/*
* main.c
*
* Copyright (c) 1996-1999 Whistle Communications, Inc.
* All rights reserved.
*
* Subject to the following obligations and disclaimer of warranty, use and
* redistribution of this software, in source or object code forms, with or
* without modifications are expressly permitted by Whistle Communications;
* provided, however, that:
* 1. Any and all reproductions of the source or object code must include the
* copyright notice above and the following disclaimer of warranties; and
* 2. No rights are granted, in any manner or form, to use Whistle
* Communications, Inc. trademarks, including the mark "WHISTLE
* COMMUNICATIONS" on advertising, endorsements, or otherwise except as
* such appears in the above copyright notice or in the software.
*
* THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
* TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
* REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
* INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
* WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
* REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
* SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
* IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER 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 WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* $Whistle: main.c,v 1.12 1999/11/29 19:17:46 archie Exp $
*/
#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/select.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
#ifdef EDITLINE
#include <signal.h>
#include <histedit.h>
#include <pthread.h>
#endif
#include <netgraph.h>
#include "ngctl.h"
#define PROMPT "+ "
#define MAX_ARGS 512
#define WHITESPACE " \t\r\n\v\f"
#define DUMP_BYTES_PER_LINE 16
/* Internal functions */
static int ReadFile(FILE *fp);
static void ReadSockets(fd_set *);
static int DoParseCommand(const char *line);
static int DoCommand(int ac, char **av);
static int DoInteractive(void);
static const struct ngcmd *FindCommand(const char *string);
static int MatchCommand(const struct ngcmd *cmd, const char *s);
static void Usage(const char *msg);
static int ReadCmd(int ac, char **av);
static int HelpCmd(int ac, char **av);
static int QuitCmd(int ac, char **av);
#ifdef EDITLINE
static volatile sig_atomic_t unblock;
static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
#endif
/* List of commands */
static const struct ngcmd *const cmds[] = {
&config_cmd,
&connect_cmd,
&debug_cmd,
&dot_cmd,
&help_cmd,
&list_cmd,
&mkpeer_cmd,
&msg_cmd,
&name_cmd,
&read_cmd,
&rmhook_cmd,
&show_cmd,
&shutdown_cmd,
&status_cmd,
&types_cmd,
&write_cmd,
&quit_cmd,
NULL
};
/* Commands defined in this file */
const struct ngcmd read_cmd = {
ReadCmd,
"read <filename>",
"Read and execute commands from a file",
NULL,
{ "source", "." }
};
const struct ngcmd help_cmd = {
HelpCmd,
"help [command]",
"Show command summary or get more help on a specific command",
NULL,
{ "?" }
};
const struct ngcmd quit_cmd = {
QuitCmd,
"quit",
"Exit program",
NULL,
{ "exit" }
};
/* Our control and data sockets */
int csock, dsock;
/*
* main()
*/
int
main(int ac, char *av[])
{
char name[NG_NODESIZ];
int interactive = isatty(0) && isatty(1);
FILE *fp = NULL;
int ch, rtn = 0;
/* Set default node name */
snprintf(name, sizeof(name), "ngctl%d", getpid());
/* Parse command line */
while ((ch = getopt(ac, av, "df:n:")) != -1) {
switch (ch) {
case 'd':
NgSetDebug(NgSetDebug(-1) + 1);
break;
case 'f':
if (strcmp(optarg, "-") == 0)
fp = stdin;
else if ((fp = fopen(optarg, "r")) == NULL)
err(EX_NOINPUT, "%s", optarg);
break;
case 'n':
snprintf(name, sizeof(name), "%s", optarg);
break;
case '?':
default:
Usage((char *)NULL);
break;
}
}
ac -= optind;
av += optind;
/* Create a new socket node */
if (NgMkSockNode(name, &csock, &dsock) < 0)
err(EX_OSERR, "can't create node");
/* Do commands as requested */
if (ac == 0) {
if (fp != NULL) {
rtn = ReadFile(fp);
} else if (interactive) {
rtn = DoInteractive();
} else
Usage("no command specified");
} else {
rtn = DoCommand(ac, av);
}
/* Convert command return code into system exit code */
switch (rtn) {
case CMDRTN_OK:
case CMDRTN_QUIT:
rtn = 0;
break;
case CMDRTN_USAGE:
rtn = EX_USAGE;
break;
case CMDRTN_ERROR:
rtn = EX_OSERR;
break;
}
return (rtn);
}
/*
* Process commands from a file
*/
static int
ReadFile(FILE *fp)
{
char line[LINE_MAX];
int num, rtn;
for (num = 1; fgets(line, sizeof(line), fp) != NULL; num++) {
if (*line == '#')
continue;
if ((rtn = DoParseCommand(line)) != 0) {
warnx("line %d: error in file", num);
return (rtn);
}
}
return (CMDRTN_OK);
}
#ifdef EDITLINE
/* Signal handler for Monitor() thread. */
static void
Unblock(int signal __unused)
{
unblock = 1;
}
/*
* Thread that monitors csock and dsock while main thread
* can be blocked in el_gets().
