/* agetty.c - another getty program for Linux. By W. Z. Venema 1989 Ported to Linux by Peter Orbaek This program is freely distributable. The entire man-page used to be here. Now read the real man-page agetty.8 instead. -f option added by Eric Rasmussen - 12/28/95 1999-02-22 Arkadiusz Mi¶kiewicz - added Native Language Support 1999-05-05 Thorsten Kranzkowski - enable hardware flow control before displaying /etc/issue */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "strutils.h" #include "nls.h" #include "pathnames.h" #include "c.h" #if defined(__FreeBSD_kernel__) #include #endif #if defined(__linux__) || defined(__FreeBSD_kernel__) #include #define USE_SYSLOG #endif /* If USE_SYSLOG is undefined all diagnostics go directly to /dev/console. */ #ifdef USE_SYSLOG #include #endif /* * Some heuristics to find out what environment we are in: if it is not * System V, assume it is SunOS 4. */ #ifdef LOGIN_PROCESS /* defined in System V utmp.h */ #define SYSV_STYLE /* select System V style getty */ #endif /* * Things you may want to modify. * * If ISSUE is not defined, agetty will never display the contents of the * /etc/issue file. You will not want to spit out large "issue" files at the * wrong baud rate. Relevant for System V only. * * You may disagree with the default line-editing etc. characters defined * below. Note, however, that DEL cannot be used for interrupt generation * and for line editing at the same time. */ #ifdef SYSV_STYLE #define ISSUE "/etc/issue" /* displayed before the login prompt */ #include #endif #define LOGIN " login: " /* login prompt */ /* Some shorthands for control characters. */ #define CTL(x) (x ^ 0100) /* Assumes ASCII dialect */ #define CR CTL('M') /* carriage return */ #define NL CTL('J') /* line feed */ #define BS CTL('H') /* back space */ #define DEL CTL('?') /* delete */ /* Defaults for line-editing etc. characters; you may want to change this. */ #define DEF_ERASE DEL /* default erase character */ #define DEF_INTR CTL('C') /* default interrupt character */ #define DEF_QUIT CTL('\\') /* default quit char */ #define DEF_KILL CTL('U') /* default kill char */ #define DEF_EOF CTL('D') /* default EOF char */ #define DEF_EOL 0 #define DEF_SWITCH 0 /* default switch char */ #ifndef MAXHOSTNAMELEN # ifdef HOST_NAME_MAX # define MAXHOSTNAMELEN HOST_NAME_MAX # else # define MAXHOSTNAMELEN 64 # endif #endif /* * When multiple baud rates are specified on the command line, the first one * we will try is the first one specified. */ #define FIRST_SPEED 0 /* Storage for command-line options. */ #define MAX_SPEED 10 /* max. nr. of baud rates */ struct options { int flags; /* toggle switches, see below */ int timeout; /* time-out period */ char *login; /* login program */ char *tty; /* name of tty */ char *initstring; /* modem init string */ char *issue; /* alternative issue file */ int numspeed; /* number of baud rates to try */ int speeds[MAX_SPEED]; /* baud rates to be tried */ int eightbits; /* assume 8bit-clean tty */ }; #define F_PARSE (1<<0) /* process modem status messages */ #define F_ISSUE (1<<1) /* display /etc/issue */ #define F_RTSCTS (1<<2) /* enable RTS/CTS flow control */ #define F_LOCAL (1<<3) /* force local */ #define F_INITSTRING (1<<4) /* initstring is set */ #define F_WAITCRLF (1<<5) /* wait for CR or LF */ #define F_CUSTISSUE (1<<6) /* give alternative issue file */ #define F_NOPROMPT (1<<7) /* don't ask for login name! */ #define F_LCUC (1<<8) /* Support for *LCUC stty modes */ #define F_KEEPSPEED (1<<9) /* Follow baud rate from kernel */ #define F_KEEPCFLAGS (1<<10) /* Reuse c_cflags setup from kernel */ /* Storage for things detected while the login name was read. */ struct chardata { int erase; /* erase character */ int kill; /* kill character */ int eol; /* end-of-line character */ int parity; /* what parity did we see */ int capslock; /* upper case without lower case */ }; /* Initial values for the above. */ struct chardata init_chardata = { DEF_ERASE, /* default erase character */ DEF_KILL, /* default kill character */ 13, /* default eol char */ 0, /* space parity */ 0, /* no capslock */ }; struct Speedtab { long speed; int code; }; static struct Speedtab speedtab[] = { { 50, B50 }, { 75, B75 }, { 110, B110 }, { 134, B134 }, { 150, B150 }, { 200, B200 }, { 300, B300 }, { 600, B600 }, { 1200, B1200 }, { 1800, B1800 }, { 2400, B2400 }, { 4800, B4800 }, { 9600, B9600 }, #ifdef B19200 { 19200, B19200 }, #endif #ifdef B38400 { 38400, B38400 }, #endif #ifdef EXTA { 19200, EXTA }, #endif #ifdef EXTB { 38400, EXTB }, #endif #ifdef B57600 { 57600, B57600 }, #endif #ifdef B115200 { 115200, B115200 }, #endif #ifdef B230400 { 230400, B230400 }, #endif { 0, 0 }, }; #define P_(s) s int main P_((int argc, char **argv)); void parse_args P_((int argc, char **argv, struct options *op)); void parse_speeds P_((struct options *op, char *arg)); void update_utmp P_((char *line)); void open_tty P_((char *tty, struct termios *tp, int local)); void termio_init P_((struct termios *tp, struct options *op)); void auto_baud P_((struct termios *tp)); void do_prompt P_((struct options *op, struct termios *tp)); void next_speed P_((struct termios *tp, struct options *op)); char *get_logname P_((struct options *op, struct chardata *cp, struct termios *tp)); void termio_final P_((struct options *op, struct termios *tp, struct chardata *cp)); int caps_lock P_((char *s)); int bcode P_((char *s)); void usage P_((void)); void error P_((const char *, ...)); #undef P_ /* The following is used for understandable diagnostics. */ char *progname; /* Fake hostname for ut_host specified on command line. */ char *fakehost = NULL; /* ... */ #ifdef DEBUGGING #define debug(s) fprintf(dbf,s); fflush(dbf) FILE *dbf; #else #define debug(s) /* nothing */ #endif int main(argc, argv) int argc; char **argv; { char *logname = NULL; /* login name, given to /bin/login */ struct chardata chardata; /* set by get_logname() */ struct termios termios; /* terminal mode bits */ static struct options options = { F_ISSUE, /* show /etc/issue (SYSV_STYLE) */ 0, /* no timeout */ _PATH_LOGIN, /* default login program */ "tty1", /* default tty line */ "", /* modem init string */ ISSUE, /* default issue file */ 0, /* no baud rates known yet */ }; setlocale(LC_ALL, ""); bindtextdomain(PACKAGE, LOCALEDIR); textdomain(PACKAGE); /* The BSD-style init command passes us a useless process name. */ #ifdef SYSV_STYLE { char *ptr; progname = argv[0]; if ((ptr = strrchr(argv[0], '/'))) progname = ++ptr; } #else progname = "agetty"; #endif #ifdef DEBUGGING dbf = fopen("/dev/ttyp0", "w"); { int i; for(i = 1; i < argc; i++) { debug(argv[i]); } } #endif /* Parse command-line arguments. */ parse_args(argc, argv, &options); #if defined (__linux__) || defined(__FreeBSD_kernel__) setsid(); #endif /* Update the utmp file. */ #ifdef SYSV_STYLE update_utmp(options.tty); #endif debug("calling open_tty\n"); /* Open the tty as standard { input, output, error }. */ open_tty(options.tty, &termios, options.flags & F_LOCAL); tcsetpgrp(0, getpid()); /* Initialize the termios settings (raw mode, eight-bit, blocking i/o). */ debug("calling termio_init\n"); termio_init(&termios, &options); /* write the modem init string and DON'T flush the buffers */ if (options.flags & F_INITSTRING) { debug("writing init string\n"); ignore_result( write(1, options.initstring, strlen(options.initstring)) ); } if (!