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freebsd-skq/usr.sbin/dconschat/dconschat.c
Warner Losh 8ef97d2ba3 dconschat: Remove support for FreeBSD 4.x and earlier. 
Sponsored by:		Netflix
2021-04-20 15:51:31 -06:00

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/*-
* SPDX-License-Identifier: BSD-4-Clause
*
* Copyright (C) 2003
* Hidetoshi Shimokawa. 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
*
* This product includes software developed by Hidetoshi Shimokawa.
*
* 4. Neither the name of the author 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.
*
* $Id: dconschat.c,v 1.76 2003/10/23 06:21:13 simokawa Exp $
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <sys/wait.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <termios.h>
#include <dev/dcons/dcons.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <err.h>
#include <string.h>
#include <sys/eui64.h>
#include <sys/event.h>
#include <sys/time.h>
#include <arpa/telnet.h>
#include <sys/ioccom.h>
#include <dev/firewire/firewire.h>
#include <dev/firewire/iec13213.h>
#include <kvm.h>
#include <nlist.h>
#include <sys/errno.h>
#define DCONS_POLL_HZ 100
#define DCONS_POLL_OFFLINE 2 /* sec */
#define RETRY 3
#ifdef CSRVAL_VENDOR_PRIVATE
#define USE_CROM 1
#else
#define USE_CROM 0
#endif
int verbose = 0;
int tc_set = 0;
int poll_hz = DCONS_POLL_HZ;
static u_char abreak[3] = {13 /* CR */, 126 /* ~ */, 2 /* ^B */};
#define IS_CONSOLE(p) ((p)->port == DCONS_CON)
#define IS_GDB(p) ((p)->port == DCONS_GDB)
static struct dcons_state {
int fd;
kvm_t *kd;
int kq;
off_t paddr;
off_t reset;
#define F_READY (1 << 1)
#define F_RD_ONLY (1 << 2)
#define F_ALT_BREAK (1 << 3)
#define F_TELNET (1 << 4)
#define F_USE_CROM (1 << 5)
#define F_ONE_SHOT (1 << 6)
#define F_REPLAY (1 << 7)
int flags;
enum {
TYPE_KVM,
TYPE_FW
} type;
int escape_state;
struct dcons_port {
int port;
int sport;
struct dcons_ch o;
struct dcons_ch i;
u_int32_t optr;
u_int32_t iptr;
int s;
int infd;
int outfd;
struct addrinfo *res;
int skip_read;
} port[DCONS_NPORT];
struct timespec to;
struct timespec zero;
struct termios tsave;
struct termios traw;
char escape;
} sc;
static int dconschat_write_dcons(struct dcons_state *, int, char *, int);
static int
dread(struct dcons_state *dc, void *buf, size_t n, off_t offset)
{
switch (dc->type) {
case TYPE_FW:
return (pread(dc->fd, buf, n, offset));
case TYPE_KVM:
return (kvm_read(dc->kd, offset, buf, n));
}
return (-1);
}
static int
dwrite(struct dcons_state *dc, void *buf, size_t n, off_t offset)
{
if ((dc->flags & F_RD_ONLY) != 0)
return (n);
switch (dc->type) {
case TYPE_FW:
return (pwrite(dc->fd, buf, n, offset));
case TYPE_KVM:
return (kvm_write(dc->kd, offset, buf, n));
}
return (-1);
}
static void
dconschat_reset_target(struct dcons_state *dc, struct dcons_port *p)
{
char buf[PAGE_SIZE];
