diff options
Diffstat (limited to 'usr.sbin/ppp/exec.c')
-rw-r--r-- | usr.sbin/ppp/exec.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/usr.sbin/ppp/exec.c b/usr.sbin/ppp/exec.c new file mode 100644 index 0000000..da6ad96 --- /dev/null +++ b/usr.sbin/ppp/exec.c @@ -0,0 +1,160 @@ +/*- + * Copyright (c) 1999 Brian Somers <brian@Awfulhak.org> + * 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. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. + * + * $Id:$ + */ + +#include <sys/param.h> +#include <sys/socket.h> +#include <netinet/in.h> +#include <arpa/inet.h> +#include <netdb.h> +#include <netinet/in_systm.h> +#include <netinet/ip.h> +#include <sys/un.h> + +#include <errno.h> +#include <fcntl.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/wait.h> +#include <termios.h> +#include <unistd.h> + +#include "layer.h" +#include "defs.h" +#include "mbuf.h" +#include "log.h" +#include "sync.h" +#include "timer.h" +#include "lqr.h" +#include "hdlc.h" +#include "throughput.h" +#include "fsm.h" +#include "lcp.h" +#include "ccp.h" +#include "link.h" +#include "async.h" +#include "slcompress.h" +#include "iplist.h" +#include "ipcp.h" +#include "filter.h" +#include "descriptor.h" +#include "physical.h" +#include "mp.h" +#ifndef NORADIUS +#include "radius.h" +#endif +#include "chat.h" +#include "command.h" +#include "bundle.h" +#include "prompt.h" +#include "auth.h" +#include "chap.h" +#include "cbcp.h" +#include "datalink.h" +#include "exec.h" + +static int +exec_Open(struct physical *p) +{ + if (*p->name.full == '!') { + int fids[2]; + + if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, fids) < 0) + log_Printf(LogPHASE, "Unable to create pipe for line exec: %s\n", + strerror(errno)); + else { + int stat, argc; + pid_t pid; + char *argv[MAXARGS]; + + stat = fcntl(fids[0], F_GETFL, 0); + if (stat > 0) { + stat |= O_NONBLOCK; + fcntl(fids[0], F_SETFL, stat); + } + switch ((pid = fork())) { + case -1: + log_Printf(LogPHASE, "Unable to create pipe for line exec: %s\n", + strerror(errno)); + break; + + case 0: + close(fids[0]); + timer_TermService(); + setuid(geteuid()); + + switch (fork()) { + case 0: + break; + + case -1: + log_Printf(LogPHASE, "Unable to fork to drop parent: %s\n", + strerror(errno)); + default: + _exit(127); + } + + fids[1] = fcntl(fids[1], F_DUPFD, 3); + dup2(fids[1], STDIN_FILENO); + dup2(fids[1], STDOUT_FILENO); + dup2(fids[1], STDERR_FILENO); + + argc = MakeArgs(p->name.base, argv, VECSIZE(argv)); + command_Expand(argv, argc, (char const *const *)argv, + p->dl->bundle, 0); + execvp(*argv, argv); + fprintf(stderr, "execvp failed: %s: %s\r\n", *argv, strerror(errno)); + _exit(127); + break; + + default: + close(fids[1]); + p->fd = fids[0]; + waitpid(pid, &stat, 0); + log_Printf(LogDEBUG, "Using descriptor %d for child\n", p->fd); + physical_SetupStack(p, 1); + return 1; + } + } + } + + return 0; +} + +const struct device execdevice = { + EXEC_DEVICE, + "exec", + exec_Open, + NULL, + NULL, + NULL, + NULL, + NULL, + NULL, + NULL +}; |