(options.flags & F_LOCAL)) { /* go to blocking write mode unless -L is specified */ fcntl(1, F_SETFL, fcntl(1, F_GETFL, 0) & ~O_NONBLOCK); } /* Optionally detect the baud rate from the modem status message. */ debug("before autobaud\n"); if (options.flags & F_PARSE) auto_baud(&termios); /* Set the optional timer. */ if (options.timeout) (void) alarm((unsigned) options.timeout); /* optionally wait for CR or LF before writing /etc/issue */ if (options.flags & F_WAITCRLF) { char ch; debug("waiting for cr-lf\n"); while(read(0, &ch, 1) == 1) { ch &= 0x7f; /* strip "parity bit" */ #ifdef DEBUGGING fprintf(dbf, "read %c\n", ch); #endif if (ch == '\n' || ch == '\r') break; } } chardata = init_chardata; if (!(options.flags & F_NOPROMPT)) { /* Read the login name. */ debug("reading login name\n"); while ((logname = get_logname(&options, &chardata, &termios)) == 0) next_speed(&termios, &options); } /* Disable timer. */ if (options.timeout) (void) alarm(0); /* Finalize the termios settings. */ termio_final(&options, &termios, &chardata); /* Now the newline character should be properly written. */ ignore_result( write(1, "\n", 1) ); /* Let the login program take care of password validation. */ (void) execl(options.login, options.login, "--", logname, NULL); error(_("%s: can't exec %s: %m"), options.tty, options.login); } /* parse-args - parse command-line arguments */ void parse_args(argc, argv, op) int argc; char **argv; struct options *op; { extern char *optarg; /* getopt */ extern int optind; /* getopt */ int c; while (isascii(c = getopt(argc, argv, "8cI:LH:f:hil:mst:wUn"))) { switch (c) { case 'c': op->flags |= F_KEEPCFLAGS; break; case '8': op->eightbits = 1; break; case 'I': if (!(op->initstring = malloc(strlen(optarg)+1))) { error(_("can't malloc initstring")); break; } { char ch, *p, *q; int i; /* copy optarg into op->initstring decoding \ddd octal codes into chars */ q = op->initstring; p = optarg; while (*p) { if (*p == '\\') { /* know \\ means \ */ p++; if (*p == '\\') { ch = '\\'; p++; } else { /* handle \000 - \177 */ ch = 0; for (i = 1; i <= 3; i++) { if (*p >= '0' && *p <= '7') { ch <<= 3; ch += *p - '0'; p++; } else break; } } *q++ = ch; } else { *q++ = *p++; } } *q = '\0'; } op->flags |= F_INITSTRING; break; case 'L': /* force local */ op->flags |= F_LOCAL; break; case 'H': /* fake login host */ fakehost = optarg; break; case 'f': /* custom issue file */ op->flags |= F_CUSTISSUE; op->issue = optarg; break; case 'h': /* enable h/w flow control */ op->flags |= F_RTSCTS; break; case 'i': /* do not show /etc/issue */ op->flags &= ~F_ISSUE; break; case 'l': op->login = optarg; /* non-default login program */ break; case 'm': /* parse modem status message */ op->flags |= F_PARSE; break; case 'n': op->flags |= F_NOPROMPT; break; case 's': op->flags |= F_KEEPSPEED; /* keep kernel defined speed */ break; case 't': /* time out */ if ((op->timeout = atoi(optarg)) <= 0) error(_("bad timeout value: %s"), optarg); break; case 'w': op->flags |= F_WAITCRLF; break; case 'U': op->flags |= F_LCUC; break; default: usage(); } } debug("after getopt loop\n"); if (argc < optind + 2) /* check parameter count */ usage(); /* we loosen up a bit and accept both "baudrate tty" and "tty baudrate" */ if('0' <= argv[optind][0] && argv[optind][0] <= '9') { /* a number first, assume it's a speed (BSD style) */ parse_speeds(op, argv[optind++]); /* baud rate(s) */ op->tty = argv[optind]; /* tty name */ } else { op->tty = argv[optind++]; /* tty name */ parse_speeds(op, argv[optind]); /* baud rate(s) */ } optind++; if (argc > optind && argv[optind]) setenv ("TERM", argv[optind], 1); #ifdef DO_DEVFS_FIDDLING /* * some devfs