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-rw-r--r--libexec/getty/subr.c676
1 files changed, 676 insertions, 0 deletions
diff --git a/libexec/getty/subr.c b/libexec/getty/subr.c
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+++ b/libexec/getty/subr.c
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+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 1983, 1993
+ * 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.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+ */
+
+/*
+ * Melbourne getty.
+ */
+#include <sys/ioctl.h>
+#include <sys/param.h>
+#include <sys/time.h>
+
+#include <poll.h>
+#include <regex.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syslog.h>
+#include <termios.h>
+#include <unistd.h>
+
+#include "gettytab.h"
+#include "pathnames.h"
+#include "extern.h"
+
+/*
+ * Get a table entry.
+ */
+void
+gettable(const char *name)
+{
+ char *buf = NULL;
+ struct gettystrs *sp;
+ struct gettynums *np;
+ struct gettyflags *fp;
+ long n;
+ int l;
+ char *p;
+ static char path_gettytab[PATH_MAX];
+ char *dba[2];
+
+ static int firsttime = 1;
+
+ strlcpy(path_gettytab, _PATH_GETTYTAB, sizeof(path_gettytab));
+ dba[0] = path_gettytab;
+ dba[1] = NULL;
+
+ if (firsttime) {
+ /*
+ * we need to strdup() anything in the strings array
+ * initially in order to simplify things later
+ */
+ for (sp = gettystrs; sp->field; sp++)
+ if (sp->value != NULL) {
+ /* handle these ones more carefully */
+ if (sp >= &gettystrs[4] && sp <= &gettystrs[6])
+ l = 2;
+ else
+ l = strlen(sp->value) + 1;
+ if ((p = malloc(l)) != NULL)
+ strlcpy(p, sp->value, l);
+ /*
+ * replace, even if NULL, else we'll
+ * have problems with free()ing static mem
+ */
+ sp->value = p;
+ }
+ firsttime = 0;
+ }
+
+ switch (cgetent(&buf, dba, name)) {
+ case 1:
+ syslog(LOG_ERR, "getty: couldn't resolve 'tc=' in gettytab '%s'", name);
+ return;
+ case 0:
+ break;
+ case -1:
+ syslog(LOG_ERR, "getty: unknown gettytab entry '%s'", name);
+ return;
+ case -2:
+ syslog(LOG_ERR, "getty: retrieving gettytab entry '%s': %m", name);
+ return;
+ case -3:
+ syslog(LOG_ERR, "getty: recursive 'tc=' reference gettytab entry '%s'", name);
+ return;
+ default:
+ syslog(LOG_ERR, "getty: unexpected cgetent() error for entry '%s'", name);
+ return;
+ }
+
+ for (sp = gettystrs; sp->field; sp++) {
+ if ((l = cgetstr(buf, sp->field, &p)) >= 0) {
+ if (sp->value) {
+ /* prefer existing value */
+ if (strcmp(p, sp->value) != 0)
+ free(sp->value);
+ else {
+ free(p);
+ p = sp->value;
+ }
+ }
+ sp->value = p;
+ } else if (l == -1) {
+ free(sp->value);
+ sp->value = NULL;
+ }
+ }
+
+ for (np = gettynums; np->field; np++) {
+ if (cgetnum(buf, np->field, &n) == -1)
+ np->set = 0;
+ else {
+ np->set = 1;
+ np->value = n;
+ }
+ }
+
+ for (fp = gettyflags; fp->field; fp++) {
+ if (cgetcap(buf, fp->field, ':') == NULL)
+ fp->set = 0;
+ else {
+ fp->set = 1;
+ fp->value = 1 ^ fp->invrt;
+ }
+ }
+ free(buf);
+}
+
+void
+gendefaults(void)
+{
+ struct gettystrs *sp;
+ struct gettynums *np;
+ struct gettyflags *fp;
+
+ for (sp = gettystrs; sp->field; sp++)
+ if (sp->value)
+ sp->defalt = strdup(sp->value);
+ for (np = gettynums; np->field; np++)
+ if (np->set)
+ np->defalt = np->value;
+ for (fp = gettyflags; fp->field; fp++)
+ if (fp->set)
+ fp->defalt = fp->value;
+ else
+ fp->defalt = fp->invrt;
+}
+
+void
+setdefaults(void)
+{
+ struct gettystrs *sp;
+ struct gettynums *np;
+ struct gettyflags *fp;
+
+ for (sp = gettystrs; sp->field; sp++)
+ if (!sp->value)
+ sp->value = !sp->defalt ?
