When ``ppp -direct'' is invoked by a program that uses pipe(2) to
create stdin and stdout, don't blindly try to use stdin as a bi-directional channel. Instead, detect the pipe and set up a special exec handler that indirects write() calls through stdout. This fixes the problem where ``set device "!ssh -e none host ppp -direct label"'' no longer works with an openssh-5.2 server side as that version of openssh ignores the USE_PIPES config setting and *always* uses pipes (rather than socketpair) for stdin/stdout channels. MFC after: 3 days
This commit is contained in:
parent
c5e246d446
commit
887ff31f06
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=196514
@ -35,7 +35,9 @@
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#include <stdio.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdlib.h>
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#include <string.h>
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#include <string.h>
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#include <sysexits.h>
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#include <sys/wait.h>
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#include <sys/wait.h>
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#include <sys/stat.h>
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#include <sys/uio.h>
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#include <sys/uio.h>
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#include <termios.h>
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#include <termios.h>
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#include <unistd.h>
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#include <unistd.h>
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@ -63,24 +65,106 @@
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#include "cbcp.h"
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#include "cbcp.h"
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#include "datalink.h"
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#include "datalink.h"
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#include "id.h"
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#include "id.h"
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#include "main.h"
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#include "exec.h"
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#include "exec.h"
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static struct device execdevice = {
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struct execdevice {
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struct device dev; /* What struct physical knows about */
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int fd_out; /* output descriptor */
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};
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#define device2exec(d) ((d)->type == EXEC_DEVICE ? (struct execdevice *)d : NULL)
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unsigned
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exec_DeviceSize(void)
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{
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return sizeof(struct execdevice);
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}
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static void
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exec_Free(struct physical *p)
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{
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struct execdevice *dev = device2exec(p->handler);
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if (dev->fd_out != -1)
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close(dev->fd_out);
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free(dev);
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}
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static void
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exec_device2iov(struct device *d, struct iovec *iov, int *niov,
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int maxiov __unused, int *auxfd, int *nauxfd)
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{
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struct execdevice *dev;
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int sz = physical_MaxDeviceSize();
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iov[*niov].iov_base = d = realloc(d, sz);
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if (d == NULL) {
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log_Printf(LogALERT, "Failed to allocate memory: %d\n", sz);
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AbortProgram(EX_OSERR);
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}
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iov[*niov].iov_len = sz;
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(*niov)++;
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dev = device2exec(d);
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if (dev->fd_out >= 0) {
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*auxfd = dev->fd_out;
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(*nauxfd)++;
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}
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}
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static int
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exec_RemoveFromSet(struct physical *p, fd_set *r, fd_set *w, fd_set *e)
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{
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struct execdevice *dev = device2exec(p->handler);
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int sets;
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p->handler->removefromset = NULL;
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sets = physical_RemoveFromSet(p, r, w, e);
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p->handler->removefromset = exec_RemoveFromSet;
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if (dev->fd_out >= 0) {
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if (w && FD_ISSET(dev->fd_out, w)) {
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FD_CLR(dev->fd_out, w);
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log_Printf(LogTIMER, "%s: fdunset(w) %d\n", p->link.name, dev->fd_out);
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sets++;
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}
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if (e && FD_ISSET(dev->fd_out, e)) {
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FD_CLR(dev->fd_out, e);
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log_Printf(LogTIMER, "%s: fdunset(e) %d\n", p->link.name, dev->fd_out);
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sets++;
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}
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}
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return sets;
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}
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static ssize_t
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exec_Write(struct physical *p, const void *v, size_t n)
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{
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struct execdevice *dev = device2exec(p->handler);
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int fd = dev->fd_out == -1 ? p->fd : dev->fd_out;
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return write(fd, v, n);
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}
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static struct device baseexecdevice = {
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EXEC_DEVICE,
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EXEC_DEVICE,
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"exec",
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"exec",
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0,
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0,
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{ CD_NOTREQUIRED, 0 },
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{ CD_NOTREQUIRED, 0 },
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NULL,
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NULL,
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exec_RemoveFromSet,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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exec_Free,
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NULL,
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NULL,
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NULL,
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exec_Write,
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NULL,
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exec_device2iov,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL
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NULL