if (dc->reset == 0)
return;
snprintf(buf, PAGE_SIZE,
"\r\n[dconschat reset target(addr=0x%jx)...]\r\n",
(intmax_t)dc->reset);
write(p->outfd, buf, strlen(buf));
bzero(&buf[0], PAGE_SIZE);
dwrite(dc, (void *)buf, PAGE_SIZE, dc->reset);
}
static void
dconschat_suspend(struct dcons_state *dc, struct dcons_port *p)
{
if (p->sport != 0)
return;
if (tc_set)
tcsetattr(STDIN_FILENO, TCSADRAIN, &dc->tsave);
printf("\n[dconschat suspend]\n");
kill(getpid(), SIGTSTP);
if (tc_set)
tcsetattr(STDIN_FILENO, TCSADRAIN, &dc->traw);
}
static void
dconschat_sigchld(int s)
{
struct kevent kev;
struct dcons_port *p;
char buf[256];
p = &sc.port[DCONS_CON];
snprintf(buf, 256, "\r\n[child exit]\r\n");
write(p->outfd, buf, strlen(buf));
if (tc_set)
tcsetattr(STDIN_FILENO, TCSADRAIN, &sc.traw);
EV_SET(&kev, p->infd, EVFILT_READ, EV_ADD, NOTE_LOWAT, 1, (void *)p);
kevent(sc.kq, &kev, 1, NULL, 0, &sc.zero);
}
static void
dconschat_fork_gdb(struct dcons_state *dc, struct dcons_port *p)
{
pid_t pid;
char buf[256], com[256];
struct kevent kev;
pid = fork();
if (pid < 0) {
snprintf(buf, 256, "\r\n[%s: fork failed]\r\n", __FUNCTION__);
write(p->outfd, buf, strlen(buf));
}
if (pid == 0) {
/* child */
if (tc_set)
tcsetattr(STDIN_FILENO, TCSADRAIN, &dc->tsave);
snprintf(com, sizeof(buf), "kgdb -r :%d kernel",
dc->port[DCONS_GDB].sport);
snprintf(buf, 256, "\n[fork %s]\n", com);
write(p->outfd, buf, strlen(buf));
execl("/bin/sh", "/bin/sh", "-c", com, NULL);
snprintf(buf, 256, "\n[fork failed]\n");
write(p->outfd, buf, strlen(buf));
if (tc_set)
tcsetattr(STDIN_FILENO, TCSADRAIN, &dc->traw);
exit(0);
} else {
signal(SIGCHLD, dconschat_sigchld);
EV_SET(&kev, p->infd, EVFILT_READ, EV_DELETE, 0, 0, NULL);
kevent(sc.kq, &kev, 1, NULL, 0, &sc.zero);
}
}
static void
dconschat_cleanup(int sig)
{
struct dcons_state *dc;
int status;
dc = &sc;
if (tc_set != 0)
tcsetattr(STDIN_FILENO, TCSADRAIN, &dc->tsave);
if (sig > 0)
printf("\n[dconschat exiting with signal %d ...]\n", sig);
else
printf("\n[dconschat exiting...]\n");
wait(&status);
exit(0);
}
#if USE_CROM
static int
dconschat_get_crom(struct dcons_state *dc)
{
off_t addr;
int i, state = 0;
u_int32_t buf, hi = 0, lo = 0, reset_hi = 0, reset_lo = 0;
struct csrreg *reg;
reg = (struct csrreg *)&buf;
addr = 0xffff;
addr = (addr << 32) | 0xf0000400;
for (i = 20; i < 0x400; i += 4) {
if (dread(dc, &buf, 4, addr + i) < 0) {
if (verbose)
warn("crom read faild");
goto out;
}
buf = ntohl(buf);
if (verbose)
printf("%d %02x %06x\n", state, reg->key, reg->val);
switch (state) {
case 0:
if (reg->key == CSRKEY_SPEC &&
reg->val == CSRVAL_VENDOR_PRIVATE)
state = 1;
break;
case 1:
if (reg->key == CSRKEY_VER &&
reg->val == DCONS_CSR_VAL_VER)
state = 2;
break;
case 2:
switch (reg->key) {
case DCONS_CSR_KEY_HI:
hi = reg->val;
break;
case DCONS_CSR_KEY_LO:
lo = reg->val;
break;
case DCONS_CSR_KEY_RESET_HI:
reset_hi = reg->val;
break;
case DCONS_CSR_KEY_RESET_LO:
reset_lo = reg->val;
goto out;
break;
case 0x81:
break;
default:
state = 0;
}
break;
}
}
out:
if (verbose)
printf("addr: %06x %06x\n", hi, lo);
dc->paddr = ((off_t)hi << 24) | lo;
dc->reset = ((off_t)reset_hi << 24) | reset_lo;
if (dc->paddr == 0)
return (-1);
return (0);
}
#endif
static void
dconschat_ready(struct dcons_state *dc, int ready, char *reason)
{
static char oldreason[64] = "";
int old;
old = (dc->flags & F_READY) ? 1 : 0;
if (ready) {
dc->flags |= F_READY;
if (ready != old)
printf("[dcons connected]\r\n");
oldreason[0] = 0;
} else {
dc->flags &= ~F_READY;
if (strncmp(oldreason, reason, sizeof(oldreason)) != 0) {
printf("[dcons disconnected (%s)]\r\n", reason);
strlcpy(oldreason, reason, sizeof(oldreason));
}
}
}
static int
dconschat_fetch_header(struct dcons_state *dc)
{
char ebuf[64];
struct dcons_buf dbuf;
int j;
#if USE_CROM
if (dc->paddr == 0 && (dc->flags & F_USE_CROM) != 0) {
if (dconschat_get_crom(dc)) {
dconschat_ready(dc, 0, "get crom failed");
return (-1);
}
}
#endif
if (dread(dc, &dbuf, DCONS_HEADER_SIZE, dc->paddr) < 0) {
dconschat_ready(dc, 0, "read header failed");
return (-1);
}
if (dbuf.magic != htonl(DCONS_MAGIC)) {
if ((dc->flags & F_USE_CROM) !=0)
dc->paddr = 0;
snprintf(ebuf, sizeof(ebuf), "wrong magic 0x%08x", dbuf.magic);
dconschat_ready(dc, 0, ebuf);
return (-1);
}
if (ntohl(dbuf.version) != DCONS_VERSION) {
snprintf(ebuf, sizeof(ebuf),
"wrong version %d,%d",
ntohl(dbuf.version), DCONS_VERSION);
/* XXX exit? */
dconschat_ready(dc, 0, ebuf);
return (-1);
}
for (j = 0; j < DCONS_NPORT; j++) {
struct dcons_ch *o, *i;
off_t newbuf;
int new = 0;
o = &dc->port[j].o;
newbuf = dc->paddr + ntohl(dbuf.ooffset[j]);
o->size = ntohl(dbuf.osize[j]);
if (newbuf != o->buf) {
/* buffer address has changes */
new = 1;
o->gen = ntohl(dbuf.optr[j]) >> DCONS_GEN_SHIFT;
o->pos = ntohl(dbuf.optr[j]) & DCONS_POS_MASK;
o->buf = newbuf;
}
i = &dc->port[j].i;
i->size = ntohl(dbuf.isize[j]);
i->gen = ntohl(dbuf.iptr[j]) >> DCONS_GEN_SHIFT;
i->pos = ntohl(dbuf.iptr[j]) & DCONS_POS_MASK;
i->buf = dc->paddr + ntohl(dbuf.ioffset[j]);
if (verbose) {
printf("port %d size offset gen pos\n", j);
printf("output: %5d %6d %5d %5d\n"
"input : %5d %6d %5d %5d\n",
o->size, ntohl(dbuf.ooffset[j]), o->gen, o->pos,
i->size, ntohl(dbuf.ioffset[j]), i->gen, i->pos);
}
if (IS_CONSOLE(&dc->port[j]) && new &&
(dc->flags & F_REPLAY) !=0) {
if (o->gen > 0)
o->gen --;
else
o->pos = 0;
}
}
dconschat_ready(dc, 1, NULL);
return(0);
}
static int
dconschat_get_ptr (struct dcons_state *dc) {
int dlen, i;
u_int32_t ptr[DCONS_NPORT*2+1];
static int retry = RETRY;
char ebuf[64];
again:
dlen = dread(dc, &ptr, sizeof(ptr),
dc->paddr + __offsetof(struct dcons_buf, magic));
if (dlen < 0) {
if (errno == ETIMEDOUT)
if (retry -- > 0)
goto again;