*/
static void *
Monitor(void *v __unused)
{
struct sigaction act;
const int maxfd = MAX(csock, dsock) + 1;
act.sa_handler = Unblock;
sigemptyset(&act.sa_mask);
act.sa_flags = 0;
sigaction(SIGUSR1, &act, NULL);
pthread_mutex_lock(&mutex);
for (;;) {
fd_set rfds;
/* See if any data or control messages are arriving. */
FD_ZERO(&rfds);
FD_SET(csock, &rfds);
FD_SET(dsock, &rfds);
unblock = 0;
if (select(maxfd, &rfds, NULL, NULL, NULL) <= 0) {
if (errno == EINTR) {
if (unblock == 1)
pthread_cond_wait(&cond, &mutex);
continue;
}
err(EX_OSERR, "select");
}
ReadSockets(&rfds);
}
return (NULL);
}
static char *
Prompt(EditLine *el __unused)
{
return (PROMPT);
}
/*
* Here we start a thread, that will monitor the netgraph
* sockets and catch any unexpected messages or data on them,
* that can arrive while user edits his/her commands.
*
* Whenever we expect data on netgraph sockets, we send signal
* to monitoring thread. The signal forces it to exit select()
* system call and sleep on condvar until we wake it. While
* monitoring thread sleeps, we can do our work with netgraph
* sockets.
*/
static int
DoInteractive(void)
{
pthread_t monitor;
EditLine *el;
History *hist;
HistEvent hev = { 0, "" };
(*help_cmd.func)(0, NULL);
pthread_create(&monitor, NULL, Monitor, NULL);
el = el_init(getprogname(), stdin, stdout, stderr);
if (el == NULL)
return (CMDRTN_ERROR);
el_set(el, EL_PROMPT, Prompt);
el_set(el, EL_SIGNAL, 1);
el_set(el, EL_EDITOR, "emacs");
hist = history_init();
if (hist == NULL)
return (CMDRTN_ERROR);
history(hist, &hev, H_SETSIZE, 100);
history(hist, &hev, H_SETUNIQUE, 1);
el_set(el, EL_HIST, history, (const char *)hist);
el_source(el, NULL);
for (;;) {
const char *buf;
int count;
if ((buf = el_gets(el, &count)) == NULL) {
printf("\n");
break;
}
history(hist, &hev, H_ENTER, buf);
pthread_kill(monitor, SIGUSR1);
pthread_mutex_lock(&mutex);
if (DoParseCommand(buf) == CMDRTN_QUIT) {
pthread_mutex_unlock(&mutex);
break;
}
pthread_cond_signal(&cond);
pthread_mutex_unlock(&mutex);
}
history_end(hist);
el_end(el);
pthread_cancel(monitor);
return (CMDRTN_QUIT);
}
#else /* !EDITLINE */
/*
* Interactive mode w/o libedit functionality.