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@ -88,31 +172,97 @@ static struct device execdevice = {
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struct device *
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struct device *
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exec_iov2device(int type, struct physical *p, struct iovec *iov,
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exec_iov2device(int type, struct physical *p, struct iovec *iov,
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int *niov, int maxiov __unused, int *auxfd __unused,
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int *niov, int maxiov __unused, int *auxfd, int *nauxfd)
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int *nauxfd __unused)
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{
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{
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if (type == EXEC_DEVICE) {
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if (type == EXEC_DEVICE) {
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free(iov[(*niov)++].iov_base);
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struct execdevice *dev = (struct execdevice *)iov[(*niov)++].iov_base;
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physical_SetupStack(p, execdevice.name, PHYSICAL_NOFORCE);
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return &execdevice;
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dev = realloc(dev, sizeof *dev); /* Reduce to the correct size */
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if (dev == NULL) {
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log_Printf(LogALERT, "Failed to allocate memory: %d\n",
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(int)(sizeof *dev));
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AbortProgram(EX_OSERR);
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}
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if (*nauxfd) {
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dev->fd_out = *auxfd;
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(*nauxfd)--;
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} else
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dev->fd_out = -1;
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/* Refresh function pointers etc */
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memcpy(&dev->dev, &baseexecdevice, sizeof dev->dev);
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physical_SetupStack(p, dev->dev.name, PHYSICAL_NOFORCE);
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return &dev->dev;
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}
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}
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return NULL;
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return NULL;
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}
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}
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static int
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exec_UpdateSet(struct fdescriptor *d, fd_set *r, fd_set *w, fd_set *e, int *n)
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{
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struct physical *p = descriptor2physical(d);
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struct execdevice *dev = device2exec(p->handler);
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int result = 0;
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if (w && dev->fd_out >= 0) {
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FD_SET(dev->fd_out, w);
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log_Printf(LogTIMER, "%s: fdset(w) %d\n", p->link.name, dev->fd_out);
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result++;
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w = NULL;
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}
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if (e && dev->fd_out >= 0) {
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FD_SET(dev->fd_out, e);
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log_Printf(LogTIMER, "%s: fdset(e) %d\n", p->link.name, dev->fd_out);
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result++;
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}
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if (result && *n <= dev->fd_out)
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*n = dev->fd_out + 1;
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return result + physical_doUpdateSet(d, r, w, e, n, 0);
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}
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static int
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exec_IsSet(struct fdescriptor *d, const fd_set *fdset)
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{
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struct physical *p = descriptor2physical(d);
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struct execdevice *dev = device2exec(p->handler);
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int result = dev->fd_out >= 0 && FD_ISSET(dev->fd_out, fdset);
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result += physical_IsSet(d, fdset);
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return result;
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}
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struct device *
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struct device *
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exec_Create(struct physical *p)
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exec_Create(struct physical *p)
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{
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{
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if (p->fd < 0 && *p->name.full == '!') {
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struct execdevice *dev;
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dev = NULL;
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if (p->fd < 0) {
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if (*p->name.full == '!') {
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int fids[2], type;
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int fids[2], type;
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if ((dev = malloc(sizeof *dev)) == NULL) {
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log_Printf(LogWARN, "%s: Cannot allocate an exec device: %s\n",
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p->link.name, strerror(errno));
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return NULL;
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}
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dev->fd_out = -1;
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p->fd--; /* We own the device but maybe can't use it - change fd */
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p->fd--; /* We own the device but maybe can't use it - change fd */
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type = physical_IsSync(p) ? SOCK_DGRAM : SOCK_STREAM;
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type = physical_IsSync(p) ? SOCK_DGRAM : SOCK_STREAM;
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if (socketpair(AF_UNIX, type, PF_UNSPEC, fids) < 0)
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if (socketpair(AF_UNIX, type, PF_UNSPEC, fids) < 0) {
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log_Printf(LogPHASE, "Unable to create pipe for line exec: %s\n",
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log_Printf(LogPHASE, "Unable to create pipe for line exec: %s\n",
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strerror(errno));
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strerror(errno));
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else {
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free(dev);
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dev = NULL;
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} else {
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static int child_status; /* This variable is abused ! */
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static int child_status; /* This variable is abused ! */
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int stat, argc, i, ret, wret, pidpipe[2];
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int stat, argc, i, ret, wret, pidpipe[2];
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pid_t pid, realpid;
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pid_t pid, realpid;
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@ -128,6 +278,9 @@ exec_Create(struct physical *p)
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log_Printf(LogPHASE, "Unable to pipe for line exec: %s\n",
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log_Printf(LogPHASE, "Unable to pipe for line exec: %s\n",