dconschat_ready(dc, 0, "get ptr failed");
return(-1);
}
if (ptr[0] != htonl(DCONS_MAGIC)) {
if ((dc->flags & F_USE_CROM) !=0)
dc->paddr = 0;
snprintf(ebuf, sizeof(ebuf), "wrong magic 0x%08x", ptr[0]);
dconschat_ready(dc, 0, ebuf);
return(-1);
}
retry = RETRY;
for (i = 0; i < DCONS_NPORT; i ++) {
dc->port[i].optr = ntohl(ptr[i + 1]);
dc->port[i].iptr = ntohl(ptr[DCONS_NPORT + i + 1]);
}
return(0);
}
#define MAX_XFER 2048
static int
dconschat_read_dcons(struct dcons_state *dc, int port, char *buf, int len)
{
struct dcons_ch *ch;
u_int32_t ptr, pos, gen, next_gen;
int rlen, dlen, lost;
int retry = RETRY;
ch = &dc->port[port].o;
ptr = dc->port[port].optr;
gen = ptr >> DCONS_GEN_SHIFT;
pos = ptr & DCONS_POS_MASK;
if (gen == ch->gen && pos == ch->pos)
return (-1);
next_gen = DCONS_NEXT_GEN(ch->gen);
/* XXX sanity check */
if (gen == ch->gen) {
if (pos > ch->pos)
goto ok;
lost = ch->size * DCONS_GEN_MASK - ch->pos;
ch->pos = 0;
} else if (gen == next_gen) {
if (pos <= ch->pos)
goto ok;
lost = pos - ch->pos;
ch->pos = pos;
} else {
lost = gen - ch->gen;
if (lost < 0)
lost += DCONS_GEN_MASK;
if (verbose)
printf("[genskip %d]", lost);
lost = lost * ch->size - ch->pos;
ch->pos = 0;
ch->gen = gen;
}
/* generation skipped !! */
/* XXX discard */
if (verbose)
printf("[lost %d]", lost);
ok:
if (gen == ch->gen)
rlen = pos - ch->pos;
else
rlen = ch->size - ch->pos;
if (rlen > MAX_XFER)
rlen = MAX_XFER;
if (rlen > len)
rlen = len;
#if 1
if (verbose == 1)
printf("[%d]", rlen); fflush(stdout);
#endif
again:
dlen = dread(dc, buf, rlen, ch->buf + ch->pos);
if (dlen < 0) {
if (errno == ETIMEDOUT)
if (retry -- > 0)
goto again;
dconschat_ready(dc, 0, "read buffer failed");
return(-1);
}
if (dlen != rlen)
warnx("dlen(%d) != rlen(%d)\n", dlen, rlen);
ch->pos += dlen;
if (ch->pos >= ch->size) {
ch->gen = next_gen;
ch->pos = 0;
if (verbose)
printf("read_dcons: gen=%d", ch->gen);
}
return (dlen);
}
static int
dconschat_write_dcons(struct dcons_state *dc, int port, char *buf, int blen)
{
struct dcons_ch *ch;
u_int32_t ptr;
int len, wlen;
int retry = RETRY;
ch = &dc->port[port].i;
ptr = dc->port[port].iptr;
/* the others may advance the pointer sync with it */
ch->gen = ptr >> DCONS_GEN_SHIFT;
ch->pos = ptr & DCONS_POS_MASK;
while(blen > 0) {
wlen = MIN(blen, ch->size - ch->pos);
wlen = MIN(wlen, MAX_XFER);
len = dwrite(dc, buf, wlen, ch->buf + ch->pos);
if (len < 0) {
if (errno == ETIMEDOUT)
if (retry -- > 0)
continue; /* try again */
dconschat_ready(dc, 0, "write buffer failed");
return(-1);
}
ch->pos += len;
buf += len;
blen -= len;
if (ch->pos >= ch->size) {
ch->gen = DCONS_NEXT_GEN(ch->gen);
ch->pos = 0;
if (verbose)
printf("write_dcons: gen=%d", ch->gen);
}
}
ptr = DCONS_MAKE_PTR(ch);
dc->port[port].iptr = ptr;
if (verbose > 2)
printf("(iptr: 0x%x)", ptr);
again:
len = dwrite(dc, &ptr, sizeof(u_int32_t),