*/
static int
DoInteractive(void)
{
const int maxfd = MAX(csock, dsock) + 1;
(*help_cmd.func)(0, NULL);
while (1) {
struct timeval tv;
fd_set rfds;
/* See if any data or control messages are arriving */
FD_ZERO(&rfds);
FD_SET(csock, &rfds);
FD_SET(dsock, &rfds);
memset(&tv, 0, sizeof(tv));
if (select(maxfd, &rfds, NULL, NULL, &tv) <= 0) {
/* Issue prompt and wait for anything to happen */
printf("%s", PROMPT);
fflush(stdout);
FD_ZERO(&rfds);
FD_SET(0, &rfds);
FD_SET(csock, &rfds);
FD_SET(dsock, &rfds);
if (select(maxfd, &rfds, NULL, NULL, NULL) < 0)
err(EX_OSERR, "select");
/* If not user input, print a newline first */
if (!FD_ISSET(0, &rfds))
printf("\n");
}
ReadSockets(&rfds);
/* Get any user input */
if (FD_ISSET(0, &rfds)) {
char buf[LINE_MAX];
if (fgets(buf, sizeof(buf), stdin) == NULL) {
printf("\n");
break;
}
if (DoParseCommand(buf) == CMDRTN_QUIT)
break;
}
}
return (CMDRTN_QUIT);
}
#endif /* !EDITLINE */
/*
* Read and process data on netgraph control and data sockets.
*/
static void
ReadSockets(fd_set *rfds)
{
/* Display any incoming control message. */
if (FD_ISSET(csock, rfds))
MsgRead();
/* Display any incoming data packet. */
if (FD_ISSET(dsock, rfds)) {
char hook[NG_HOOKSIZ];
u_char *buf;
int rl;
/* Read packet from socket. */
if ((rl = NgAllocRecvData(dsock, &buf, hook)) < 0)
err(EX_OSERR, "reading hook \"%s\"", hook);
if (rl == 0)
errx(EX_OSERR, "EOF from hook \"%s\"?", hook);
/* Write packet to stdout. */
printf("Rec'd data packet on hook \"%s\":\n", hook);
DumpAscii(buf, rl);
free(buf);
}
}
/*
* Parse a command line and execute the command
*/
static int
DoParseCommand(const char *line)
{
char *av[MAX_ARGS];
int ac;
/* Parse line */
for (ac = 0, av[0] = strtok((char *)line, WHITESPACE);
ac < MAX_ARGS - 1 && av[ac];
av[++ac] = strtok(NULL, WHITESPACE));
/* Do command */
return (DoCommand(ac, av));
}
/*
* Execute the command
*/
static int
DoCommand(int ac, char **av)
{
const struct ngcmd *cmd;
int rtn;
if (ac == 0 || *av[0] == 0)
return (CMDRTN_OK);
if ((cmd = FindCommand(av[0])) == NULL)
return (CMDRTN_ERROR);
if ((rtn = (*cmd->func)(ac, av)) == CMDRTN_USAGE)
warnx("usage: %s", cmd->cmd);
return (rtn);
}
/*
* Find a command
*/
static const struct ngcmd *
FindCommand(const char *string)
{
int k, found = -1;
for (k = 0; cmds[k] != NULL; k++) {
if (MatchCommand(cmds[k], string)) {
if (found != -1) {
warnx("\"%s\": ambiguous command", string);
return (NULL);
}
found = k;
}
}
if (found == -1) {
warnx("\"%s\": unknown command", string);
return (NULL);
}
return (cmds[found]);
}
/*
* See if string matches a prefix of "cmd" (or an alias) case insensitively
*/
static int
MatchCommand(const struct ngcmd *cmd, const char *s)
{
int a;
/* Try to match command, ignoring the usage stuff */
if (strlen(s) <= strcspn(cmd->cmd, WHITESPACE)) {
if (strncasecmp(s, cmd->cmd, strlen(s)) == 0)