junk, following Goswin Brederlow: * turn ttyS into tts/ * turn tty into vc/ */ if (op->tty && strlen(op->tty) < 90) { char dev_name[100]; struct stat st; if (strncmp(op->tty, "ttyS", 4) == 0) { strcpy(dev_name, "/dev/"); strcat(dev_name, op->tty); if (stat(dev_name, &st) < 0) { strcpy(dev_name, "/dev/tts/"); strcat(dev_name, op->tty + 4); if (stat(dev_name, &st) == 0) op->tty = strdup(dev_name + 5); } } else if (strncmp(op->tty, "tty", 3) == 0) { strcpy(dev_name, "/dev/"); strncat(dev_name, op->tty, 90); if (stat(dev_name, &st) < 0) { strcpy(dev_name, "/dev/vc/"); strcat(dev_name, op->tty + 3); if (stat(dev_name, &st) == 0) op->tty = strdup(dev_name + 5); } } } #endif debug("exiting parseargs\n"); } /* parse_speeds - parse alternate baud rates */ void parse_speeds(op, arg) struct options *op; char *arg; { char *cp; debug("entered parse_speeds\n"); for (cp = strtok(arg, ","); cp != 0; cp = strtok((char *) 0, ",")) { if ((op->speeds[op->numspeed++] = bcode(cp)) <= 0) error(_("bad speed: %s"), cp); if (op->numspeed >= MAX_SPEED) error(_("too many alternate speeds")); } debug("exiting parsespeeds\n"); } #ifdef SYSV_STYLE /* update_utmp - update our utmp entry */ void update_utmp(line) char *line; { struct utmp ut; time_t t; int mypid = getpid(); struct utmp *utp; /* * The utmp file holds miscellaneous information about things started by * /sbin/init and other system-related events. Our purpose is to update * the utmp entry for the current process, in particular the process type * and the tty line we are listening to. Return successfully only if the * utmp file can be opened for update, and if we are able to find our * entry in the utmp file. */ utmpname(_PATH_UTMP); setutent(); /* Find mypid in utmp. Earlier code here tested only utp->ut_type != INIT_PROCESS, so maybe the >= here should be >. The present code is taken from login.c, so if this is changed, maybe login has to be changed as well. */ while ((utp = getutent())) if (utp->ut_pid == mypid && utp->ut_type >= INIT_PROCESS && utp->ut_type <= DEAD_PROCESS) break; if (utp) { memcpy(&ut, utp, sizeof(ut)); } else { /* some inits don't initialize utmp... */ memset(&ut, 0, sizeof(ut)); strncpy(ut.ut_id, line + 3, sizeof(ut.ut_id)); } strncpy(ut.ut_user, "LOGIN", sizeof(ut.ut_user)); strncpy(ut.ut_line, line, sizeof(ut.ut_line)); if (fakehost) strncpy(ut.ut_host, fakehost, sizeof(ut.ut_host)); time(&t); ut.ut_time = t; ut.ut_type = LOGIN_PROCESS; ut.ut_pid = mypid; pututline(&ut); endutent(); { #ifdef HAVE_UPDWTMP updwtmp(_PATH_WTMP, &ut); #else int ut_fd; int lf; if ((lf = open(_PATH_WTMPLOCK, O_CREAT|O_WRONLY, 0660)) >= 0) { flock(lf, LOCK_EX); if ((ut_fd = open(_PATH_WTMP, O_APPEND|O_WRONLY)) >= 0) { ignore_result( write(ut_fd, &ut, sizeof(ut)) ); close(ut_fd); } flock(lf, LOCK_UN); close(lf); } #endif } } #endif /* open_tty - set up tty as standard { input, output, error } */ void open_tty(tty, tp, local) char *tty; struct termios *tp; int local; { /* Get rid of the present standard { output, error} if any. */ (void) close(1); (void) close(2); errno = 0; /* ignore above errors */ /* Set up new standard input, unless we are given an already opened port. */ if (strcmp(tty, "-")) { struct stat st; /* Sanity checks... */ if (chdir("/dev")) error(_("/dev: chdir() failed: %m")); if (stat(tty, &st) < 0) error("/dev/%s: %m", tty); if ((st.st_mode & S_IFMT) != S_IFCHR) error(_("/dev/%s: not a character device"), tty); /* Open the tty as standard input. */ (void) close(0); errno = 0; /* ignore close(2) errors */ debug("open(2)\n"); if (open(tty, O_RDWR|O_NONBLOCK, 0) != 0) error(_("/dev/%s: cannot open as standard input: %m"), tty); } else { /* * Standard input should already