dc->paddr + __offsetof(struct dcons_buf, iptr[port]));
if (len < 0) {
if (errno == ETIMEDOUT)
if (retry -- > 0)
goto again;
dconschat_ready(dc, 0, "write ptr failed");
return(-1);
}
return(0);
}
static int
dconschat_write_socket(int fd, char *buf, int len)
{
write(fd, buf, len);
if (verbose > 1) {
buf[len] = 0;
printf("<- %s\n", buf);
}
return (0);
}
static void
dconschat_init_socket(struct dcons_state *dc, int port, char *host, int sport)
{
struct addrinfo hints, *res;
int on = 1, error;
char service[10];
struct kevent kev;
struct dcons_port *p;
p = &dc->port[port];
p->port = port;
p->sport = sport;
p->infd = p->outfd = -1;
if (sport < 0)
return;
if (sport == 0) {
/* Use stdin and stdout */
p->infd = STDIN_FILENO;
p->outfd = STDOUT_FILENO;
p->s = -1;
if (tc_set == 0 &&
tcgetattr(STDIN_FILENO, &dc->tsave) == 0) {
dc->traw = dc->tsave;
cfmakeraw(&dc->traw);
tcsetattr(STDIN_FILENO, TCSADRAIN, &dc->traw);
tc_set = 1;
}
EV_SET(&kev, p->infd, EVFILT_READ, EV_ADD, NOTE_LOWAT, 1,
(void *)p);
kevent(dc->kq, &kev, 1, NULL, 0, &dc->zero);
return;
}
memset(&hints, 0, sizeof(hints));
hints.ai_flags = AI_PASSIVE;
#if 1 /* gdb can talk v4 only */
hints.ai_family = PF_INET;
#else
hints.ai_family = PF_UNSPEC;
#endif
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = 0;
if (verbose)
printf("%s:%d for port %d\n",
host == NULL ? "*" : host, sport, port);
snprintf(service, sizeof(service), "%d", sport);
error = getaddrinfo(host, service, &hints, &res);
if (error)
errx(1, "tcp/%s: %s\n", service, gai_strerror(error));
p->res = res;
p->s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (p->s < 0)
err(1, "socket");
setsockopt(p->s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
if (bind(p->s, p->res->ai_addr, p->res->ai_addrlen) < 0) {
err(1, "bind");
}
if (listen(p->s, 1) < 0)
err(1, "listen");
EV_SET(&kev, p->s, EVFILT_READ, EV_ADD | EV_ONESHOT, 0, 0, (void *)p);
error = kevent(dc->kq, &kev, 1, NULL, 0, &dc->to);
if (error < 0)
err(1, "kevent");
return;
}
static int
dconschat_accept_socket(struct dcons_state *dc, struct dcons_port *p)
{
socklen_t addrlen;
int ns, flags;
struct kevent kev;
/* accept connection */
addrlen = p->res->ai_addrlen;
ns = accept(p->s, p->res->ai_addr, &addrlen);
if (ns < 0)
err(1, "accept");
if (verbose)
printf("port%d accepted\n", p->port);
flags = fcntl(ns, F_GETFL, 0);
flags |= O_NDELAY;
fcntl(ns, F_SETFL, flags);
#if 1
if (IS_CONSOLE(p) && (dc->flags & F_TELNET) != 0) {
char sga[] = {IAC, WILL, TELOPT_SGA};
char linemode[] = {IAC, DONT, TELOPT_LINEMODE};
char echo[] = {IAC, WILL, TELOPT_ECHO};
char bin[] = {IAC, DO, TELOPT_BINARY};
write(ns, sga, sizeof(sga));
write(ns, linemode, sizeof(linemode));
write(ns, echo, sizeof(echo));
write(ns, bin, sizeof(bin));
p->skip_read = 0;
}
#endif
/* discard backlog on GDB port */
if (IS_GDB(p)) {
char buf[2048];
int len;