return (1);
}
/* Try to match aliases */
for (a = 0; a < MAX_CMD_ALIAS && cmd->aliases[a] != NULL; a++) {
if (strlen(cmd->aliases[a]) >= strlen(s)) {
if (strncasecmp(s, cmd->aliases[a], strlen(s)) == 0)
return (1);
}
}
/* No match */
return (0);
}
/*
* ReadCmd()
*/
static int
ReadCmd(int ac, char **av)
{
FILE *fp;
int rtn;
/* Open file */
switch (ac) {
case 2:
if ((fp = fopen(av[1], "r")) == NULL) {
warn("%s", av[1]);
return (CMDRTN_ERROR);
}
break;
default:
return (CMDRTN_USAGE);
}
/* Process it */
rtn = ReadFile(fp);
fclose(fp);
return (rtn);
}
/*
* HelpCmd()
*/
static int
HelpCmd(int ac, char **av)
{
const struct ngcmd *cmd;
int k;
switch (ac) {
case 0:
case 1:
/* Show all commands */
printf("Available commands:\n");
for (k = 0; cmds[k] != NULL; k++) {
char *s, buf[100];
cmd = cmds[k];
snprintf(buf, sizeof(buf), "%s", cmd->cmd);
for (s = buf; *s != '\0' && !isspace(*s); s++);
*s = '\0';
printf(" %-10s %s\n", buf, cmd->desc);
}
return (CMDRTN_OK);
default:
/* Show help on a specific command */
if ((cmd = FindCommand(av[1])) != NULL) {
printf("usage: %s\n", cmd->cmd);
if (cmd->aliases[0] != NULL) {
int a = 0;
printf("Aliases: ");
while (1) {
printf("%s", cmd->aliases[a++]);
if (a == MAX_CMD_ALIAS
|| cmd->aliases[a] == NULL) {
printf("\n");
break;
}
printf(", ");
}
}
printf("Summary: %s\n", cmd->desc);
if (cmd->help != NULL) {
const char *s;
char buf[65];
int tot, len, done;
printf("Description:\n");
for (s = cmd->help; *s != '\0'; s += len) {
while (isspace(*s))
s++;
tot = snprintf(buf,
sizeof(buf), "%s", s);
len = strlen(buf);
done = len == tot;
if (!done) {
while (len > 0
&& !isspace(buf[len-1]))
buf[--len] = '\0';
}
printf(" %s\n", buf);
}
}
}
}
return (CMDRTN_OK);
}
/*
* QuitCmd()
*/
static int
QuitCmd(int ac __unused, char **av __unused)
{
return (CMDRTN_QUIT);
}
/*
* Dump data in hex and ASCII form
*/
void
DumpAscii(const u_char *buf, int len)
{
char ch, sbuf[100];
int k, count;
for (count = 0; count < len; count += DUMP_BYTES_PER_LINE) {
snprintf(sbuf, sizeof(sbuf), "%04x: ", count);
for (k = 0; k < DUMP_BYTES_PER_LINE; k++) {
if (count + k < len) {
snprintf(sbuf + strlen(sbuf),
sizeof(sbuf) - strlen(sbuf),
"%02x ", buf[count + k]);
} else {
snprintf(sbuf + strlen(sbuf),
sizeof(sbuf) - strlen(sbuf), " ");
}
}
snprintf(sbuf + strlen(sbuf), sizeof(sbuf) - strlen(sbuf), " ");
for (k = 0; k < DUMP_BYTES_PER_LINE; k++) {
if (count + k < len) {
ch = isprint(buf[count + k]) ?
buf[count + k] : '.';
snprintf(sbuf + strlen(sbuf),
sizeof(sbuf) - strlen(sbuf), "%c", ch);
} else {
snprintf(sbuf + strlen(sbuf),
sizeof(sbuf) - strlen(sbuf), " ");
}
}
printf("%s\n", sbuf);
}
}
/*
* Usage()
*/
static void
Usage(const char *msg)
{
if (msg)
warnx("%s", msg);
fprintf(stderr,
"usage: ngctl [-d] [-f file] [-n name] [command ...]\n");
exit(EX_USAGE);
}
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