+ sp->defalt : strdup(sp->defalt);
+ for (np = gettynums; np->field; np++)
+ if (!np->set)
+ np->value = np->defalt;
+ for (fp = gettyflags; fp->field; fp++)
+ if (!fp->set)
+ fp->value = fp->defalt;
+}
+
+static char **
+charnames[] = {
+ &ER, &KL, &IN, &QU, &XN, &XF, &ET, &BK,
+ &SU, &DS, &RP, &FL, &WE, &LN, 0
+};
+
+#define CV(a) (char *)(&tmode.c_cc[a])
+
+static char *
+charvars[] = {
+ CV(VERASE), CV(VKILL), CV(VINTR),
+ CV(VQUIT), CV(VSTART), CV(VSTOP),
+ CV(VEOF), CV(VEOL), CV(VSUSP),
+ CV(VDSUSP), CV(VREPRINT), CV(VDISCARD),
+ CV(VWERASE), CV(VLNEXT), 0
+};
+
+void
+setchars(void)
+{
+ int i;
+ const char *p;
+
+ for (i = 0; charnames[i]; i++) {
+ p = *charnames[i];
+ if (p && *p)
+ *charvars[i] = *p;
+ else
+ *charvars[i] = _POSIX_VDISABLE;
+ }
+}
+
+/* Macros to clear/set/test flags. */
+#define SET(t, f) (t) |= (f)
+#define CLR(t, f) (t) &= ~(f)
+#define ISSET(t, f) ((t) & (f))
+
+void
+set_flags(int n)
+{
+ tcflag_t iflag, oflag, cflag, lflag;
+
+
+ switch (n) {
+ case 0:
+ if (C0set && I0set && L0set && O0set) {
+ tmode.c_cflag = C0;
+ tmode.c_iflag = I0;
+ tmode.c_lflag = L0;
+ tmode.c_oflag = O0;
+ return;
+ }
+ break;
+ case 1:
+ if (C1set && I1set && L1set && O1set) {
+ tmode.c_cflag = C1;
+ tmode.c_iflag = I1;
+ tmode.c_lflag = L1;
+ tmode.c_oflag = O1;
+ return;
+ }
+ break;
+ default:
+ if (C2set && I2set && L2set && O2set) {
+ tmode.c_cflag = C2;
+ tmode.c_iflag = I2;
+ tmode.c_lflag = L2;
+ tmode.c_oflag = O2;
+ return;
+ }
+ break;
+ }
+
+ iflag = omode.c_iflag;
+ oflag = omode.c_oflag;
+ cflag = omode.c_cflag;
+ lflag = omode.c_lflag;
+
+ if (NP) {
+ CLR(cflag, CSIZE|PARENB);
+ SET(cflag, CS8);
+ CLR(iflag, ISTRIP|INPCK|IGNPAR);
+ } else if (AP || EP || OP) {
+ CLR(cflag, CSIZE);
+ SET(cflag, CS7|PARENB);
+ SET(iflag, ISTRIP);
+ if (OP && !EP) {
+ SET(iflag, INPCK|IGNPAR);
+ SET(cflag, PARODD);
+ if (AP)
+ CLR(iflag, INPCK);
+ } else if (EP && !OP) {
+ SET(iflag, INPCK|IGNPAR);
+ CLR(cflag, PARODD);
+ if (AP)
+ CLR(iflag, INPCK);
+ } else if (AP || (EP && OP)) {
+ CLR(iflag, INPCK|IGNPAR);
+ CLR(cflag, PARODD);
+ }
+ } /* else, leave as is */
+
+#if 0
+ if (UC)
+ f |= LCASE;
+#endif
+
+ if (HC)
+ SET(cflag, HUPCL);
+ else
+ CLR(cflag, HUPCL);
+
+ if (MB)
+ SET(cflag, MDMBUF);
+ else
+ CLR(cflag, MDMBUF);
+
+ if (HW)
+ SET(cflag, CRTSCTS);
+ else
+ CLR(cflag, CRTSCTS);
+
+ if (NL) {
+ SET(iflag, ICRNL);
+ SET(oflag, ONLCR|OPOST);
+ } else {
+ CLR(iflag, ICRNL);
+ CLR(oflag, ONLCR);
+ }
+
+ if (!HT)
+ SET(oflag, OXTABS|OPOST);
+ else
+ CLR(oflag, OXTABS);
+
+#ifdef XXX_DELAY
+ SET(f, delaybits());
+#endif
+
+ if (n == 1) { /* read mode flags */
+ if (RW) {
+ iflag = 0;
+ CLR(oflag, OPOST);
+ CLR(cflag, CSIZE|PARENB);
+ SET(cflag, CS8);
+ lflag = 0;