while ((len = dconschat_read_dcons(dc, DCONS_GDB, &buf[0],
2048)) > 0)
if (verbose)
printf("discard %d chars on GDB port\n", len);
}
p->infd = p->outfd = ns;
EV_SET(&kev, ns, EVFILT_READ, EV_ADD, NOTE_LOWAT, 1, (void *)p);
kevent(dc->kq, &kev, 1, NULL, 0, &dc->zero);
return(0);
}
static int
dconschat_read_filter(struct dcons_state *dc, struct dcons_port *p,
u_char *sp, int slen, u_char *dp, int *dlen)
{
int skip;
char *buf;
while (slen > 0) {
skip = 0;
if (IS_CONSOLE(p)) {
if ((dc->flags & F_TELNET) != 0) {
/* XXX Telnet workarounds */
if (p->skip_read -- > 0) {
sp ++;
slen --;
continue;
}
if (*sp == IAC) {
if (verbose)
printf("(IAC)");
p->skip_read = 2;
sp ++;
slen --;
continue;
}
if (*sp == 0) {
if (verbose)
printf("(0 stripped)");
sp ++;
slen --;
continue;
}
}
switch (dc->escape_state) {
case STATE1:
if (*sp == dc->escape) {
skip = 1;
dc->escape_state = STATE2;
} else
dc->escape_state = STATE0;
break;
case STATE2:
dc->escape_state = STATE0;
skip = 1;
if (*sp == '.')
dconschat_cleanup(0);
else if (*sp == CTRL('B')) {
bcopy(abreak, dp, 3);
dp += 3;
*dlen += 3;
}
else if (*sp == CTRL('G'))
dconschat_fork_gdb(dc, p);
else if ((*sp == CTRL('R'))
&& (dc->reset != 0)) {
dc->escape_state = STATE3;
buf = "\r\n[Are you sure to reset target? (y/N)]";
write(p->outfd, buf, strlen(buf));
} else if (*sp == CTRL('Z'))
dconschat_suspend(dc, p);
else {
skip = 0;
*dp++ = dc->escape;
(*dlen) ++;
}
break;
case STATE3:
dc->escape_state = STATE0;
skip = 1;
if (*sp == 'y')
dconschat_reset_target(dc, p);
else {
write(p->outfd, sp, 1);
write(p->outfd, "\r\n", 2);
}
break;
}
if (*sp == KEY_CR)
dc->escape_state = STATE1;
} else if (IS_GDB(p)) {
/* GDB: ^C -> CR+~+^B */
if (*sp == CTRL('C') && (dc->flags & F_ALT_BREAK) != 0) {
bcopy(abreak, dp, 3);
dp += 3;
sp ++;
*dlen += 3;
/* discard rest of the packet */
slen = 0;
break;
}
}
if (!skip) {
*dp++ = *sp;
(*dlen) ++;
}
sp ++;
slen --;
}
return (*dlen);
}
static int
dconschat_read_socket(struct dcons_state *dc, struct dcons_port *p)
{
struct kevent kev;
int len, wlen;
char rbuf[MAX_XFER], wbuf[MAX_XFER+2];
if ((len = read(p->infd, rbuf, sizeof(rbuf))) > 0) {
wlen = 0;
dconschat_read_filter(dc, p, rbuf, len, wbuf, &wlen);
/* XXX discard if not ready*/
if (wlen > 0 && (dc->flags & F_READY) != 0) {
dconschat_write_dcons(dc, p->port, wbuf, wlen);
if (verbose > 1) {
wbuf[wlen] = 0;
printf("-> %s\n", wbuf);
} else if (verbose == 1) {
printf("(%d)", wlen);
fflush(stdout);
}
}
} else {
if (verbose) {
if (len == 0)
warnx("port%d: closed", p->port);
else
warn("port%d: read", p->port);
}
EV_SET(&kev, p->infd, EVFILT_READ,
EV_DELETE, 0, 0, NULL);
kevent(dc->kq, &kev, 1, NULL, 0, &dc->zero);
close(p->infd);
close(p->outfd);
/* XXX exit for pipe case XXX */
EV_SET(&kev, p->s, EVFILT_READ,
EV_ADD | EV_ONESHOT, 0, 0, (void *) p);
kevent(dc->kq, &kev, 1, NULL, 0, &dc->zero);
p->infd = p->outfd = -1;
