5751590Srgrimes * Don't want any pending data to be output, so clear the recv 5761590Srgrimes * buffer. If we were hanging on a write when interrupted, 5771590Srgrimes * don't want it to restart. If we were reading, restart 5781590Srgrimes * anyway. 5791590Srgrimes */ 5801590Srgrimes rcvcnt = 0; 5811590Srgrimes longjmp(rcvtop, 1); 5821590Srgrimes } 5831590Srgrimes 5841590Srgrimes /* oob does not do FLUSHREAD (alas!) */ 5851590Srgrimes 5861590Srgrimes /* 5871590Srgrimes * If we filled the receive buffer while a read was pending, longjmp 5881590Srgrimes * to the top to restart appropriately. Don't abort a pending write, 5891590Srgrimes * however, or we won't know how much was written. 5901590Srgrimes */ 5911590Srgrimes if (rcvd && rcvstate == READING) 5921590Srgrimes longjmp(rcvtop, 1); 5931590Srgrimes} 5941590Srgrimes 5951590Srgrimes/* reader: read from remote: line -> 1 */ 5961590Srgrimesint 59793057Simpreader(int omask) 5981590Srgrimes{ 599105268Smarkm int n, remaining; 6001590Srgrimes char *bufp; 601105268Smarkm pid_t pid; 6021590Srgrimes 603105268Smarkm pid = getpid(); 6041590Srgrimes (void)signal(SIGTTOU, SIG_IGN); 6051590Srgrimes (void)signal(SIGURG, oob); 60691434Sfenner (void)signal(SIGUSR1, oob); /* When propogating SIGURG from parent */ 6071590Srgrimes ppid = getppid(); 6081590Srgrimes (void)fcntl(rem, F_SETOWN, pid); 6091590Srgrimes (void)setjmp(rcvtop); 6101590Srgrimes (void)sigsetmask(omask); 6111590Srgrimes bufp = rcvbuf; 6121590Srgrimes for (;;) { 6131590Srgrimes while ((remaining = rcvcnt - (bufp - rcvbuf)) > 0) { 6141590Srgrimes rcvstate = WRITING; 6151590Srgrimes n = write(STDOUT_FILENO, bufp, remaining); 6161590Srgrimes if (n < 0) { 6171590Srgrimes if (errno != EINTR) 6181590Srgrimes return (-1); 6191590Srgrimes continue; 6201590Srgrimes } 6211590Srgrimes bufp += n; 6221590Srgrimes } 6231590Srgrimes bufp = rcvbuf; 6241590Srgrimes rcvcnt = 0; 6251590Srgrimes rcvstate = READING; 6261590Srgrimes 627105268Smarkm rcvcnt = read(rem, rcvbuf, sizeof (rcvbuf)); 6281590Srgrimes if (rcvcnt == 0) 6291590Srgrimes return (0); 6301590Srgrimes if (rcvcnt < 0) { 6311590Srgrimes if (errno == EINTR) 6321590Srgrimes continue; 63327919Scharnier warn("read"); 6341590Srgrimes return (-1); 6351590Srgrimes } 6361590Srgrimes } 6371590Srgrimes} 6381590Srgrimes 6391590Srgrimesvoid 64093057Simpmode(int f) 6411590Srgrimes{ 642120547Stjr struct termios tty; 6431590Srgrimes 644120547Stjr switch (f) { 6451590Srgrimes case 0: 646120547Stjr (void)tcsetattr(0, TCSANOW, &deftty); 6471590Srgrimes break; 6481590Srgrimes case 1: 649120547Stjr (void)tcgetattr(0, &deftty); 650120547Stjr tty = deftty; 651120547Stjr /* This is loosely derived from sys/kern/tty_compat.c. */ 652120547Stjr tty.c_lflag &= ~(ECHO|ICANON|ISIG|IEXTEN); 653120547Stjr tty.c_iflag &= ~ICRNL; 654120547Stjr tty.c_oflag &= ~OPOST; 655120547Stjr tty.c_cc[VMIN] = 1; 656120547Stjr tty.c_cc[VTIME] = 0; 657120547Stjr if (eight) { 658120547Stjr tty.c_iflag &= IXOFF; 659120547Stjr tty.c_cflag &= ~(CSIZE|PARENB); 660120547Stjr tty.c_cflag |= CS8; 661120547Stjr } 662120547Stjr (void)tcsetattr(0, TCSANOW, &tty); 6631590Srgrimes break; 6641590Srgrimes default: 6651590Srgrimes return; 6661590Srgrimes } 6671590Srgrimes} 6681590Srgrimes 669105268Smarkm/* ARGSUSED */ 6701590Srgrimesvoid 67195621Smarkmlostpeer(int signo __unused) 6721590Srgrimes{ 6731590Srgrimes (void)signal(SIGPIPE, SIG_IGN); 674105235Scharnier msg("\007connection closed"); 6751590Srgrimes done(1); 6761590Srgrimes} 6771590Srgrimes 67891434Sfenner/* copy SIGURGs to the child process via SIGUSR1. */ 679105268Smarkm/* ARGSUSED */ 6801590Srgrimesvoid 68195621Smarkmcopytochild(int signo __unused) 6821590Srgrimes{ 68391434Sfenner (void)kill(child, SIGUSR1); 6841590Srgrimes} 6851590Srgrimes 6861590Srgrimesvoid 68795621Smarkmmsg(const char *str) 6881590Srgrimes{ 6891590Srgrimes (void)fprintf(stderr, "rlogin: %s\r\n", str); 6901590Srgrimes} 6911590Srgrimes 6921590Srgrimesvoid 69393057Simpusage(void) 6941590Srgrimes{ 6951590Srgrimes (void)fprintf(stderr, 69657232Sshin "usage: rlogin [-46%s]%s[-e char] [-i localname] [-l username] host\n", 697120547Stjr "8DEd", " "); 6981590Srgrimes exit(1); 6991590Srgrimes} 7001590Srgrimes 7011590Srgrimesu_int 702105268Smarkmgetescape(const char *p) 7031590Srgrimes{ 7041590Srgrimes long val; 705105268Smarkm size_t len; 7061590Srgrimes 7071590Srgrimes if ((len = strlen(p)) == 1) /* use any single char, including '\' */ 7081590Srgrimes return ((u_int)*p); 7091590Srgrimes /* otherwise, \nnn */ 7101590Srgrimes if (*p == '\\' && len >= 2 && len <= 4) { 7111590Srgrimes val = strtol(++p, NULL, 8); 7121590Srgrimes for (;;) { 7131590Srgrimes if (!*++p) 7141590Srgrimes return ((u_int)val); 7151590Srgrimes if (*p < '0' || *p > '8') 7161590Srgrimes break; 7171590Srgrimes } 7181590Srgrimes } 7191590Srgrimes msg("illegal option value -- e"); 7201590Srgrimes usage(); 7211590Srgrimes /* NOTREACHED */ 7221590Srgrimes} 723