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strerror(errno));
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strerror(errno));
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close(fids[1]);
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close(fids[1]);
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close(fids[0]);
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free(dev);
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dev = NULL;
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} else switch ((pid = fork())) {
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} else switch ((pid = fork())) {
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case -1:
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case -1:
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log_Printf(LogPHASE, "Unable to fork for line exec: %s\n",
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log_Printf(LogPHASE, "Unable to fork for line exec: %s\n",
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@ -135,15 +288,16 @@ exec_Create(struct physical *p)
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close(pidpipe[0]);
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close(pidpipe[0]);
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close(pidpipe[1]);
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close(pidpipe[1]);
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close(fids[1]);
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close(fids[1]);
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close(fids[0]);
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break;
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break;
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case 0:
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case 0:
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close(pidpipe[0]);
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close(pidpipe[0]);
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close(fids[0]);
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close(fids[0]);
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timer_TermService();
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timer_TermService();
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#ifndef NOSUID
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#ifndef NOSUID
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setuid(ID0realuid());
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setuid(ID0realuid());
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#endif
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#endif
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child_status = 0;
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child_status = 0;
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switch ((pid = vfork())) {
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switch ((pid = vfork())) {
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@ -221,13 +375,35 @@ exec_Create(struct physical *p)
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}
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}
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p->fd = fids[0];
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p->fd = fids[0];
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log_Printf(LogDEBUG, "Using descriptor %d for child\n", p->fd);
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log_Printf(LogDEBUG, "Using descriptor %d for child\n", p->fd);
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physical_SetupStack(p, execdevice.name, PHYSICAL_NOFORCE);
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}
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}
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}
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} else {
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struct stat st;
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if (fstat(p->fd, &st) != -1 && (st.st_mode & S_IFIFO)) {
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if ((dev = malloc(sizeof *dev)) == NULL)
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log_Printf(LogWARN, "%s: Cannot allocate an exec device: %s\n",
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p->link.name, strerror(errno));
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else if (p->fd == STDIN_FILENO) {
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log_Printf(LogPHASE, "%s: Using stdin/stdout to communicate with "
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"parent (pipe mode)\n", p->link.name);
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dev->fd_out = dup(STDOUT_FILENO);
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/* Hook things up so that we monitor dev->fd_out */
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p->desc.UpdateSet = exec_UpdateSet;
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p->desc.IsSet = exec_IsSet;
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} else
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dev->fd_out = -1;
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}
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}
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if (dev) {
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memcpy(&dev->dev, &baseexecdevice, sizeof dev->dev);
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physical_SetupStack(p, dev->dev.name, PHYSICAL_NOFORCE);
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if (p->cfg.cd.necessity != CD_DEFAULT)
|
if (p->cfg.cd.necessity != CD_DEFAULT)
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log_Printf(LogWARN, "Carrier settings ignored\n");
|
log_Printf(LogWARN, "Carrier settings ignored\n");
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return &execdevice;
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return &dev->dev;
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}
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close(fids[0]);
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}
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}
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}
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return NULL;
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return NULL;
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@ -32,4 +32,4 @@ struct device;
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extern struct device *exec_Create(struct physical *);
|
extern struct device *exec_Create(struct physical *);
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extern struct device *exec_iov2device(int, struct physical *,
|
extern struct device *exec_iov2device(int, struct physical *,
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struct iovec *, int *, int, int *, int *);
|
struct iovec *, int *, int, int *, int *);
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#define exec_DeviceSize physical_DeviceSize
|
extern unsigned exec_DeviceSize(void);
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|
@ -509,9 +509,11 @@ main(int argc, char **argv)
|
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if (!sw.fg)
|
if (!sw.fg)
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setsid();
|
setsid();
|
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} else {
|
} else {
|
||||||
/* -direct - STDIN_FILENO gets used by physical_Open */
|
/*
|
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|
* -direct - STDIN_FILENO gets used by physical_Open. STDOUT_FILENO
|
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|
* *may* get used in exec/pipe mode.
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||||||
|
*/
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prompt_TtyInit(NULL);
|
prompt_TtyInit(NULL);
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close(STDOUT_FILENO);
|
|
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close(STDERR_FILENO);
|
close(STDERR_FILENO);
|
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}
|
}
|
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} else {
|
} else {
|
||||||
|
@ -1017,6 +1017,7 @@ physical_Open(struct physical *p)
|
|||||||
p->fd = STDIN_FILENO;
|
p->fd = STDIN_FILENO;
|
||||||
for (h = 0; h < NDEVICES && p->handler == NULL && p->fd >= 0; h++)
|
for (h = 0; h < NDEVICES && p->handler == NULL && p->fd >= 0; h++)
|
||||||
p->handler = (*devices[h].create)(p);
|
p->handler = (*devices[h].create)(p);
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||||||
|
close(STDOUT_FILENO);
|
||||||
if (p->fd >= 0) {
|
if (p->fd >= 0) {
|
||||||
if (p->handler == NULL) {
|
if (p->handler == NULL) {
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||||||
physical_SetupStack(p, "unknown", PHYSICAL_NOFORCE);
|
physical_SetupStack(p, "unknown", PHYSICAL_NOFORCE);
|
||||||
|
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