}
return(0);
}
#define NEVENT 5
static int
dconschat_proc_socket(struct dcons_state *dc)
{
struct kevent elist[NEVENT], *e;
int i, n;
struct dcons_port *p;
n = kevent(dc->kq, NULL, 0, elist, NEVENT, &dc->to);
for (i = 0; i < n; i ++) {
e = &elist[i];
p = (struct dcons_port *)e->udata;
if (e->ident == p->s) {
dconschat_accept_socket(dc, p);
} else {
dconschat_read_socket(dc, p);
}
}
return(0);
}
static int
dconschat_proc_dcons(struct dcons_state *dc)
{
int port, len, err;
char buf[MAX_XFER];
struct dcons_port *p;
err = dconschat_get_ptr(dc);
if (err) {
/* XXX we should stop write operation too. */
return err;
}
for (port = 0; port < DCONS_NPORT; port ++) {
p = &dc->port[port];
if (p->infd < 0)
continue;
while ((len = dconschat_read_dcons(dc, port, buf,
sizeof(buf))) > 0) {
dconschat_write_socket(p->outfd, buf, len);
if ((err = dconschat_get_ptr(dc)))
return (err);
}
if ((dc->flags & F_ONE_SHOT) != 0 && len <= 0)
dconschat_cleanup(0);
}
return 0;
}
static int
dconschat_start_session(struct dcons_state *dc)
{
int counter = 0;
int retry = 0;
int retry_unit_init = MAX(1, poll_hz / 10);
int retry_unit_offline = poll_hz * DCONS_POLL_OFFLINE;
int retry_unit = retry_unit_init;
int retry_max = retry_unit_offline / retry_unit;
while (1) {
if (((dc->flags & F_READY) == 0) && ++counter > retry_unit) {
counter = 0;
retry ++;
if (retry > retry_max)
retry_unit = retry_unit_offline;
if (verbose) {
printf("%d/%d ", retry, retry_max);
fflush(stdout);
}
dconschat_fetch_header(dc);
}
if ((dc->flags & F_READY) != 0) {
counter = 0;
retry = 0;
retry_unit = retry_unit_init;
dconschat_proc_dcons(dc);
}
dconschat_proc_socket(dc);
}
return (0);
}
static void
usage(void)
{
fprintf(stderr,
"usage: dconschat [-brvwRT1] [-h hz] [-C port] [-G port]\n"
"\t\t\t[-M core] [-N system]\n"
"\t\t\t[-u unit] [-a address] [-t target_eui64]\n"
"\t-b translate ctrl-C to CR+~+ctrl-B on gdb port\n"
"\t-v verbose\n"
"\t-w listen on wildcard address rather than localhost\n"
"\t-r replay old buffer on connection\n"
"\t-R read-only\n"
"\t-T enable Telnet protocol workaround on console port\n"
"\t-1 one shot: read buffer and exit\n"
"\t-h polling rate\n"
"\t-C port number for console port\n"
"\t-G port number for gdb port\n"
"\t(for KVM)\n"
"\t-M core file\n"
"\t-N system file\n"
"\t(for FireWire)\n"
"\t-u specify unit number of the bus\n"
"\t-t EUI64 of target host (must be specified)\n"
"\t-a physical address of dcons buffer on target host\n"
);
exit(0);
}
int
main(int argc, char **argv)
{
struct dcons_state *dc;
struct fw_eui64 eui;
struct eui64 target;
char devname[256], *core = NULL, *system = NULL;
int i, ch, error;
int unit=0, wildcard=0;
int port[DCONS_NPORT];
bzero(&sc, sizeof(sc));
dc = &sc;
dc->flags |= USE_CROM ? F_USE_CROM : 0;
/* default ports */
port[0] = 0; /* stdin/out for console */
port[1] = -1; /* disable gdb port */