+ } else {
+ CLR(lflag, ICANON);
+ }
+ goto out;
+ }
+
+ if (n == 0)
+ goto out;
+
+#if 0
+ if (CB)
+ SET(f, CRTBS);
+#endif
+
+ if (CE)
+ SET(lflag, ECHOE);
+ else
+ CLR(lflag, ECHOE);
+
+ if (CK)
+ SET(lflag, ECHOKE);
+ else
+ CLR(lflag, ECHOKE);
+
+ if (PE)
+ SET(lflag, ECHOPRT);
+ else
+ CLR(lflag, ECHOPRT);
+
+ if (EC)
+ SET(lflag, ECHO);
+ else
+ CLR(lflag, ECHO);
+
+ if (XC)
+ SET(lflag, ECHOCTL);
+ else
+ CLR(lflag, ECHOCTL);
+
+ if (DX)
+ SET(lflag, IXANY);
+ else
+ CLR(lflag, IXANY);
+
+out:
+ tmode.c_iflag = iflag;
+ tmode.c_oflag = oflag;
+ tmode.c_cflag = cflag;
+ tmode.c_lflag = lflag;
+}
+
+
+#ifdef XXX_DELAY
+struct delayval {
+ unsigned delay; /* delay in ms */
+ int bits;
+};
+
+/*
+ * below are random guesses, I can't be bothered checking
+ */
+
+struct delayval crdelay[] = {
+ { 1, CR1 },
+ { 2, CR2 },
+ { 3, CR3 },
+ { 83, CR1 },
+ { 166, CR2 },
+ { 0, CR3 },
+};
+
+struct delayval nldelay[] = {
+ { 1, NL1 }, /* special, calculated */
+ { 2, NL2 },
+ { 3, NL3 },
+ { 100, NL2 },
+ { 0, NL3 },
+};
+
+struct delayval bsdelay[] = {
+ { 1, BS1 },
+ { 0, 0 },
+};
+
+struct delayval ffdelay[] = {
+ { 1, FF1 },
+ { 1750, FF1 },
+ { 0, FF1 },
+};
+
+struct delayval tbdelay[] = {
+ { 1, TAB1 },
+ { 2, TAB2 },
+ { 3, XTABS }, /* this is expand tabs */
+ { 100, TAB1 },
+ { 0, TAB2 },
+};
+
+int
+delaybits(void)
+{
+ int f;
+
+ f = adelay(CD, crdelay);
+ f |= adelay(ND, nldelay);
+ f |= adelay(FD, ffdelay);
+ f |= adelay(TD, tbdelay);
+ f |= adelay(BD, bsdelay);
+ return (f);
+}
+
+int
+adelay(int ms, struct delayval *dp)
+{
+ if (ms == 0)
+ return (0);
+ while (dp->delay && ms > dp->delay)
+ dp++;
+ return (dp->bits);
+}
+#endif
+
+char editedhost[MAXHOSTNAMELEN];
+
+void
+edithost(const char *pattern)
+{
+ regex_t regex;
+ regmatch_t *match;
+ int found;
+
+ if (pattern == NULL || *pattern == '\0')
+ goto copyasis;
+ if (regcomp(&regex, pattern, REG_EXTENDED) != 0)
+ goto copyasis;
+
+ match = calloc(regex.re_nsub + 1, sizeof(*match));
+ if (match == NULL) {
+ regfree(&regex);
+ goto copyasis;
+ }
+
+ found = !regexec(&regex, HN, regex.re_nsub + 1, match, 0);
+ if (found) {
+ size_t subex, totalsize;
+
+ /*
+ * We found a match. If there were no parenthesized
+ * subexpressions in the pattern, use entire matched
+ * string as ``editedhost''; otherwise use the first
+ * matched subexpression.
+ */
+ subex = !!regex.re_nsub;
+ totalsize = match[subex].rm_eo - match[subex].rm_so + 1;
+ strlcpy(editedhost, HN + match[subex].rm_so, totalsize >
+ sizeof(editedhost) ? sizeof(editedhost) : totalsize);
+ }
+ free(match);
+ regfree(&regex);
+ if (found)
+ return;
+ /*
+ * In case of any errors, or if the pattern did not match, pass
+ * the original hostname as is.