be connected to an open port. Make * sure it is open for read/write. */ if ((fcntl(0, F_GETFL, 0) & O_RDWR) != O_RDWR) error(_("%s: not open for read/write"), tty); } /* Set up standard output and standard error file descriptors. */ debug("duping\n"); if (dup(0) != 1 || dup(0) != 2) /* set up stdout and stderr */ error(_("%s: dup problem: %m"), tty); /* we have a problem */ /* * The following ioctl will fail if stdin is not a tty, but also when * there is noise on the modem control lines. In the latter case, the * common course of action is (1) fix your cables (2) give the modem more * time to properly reset after hanging up. SunOS users can achieve (2) * by patching the SunOS kernel variable "zsadtrlow" to a larger value; * 5 seconds seems to be a good value. */ if (tcgetattr(0, tp) < 0) error("%s: tcgetattr: %m", tty); /* * login_tty: steal tty from other process group. */ #if defined(__FreeBSD_kernel__) login_tty (0); #endif /* * It seems to be a terminal. Set proper protections and ownership. Mode * 0622 is suitable for SYSV <4 because /bin/login does not change * protections. SunOS 4 login will change the protections to 0620 (write * access for group tty) after the login has succeeded. * * Linux login(1) will change tty permissions. */ /* * Let us use 0600 for Linux for the period between getty and login */ ignore_result( chown(tty, 0, 0) ); /* root, sys */ ignore_result( chmod(tty, 0600) ); /* 0622: crw--w--w- */ errno = 0; /* ignore above errors */ } /* termio_init - initialize termios settings */ char gbuf[1024]; char area[1024]; void termio_init(tp, op) struct termios *tp; struct options *op; { speed_t ispeed, ospeed; if (op->flags & F_KEEPSPEED) { ispeed = cfgetispeed(tp); /* save the original setting */ ospeed = cfgetospeed(tp); } else ospeed = ispeed = op->speeds[FIRST_SPEED]; /* * Initial termios settings: 8-bit characters, raw-mode, blocking i/o. * Special characters are set after we have read the login name; all * reads will be done in raw mode anyway. Errors will be dealt with * lateron. */ /* flush input and output queues, important for modems! */ (void) tcflush(0, TCIOFLUSH); tp->c_iflag = tp->c_lflag = tp->c_oflag = 0; if (!(op->flags & F_KEEPCFLAGS)) tp->c_cflag = CS8 | HUPCL | CREAD | (tp->c_cflag & CLOCAL); /* Note that the speed is stored in the c_cflag termios field, so we have * set the speed always when the cflag se reseted. */ cfsetispeed(tp, ispeed); cfsetospeed(tp, ospeed); if (op->flags & F_LOCAL) { tp->c_cflag |= CLOCAL; } #ifdef HAVE_STRUCT_TERMIOS_C_LINE tp->c_line = 0; #endif tp->c_cc[VMIN] = 1; tp->c_cc[VTIME] = 0; /* Optionally enable hardware flow control */ #ifdef CRTSCTS if (op->flags & F_RTSCTS) tp->c_cflag |= CRTSCTS; #endif (void) tcsetattr(0, TCSANOW, tp); /* go to blocking input even in local mode */ fcntl(0, F_SETFL, fcntl(0, F_GETFL, 0) & ~O_NONBLOCK); debug("term_io 2\n"); } /* auto_baud - extract baud rate from modem status message */ void auto_baud(tp) struct termios *tp; { int speed; int vmin; unsigned iflag; char buf[BUFSIZ]; char *bp; int nread; /* * This works only if the modem produces its status code AFTER raising * the DCD line, and if the computer is fast enough to set the proper * baud rate before the message has gone by. We expect a message of the * following format: * * * * The number is interpreted as the baud rate of the incoming call. If the * modem does not tell us the baud rate within one second, we will keep * using the current baud rate. It is advisable to enable BREAK * processing (comma-separated list of baud rates) if the processing of * modem status messages is enabled. */ /* * Use 7-bit characters, don't block if input queue is empty. Errors