/* default escape char */
dc->escape = KEY_TILDE;
while ((ch = getopt(argc, argv, "a:be:h:rt:u:vwC:G:M:N:RT1")) != -1) {
switch(ch) {
case 'a':
dc->paddr = strtoull(optarg, NULL, 0);
dc->flags &= ~F_USE_CROM;
break;
case 'b':
dc->flags |= F_ALT_BREAK;
break;
case 'e':
dc->escape = optarg[0];
break;
case 'h':
poll_hz = strtoul(optarg, NULL, 0);
if (poll_hz == 0)
poll_hz = DCONS_POLL_HZ;
break;
case 'r':
dc->flags |= F_REPLAY;
break;
case 't':
if (eui64_hostton(optarg, &target) != 0 &&
eui64_aton(optarg, &target) != 0)
errx(1, "invalid target: %s", optarg);
eui.hi = ntohl(*(u_int32_t*)&(target.octet[0]));
eui.lo = ntohl(*(u_int32_t*)&(target.octet[4]));
dc->type = TYPE_FW;
break;
case 'u':
unit = strtol(optarg, NULL, 0);
break;
case 'v':
verbose ++;
break;
case 'w':
wildcard = 1;
break;
case 'C':
port[0] = strtol(optarg, NULL, 0);
break;
case 'G':
port[1] = strtol(optarg, NULL, 0);
break;
case 'M':
core = optarg;
break;
case 'N':
system = optarg;
break;
case 'R':
dc->flags |= F_RD_ONLY;
break;
case 'T':
dc->flags |= F_TELNET;
break;
case '1':
dc->flags |= F_ONE_SHOT | F_REPLAY;
break;
default:
usage();
}
}
if (dc->paddr == 0 && (dc->flags & F_USE_CROM) == 0) {
warnx("no address specified");
usage();
}
if (port[0] < 0 && port[1] < 0) {
warnx("no port specified");
usage();
}
/* set signal handler */
signal(SIGHUP, dconschat_cleanup);
signal(SIGINT, dconschat_cleanup);
signal(SIGPIPE, dconschat_cleanup);
signal(SIGTERM, dconschat_cleanup);
/* init firewire */
switch (dc->type) {
case TYPE_FW:
#define MAXDEV 10
for (i = 0; i < MAXDEV; i ++) {
snprintf(devname, sizeof(devname),
"/dev/fwmem%d.%d", unit, i);
dc->fd = open(devname, O_RDWR);
if (dc->fd >= 0)
goto found;
}
err(1, "open");
found:
error = ioctl(dc->fd, FW_SDEUI64, &eui);
if (error)
err(1, "ioctl");
break;
case TYPE_KVM:
{
struct nlist nl[] = {{"dcons_buf"}, {""}};
void *dcons_buf;
dc->kd = kvm_open(system, core, NULL,
(dc->flags & F_RD_ONLY) ? O_RDONLY : O_RDWR, "dconschat");
if (dc->kd == NULL)
errx(1, "kvm_open");
if (kvm_nlist(dc->kd, nl) < 0)
errx(1, "kvm_nlist: %s", kvm_geterr(dc->kd));
if (kvm_read(dc->kd, nl[0].n_value, &dcons_buf,
sizeof(void *)) < 0)
errx(1, "kvm_read: %s", kvm_geterr(dc->kd));
dc->paddr = (uintptr_t)dcons_buf;
if (verbose)
printf("dcons_buf: 0x%x\n", (uint)dc->paddr);
break;
}
}
dconschat_fetch_header(dc);
/* init sockets */
dc->kq = kqueue();
if (poll_hz == 1) {
dc->to.tv_sec = 1;
dc->to.tv_nsec = 0;
} else {
dc->to.tv_sec = 0;
dc->to.tv_nsec = 1000 * 1000 * 1000 / poll_hz;
}
dc->zero.tv_sec = 0;
dc->zero.tv_nsec = 0;
for (i = 0; i < DCONS_NPORT; i++)
dconschat_init_socket(dc, i,
wildcard ? NULL : "localhost", port[i]);
dconschat_start_session(dc);
for (i = 0; i < DCONS_NPORT; i++) {
freeaddrinfo(dc->port[i].res);
}
return (0);
}
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