+ */
+copyasis:
+ strlcpy(editedhost, HN, sizeof(editedhost));
+}
+
+static struct speedtab {
+ int speed;
+ int uxname;
+} 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 },
+ { 19200, EXTA },
+ { 19, EXTA }, /* for people who say 19.2K */
+ { 38400, EXTB },
+ { 38, EXTB },
+ { 7200, EXTB }, /* alternative */
+ { 57600, B57600 },
+ { 115200, B115200 },
+ { 230400, B230400 },
+ { 0, 0 }
+};
+
+int
+speed(int val)
+{
+ struct speedtab *sp;
+
+ if (val <= B230400)
+ return (val);
+
+ for (sp = speedtab; sp->speed; sp++)
+ if (sp->speed == val)
+ return (sp->uxname);
+
+ return (B300); /* default in impossible cases */
+}
+
+void
+makeenv(char *env[])
+{
+ static char termbuf[128] = "TERM=";
+ char *p, *q;
+ char **ep;
+
+ ep = env;
+ if (TT && *TT) {
+ strlcat(termbuf, TT, sizeof(termbuf));
+ *ep++ = termbuf;
+ }
+ if ((p = EV)) {
+ q = p;
+ while ((q = strchr(q, ','))) {
+ *q++ = '\0';
+ *ep++ = p;
+ p = q;
+ }
+ if (*p)
+ *ep++ = p;
+ }
+ *ep = (char *)0;
+}
+
+/*
+ * This speed select mechanism is written for the Develcon DATASWITCH.
+ * The Develcon sends a string of the form "B{speed}\n" at a predefined
+ * baud rate. This string indicates the user's actual speed.
+ * The routine below returns the terminal type mapped from derived speed.
+ */
+static struct portselect {
+ const char *ps_baud;
+ const char *ps_type;
+} portspeeds[] = {
+ { "B110", "std.110" },
+ { "B134", "std.134" },
+ { "B150", "std.150" },
+ { "B300", "std.300" },
+ { "B600", "std.600" },
+ { "B1200", "std.1200" },
+ { "B2400", "std.2400" },
+ { "B4800", "std.4800" },
+ { "B9600", "std.9600" },
+ { "B19200", "std.19200" },
+ { NULL, NULL }
+};
+
+const char *
+portselector(void)
+{
+ char c, baud[20];
+ const char *type = "default";
+ struct portselect *ps;
+ size_t len;
+
+ alarm(5*60);
+ for (len = 0; len < sizeof (baud) - 1; len++) {
+ if (read(STDIN_FILENO, &c, 1) <= 0)
+ break;
+ c &= 0177;
+ if (c == '\n' || c == '\r')
+ break;
+ if (c == 'B')
+ len = 0; /* in case of leading garbage */
+ baud[len] = c;
+ }
+ baud[len] = '\0';
+ for (ps = portspeeds; ps->ps_baud; ps++)
+ if (strcmp(ps->ps_baud, baud) == 0) {
+ type = ps->ps_type;
+ break;
+ }
+ sleep(2); /* wait for connection to complete */
+ return (type);
+}
+
+/*
+ * This auto-baud speed select mechanism is written for the Micom 600
+ * portselector. Selection is done by looking at how the character '\r'
+ * is garbled at the different speeds.
+ */
+const char *
+autobaud(void)
+{
+ struct pollfd set[1];
+ struct timespec timeout;
+ char c;
+ const char *type = "9600-baud";
+
+ (void)tcflush(0, TCIOFLUSH);
+ set[0].fd = STDIN_FILENO;
+ set[0].events = POLLIN;
+ if (poll(set, 1, 5000) <= 0)
+ return (type);
+ if (read(STDIN_FILENO, &c, sizeof(char)) != sizeof(char))
+ return (type);
+ timeout.tv_sec = 0;
+ timeout.tv_nsec = 20000;
+ (void)nanosleep(&timeout, NULL);
+ (void)tcflush(0, TCIOFLUSH);
+ switch (c & 0377) {
+
+ case 0200: /* 300-baud */
+ type = "300-baud";
+ break;
+
+ case 0346: /* 1200-baud */
+ type = "1200-baud";
+ break;
+
+ case 015: /* 2400-baud */
+ case 0215:
+ type = "2400-baud";
+ break;
+
+ default: /* 4800-baud */
+ type = "4800-baud";
+ break;
+
+ case 0377: /* 9600-baud */
+ type = "9600-baud";
+ break;
+ }
+ return (type);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-11-08 05:53:56 +0000