will * be dealt with lateron. */ iflag = tp->c_iflag; tp->c_iflag |= ISTRIP; /* enable 8th-bit stripping */ vmin = tp->c_cc[VMIN]; tp->c_cc[VMIN] = 0; /* don't block if queue empty */ tcsetattr(0, TCSANOW, tp); /* * Wait for a while, then read everything the modem has said so far and * try to extract the speed of the dial-in call. */ (void) sleep(1); if ((nread = read(0, buf, sizeof(buf) - 1)) > 0) { buf[nread] = '\0'; for (bp = buf; bp < buf + nread; bp++) { if (isascii(*bp) && isdigit(*bp)) { if ((speed = bcode(bp))) { cfsetispeed(tp, speed); cfsetospeed(tp, speed); } break; } } } /* Restore terminal settings. Errors will be dealt with lateron. */ tp->c_iflag = iflag; tp->c_cc[VMIN] = vmin; (void) tcsetattr(0, TCSANOW, tp); } /* do_prompt - show login prompt, optionally preceded by /etc/issue contents */ void do_prompt(op, tp) struct options *op; struct termios *tp; { #ifdef ISSUE FILE *fd; int oflag; int c; struct utsname uts; (void) uname(&uts); #endif ignore_result( write(1, "\r\n", 2) ); /* start a new line */ #ifdef ISSUE /* optional: show /etc/issue */ if ((op->flags & F_ISSUE) && (fd = fopen(op->issue, "r"))) { oflag = tp->c_oflag; /* save current setting */ tp->c_oflag |= (ONLCR | OPOST); /* map NL in output to CR-NL */ (void) tcsetattr(0, TCSADRAIN, tp); while ((c = getc(fd)) != EOF) { if (c == '\\') { c = getc(fd); switch (c) { case 's': (void) printf ("%s", uts.sysname); break; case 'n': (void) printf ("%s", uts.nodename); break; case 'r': (void) printf ("%s", uts.release); break; case 'v': (void) printf ("%s", uts.version); break; case 'm': (void) printf ("%s", uts.machine); break; case 'o': { char domainname[MAXHOSTNAMELEN+1]; #ifdef HAVE_GETDOMAINNAME if (getdomainname(domainname, sizeof(domainname))) #endif strcpy(domainname, "unknown_domain"); domainname[sizeof(domainname)-1] = '\0'; printf ("%s", domainname); } break; case 'O': { char *dom = "unknown_domain"; char host[MAXHOSTNAMELEN+1]; struct addrinfo hints, *info = NULL; memset(&hints, 0, sizeof(hints)); hints.ai_flags = AI_CANONNAME; if (gethostname(host, sizeof(host)) || getaddrinfo(host, NULL, &hints, &info) || info == NULL) fputs(dom, stdout); else { char *canon; if (info->ai_canonname && (canon = strchr(info->ai_canonname, '.'))) dom = canon + 1; fputs(dom, stdout); freeaddrinfo(info); } } break; case 'd': case 't': { time_t now; struct tm *tm; (void) time (&now); tm = localtime(&now); if (c == 'd') (void) printf ("%s %s %d %d", nl_langinfo(ABDAY_1 + tm->tm_wday), nl_langinfo(ABMON_1 + tm->tm_mon), tm->tm_mday, tm->tm_year < 70 ? tm->tm_year + 2000 : tm->tm_year + 1900); else (void) printf ("%02d:%02d:%02d", tm->tm_hour, tm->tm_min, tm->tm_sec); break; } case 'l': (void) printf ("%s", op->tty); break; case 'b': { int i; for (i = 0; speedtab[i].speed; i++) { if (speedtab[i].code == cfgetispeed(tp)) { printf("%ld", speedtab[i].speed); break; } } break; } case 'u': case 'U': { int users = 0; struct utmp *ut; setutent(); while ((ut = getutent())) if (ut->ut_type == USER_PROCESS) users++; endutent(); printf ("%d ", users); if (c == 'U') printf ((users == 1) ? _("user") : _("users")); break; } default: (void) putchar(c); } } else (void) putchar(c); } fflush(stdout); tp->c_oflag = oflag; /* restore settings */ (void) tcsetattr(0, TCSADRAIN, tp); /* wait till output is gone */ (void) fclose(fd); } #endif { char hn[MAXHOSTNAMELEN+1]; if (gethostname(hn, sizeof(hn)) == 0) ignore_result( write(1, hn, strlen(hn)) ); } ignore_result( write(1, LOGIN, sizeof(LOGIN) - 1) ); /* always show login prompt */ } /* next_speed - select next baud rate */ void next_speed(tp, op) struct termios *tp; struct options *op; { static int baud_index = -1; if (baud_index == -1) /* * if the F_KEEPSPEED flags is set then the FIRST_SPEED is not * tested yet (see termio_init()). */ baud_index = (op->flags & F_KEEPSPEED) ? FIRST_SPEED : 1 % op->numspeed; else baud_index = (baud_index + 1) % op->numspeed; cfsetispeed(tp, op->speeds[baud_index]); cfsetospeed(tp, op->speeds[baud_index]); (void) tcsetattr(0, TCSANOW, tp); } /* get_logname - get user name, establish parity, speed, erase, kill, eol */ char *get_logname(op, cp, tp) struct options *op; struct chardata *cp; struct termios *tp; { static char logname[BUFSIZ]; char *bp; char c; /* input character, full eight bits */ char ascval; /* low 7 bits of input character */ int bits; /* # of "1" bits per character */ int mask; /* mask with 1 bit up */ static char *erase[] = { /* backspace-space-backspace */ "\010\040\010", /* space parity */ "\010\040\010", /* odd parity */ "\210\240\210", /* even parity */ "\210\240\210", /* no parity */ }; /* Initialize kill, erase, parity etc. (also after switching speeds). */ *cp = init_chardata; /* Flush pending input (esp. after parsing or switching the baud rate). */ (void) sleep(1); (void) tcflush(0, TCIFLUSH); /* Prompt for and read a login name. */ for (*logname = 0; *logname == 0; /* void */ ) { /* Write issue file and prompt, with "parity" bit == 0. */ do_prompt(op, tp); /* Read name, watch for break, parity, erase, kill, end-of-line. */ for (bp = logname, cp->eol = 0; cp->eol == 0; /* void */ ) { /* Do not report trivial EINTR/EIO errors. */ if (read(0, &c, 1) < 1) { if (errno == EINTR || errno == EIO) exit(EXIT_SUCCESS); error(_("%s: read: %m"), op->tty); } /* Do BREAK handling elsewhere. */ if ((c == 0) && op->numspeed > 1) return EXIT_SUCCESS; /* Do parity bit handling. */ if (op->eightbits) { ascval = c; } else if (c != (ascval = (c & 0177))) { /* "parity" bit on */ for (bits = 1, mask = 1; mask & 0177; mask <<= 1) if (mask & ascval) bits++; /* count "1" bits */ cp->parity |= ((bits & 1) ? 1 : 2); } /* Do erase, kill and end-of-line processing. */ switch (ascval) { case CR: case NL: *bp = 0; /* terminate logname */ cp->eol = ascval; /* set end-of-line char */ break; case BS: case DEL: case '#': cp->erase = ascval; /* set erase character */ if (bp > logname) { ignore_result( write(1, erase[cp->parity], 3) ); bp--; } break; case CTL('U'): case '@': cp->kill = ascval; /* set kill character */ while (bp > logname) { ignore_result( write(1, erase[cp->parity], 3) ); bp--; } break; case CTL('D'): exit(EXIT_SUCCESS); default: if (!isascii(ascval) || !isprint(ascval)) { /* ignore garbage characters */ ; } else if (bp - logname >= sizeof(logname) - 1) { error(_("%s: input overrun"), op->tty); } else { ignore_result( write(1, &c, 1) ); /* echo the character */ *bp++ = ascval; /* and store it */ } break; } } } /* Handle names with upper case and no lower case. */ if ((op->flags & F_LCUC) && (cp->capslock = caps_lock(logname))) { for (bp = logname; *bp; bp++) if (isupper(*bp)) *bp = tolower(*bp); /* map name to lower case */ } return logname; } /* termio_final - set the final tty mode bits */ void termio_final(op, tp, cp) struct options *op; struct termios *tp; struct chardata *cp; { /* General terminal-independent stuff. */ tp->c_iflag |= IXON | IXOFF; /* 2-way flow control */ tp->c_lflag |= ICANON | ISIG | ECHO | ECHOE | ECHOK| ECHOKE; /* no longer| ECHOCTL | ECHOPRT*/ tp->c_oflag |= OPOST; /* tp->c_cflag = 0; */ tp->c_cc[VINTR] = DEF_INTR; /* default interrupt */ tp->c_cc[VQUIT] = DEF_QUIT; /* default quit */ tp->c_cc[VEOF] = DEF_EOF; /* default EOF character */ tp->c_cc[VEOL] = DEF_EOL; #ifdef __linux__ tp->c_cc[VSWTC] = DEF_SWITCH; /* default switch character */ #elif defined(VSWTCH) tp->c_cc[VSWTCH] = DEF_SWITCH; /* default switch character */ #endif /* Account for special characters seen in input. */ if (cp->eol == CR) { tp->c_iflag |= ICRNL; /* map CR in input to NL */ tp->c_oflag |= ONLCR; /* map NL in output to CR-NL */ } tp->c_cc[VERASE] = cp->erase; /* set erase character */ tp->c_cc[VKILL] = cp->kill; /* set kill character */ /* Account for the presence or absence of parity bits in input. */ switch (cp->parity) { case 0: /* space (always 0) parity */ break; case 1: /* odd parity */ tp->c_cflag |= PARODD; /* FALLTHROUGH */ case 2: /* even parity */ tp->c_cflag |= PARENB; tp->c_iflag |= INPCK | ISTRIP; /* FALLTHROUGH */ case (1 | 2): /* no parity bit */ tp->c_cflag &= ~CSIZE; tp->c_cflag |= CS7; break; } /* Account for upper case without lower case. */ if (cp->capslock) { #ifdef IUCLC tp->c_iflag |= IUCLC; #endif #ifdef XCASE tp->c_lflag |= XCASE; #endif #ifdef OLCUC tp->c_oflag |= OLCUC; #endif } /* Optionally enable hardware flow control */ #ifdef CRTSCTS if (op->flags & F_RTSCTS) tp->c_cflag |= CRTSCTS; #endif /* Finally, make the new settings effective */ if (tcsetattr(0, TCSANOW, tp) < 0) error("%s: tcsetattr: TCSANOW: %m", op->tty); } /* caps_lock - string contains upper case without lower case */ int caps_lock(s) char *s; { int capslock; for (capslock = 0; *s; s++) { if (islower(*s)) return EXIT_SUCCESS; if (capslock == 0) capslock = isupper(*s); } return capslock; } /* bcode - convert speed string to speed code; return 0 on failure */ int bcode(s) char *s; { struct Speedtab *sp; long speed = atol(s); for (sp = speedtab; sp->speed; sp++) if (sp->speed == speed) return sp->code; return 0; } /* usage - explain */ void __attribute__((__noreturn__)) usage(void) { fprintf(stderr, _("Usage: %s [-8hiLmsUw] [-l login_program] [-t timeout] [-I initstring] [-H login_host] baud_rate,... line [termtype]\nor\t[-hiLmw] [-l login_program] [-t timeout] [-I initstring] [-H login_host] line baud_rate,... [termtype]\n"), progname); exit(EXIT_FAILURE); } /* error - report errors to console or syslog; only understands %s and %m */ #define str2cpy(b,s1,s2) strcat(strcpy(b,s1),s2) void error(const char *fmt, ...) { va_list ap; #ifndef USE_SYSLOG int fd; #endif char buf[BUFSIZ]; char *bp; /* * If the diagnostic is reported via syslog(3), the process name is * automatically prepended to the message. If we write directly to * /dev/console, we must prepend the process name ourselves. */ #ifdef USE_SYSLOG buf[0] = '\0'; bp = buf; #else (void) str2cpy(buf, progname, ": "); bp = buf + strlen(buf); #endif /* * %s expansion is done by hand. On a System V Release 2 system without * shared libraries and without syslog(3), linking with the the stdio * library would make the program three times as big... * * %m expansion is done here as well. Too bad syslog(3) does not have a * vsprintf() like interface. */ va_start(ap, fmt); while (*fmt && bp < &buf[BUFSIZ-1]) { if (strncmp(fmt, "%s", 2) == 0) { xstrncpy(bp, va_arg(ap, char *), &buf[BUFSIZ-1] - bp); bp += strlen(bp); fmt += 2; } else if (strncmp(fmt, "%m", 2) == 0) { xstrncpy(bp, strerror(errno), &buf[BUFSIZ-1] - bp); bp += strlen(bp); fmt += 2; } else { *bp++ = *fmt++; } } *bp = 0; va_end(ap); /* * Write the diagnostic directly to /dev/console if we do not use the * syslog(3) facility. */ #ifdef USE_SYSLOG (void) openlog(progname, LOG_PID, LOG_AUTHPRIV); (void) syslog(LOG_ERR, "%s", buf); closelog(); #else /* Terminate with CR-LF since the console mode is unknown. */ (void) strcat(bp, "\r\n"); if ((fd = open("/dev/console", 1)) >= 0) { ignore_result( write(fd, buf, strlen(buf)) ); (void) close(fd); } #endif (void) sleep((unsigned) 10); /* be kind to init(8) */ exit(1); }