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/***************************************************************************
* Copyright (C) 2005 by Dominic Rath *
* Dominic.Rath@gmx.de *
* *
* part of this file is taken from libcli (libcli.sourceforge.net) *
* Copyright (C) David Parrish (david@dparrish.com) *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include "command.h"
#include "log.h"
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <stdarg.h>
#include <stdio.h>
#include <unistd.h>
int handle_sleep_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
int build_unique_lenghts(command_context_t *context, command_t *commands)
{
command_t *c, *p;
/* iterate through all commands */
for (c = commands; c; c = c->next)
{
/* find out how many characters are required to uniquely identify a command */
for (c->unique_len = 1; c->unique_len <= strlen(c->name); c->unique_len++)
{
int foundmatch = 0;
/* for every command, see if the current length is enough */
for (p = commands; p; p = p->next)
{
/* ignore the command itself */
if (c == p)
continue;
/* compare commands up to the current length */
if (strncmp(p->name, c->name, c->unique_len) == 0)
foundmatch++;
}
/* when none of the commands matched, we've found the minimum length required */
if (!foundmatch)
break;
}
/* if the current command has children, build the unique lengths for them */
if (c->children)
build_unique_lenghts(context, c->children);
}
return ERROR_OK;
}
command_t* register_command(command_context_t *context, command_t *parent, char *name, int (*handler)(struct command_context_s *context, char* name, char** args, int argc), enum command_mode mode, char *help)
{
command_t *c, *p;
if (!context || !name)
return NULL;
c = malloc(sizeof(command_t));
c->name = strdup(name);
c->parent = parent;
c->children = NULL;
c->handler = handler;
c->mode = mode;
if (help)
c->help = strdup(help);
else
c->help = NULL;
c->unique_len = 0;
c->next = NULL;
/* place command in tree */
if (parent)
{
if (parent->children)
{
/* find last child */
for (p = parent->children; p && p->next; p = p->next);
if (p)
p->next = c;
}
else
{
parent->children = c;
}
}
else
{
if (context->commands)
{
/* find last command */
for (p = context->commands; p && p->next; p = p->next);
if (p)
p->next = c;
}
else
{
context->commands = c;
}
}
/* update unique lengths */
build_unique_lenghts(context, (parent) ? parent : context->commands);
return c;
}
int unregister_command(command_context_t *context, char *name)
{
command_t *c, *p = NULL, *c2;
if ((!context) || (!name))
return ERROR_INVALID_ARGUMENTS;
/* find command */
for (c = context->commands; c; c = c->next)
{
if (strcmp(name, c->name) == 0)
{
/* unlink command */
if (p)
{
p->next = c->next;
}
else
{
context->commands = c->next;
}
/* unregister children */
if (c->children)
{
for (c2 = c->children; c2; c2 = c2->next)
{
free(c2->name);
if (c2->help)
free(c2->help);
free(c2);
}
}
/* delete command */
free(c->name);
if (c->help)
free(c->help);
free(c);
}
/* remember the last command for unlinking */
p = c;
}
return ERROR_OK;
}
int parse_line(char *line, char *words[], int max_words)
{
int nwords = 0;
char *p = line;
char *word_start = line;
int inquote = 0;
while (nwords < max_words - 1)
{
/* check if we reached
* a terminating NUL
* a matching closing quote character " or '
* we're inside a word but not a quote, and the current character is whitespace
*/
if (!*p || *p == inquote || (word_start && !inquote && isspace(*p)))
{
/* we're inside a word or quote, and reached its end*/
if (word_start)
{
int len = p - word_start;
/* copy the word */
memcpy(words[nwords] = malloc(len + 1), word_start, len);
/* add terminating NUL */
words[nwords++][len] = 0;
}
/* we're done parsing the line */
if (!*p)
break;
/* skip over trailing quote or whitespace*/
if (inquote || isspace(*p))
p++;
inquote = 0;
word_start = 0;
}
else if (*p == '"' || *p == '\'')
{
/* we've reached the beginning of a quote */
inquote = *p++;
word_start = p;
}
else
{
/* we've reached the beginning of a new word */
if (!word_start)
word_start = p;
/* normal character, skip */
p++;
}
}
return nwords;
}
void command_print(command_context_t *context, char *format, ...)
{
va_list ap;
char *buffer = NULL;
int n, size = 0;
char *p;
va_start(ap, format);
/* process format string */
/* TODO: possible bug. va_list is undefined after the first call to vsnprintf */
while (!buffer || (n = vsnprintf(buffer, size, format, ap)) >= size)
{
/* increase buffer until it fits the whole string */
if (!(p = realloc(buffer, size += 4096)))
return;
buffer = p;
}
/* vsnprintf failed */
if (n < 0)
return;
p = buffer;
/* process lines in buffer */
do {
char *next = strchr(p, '\n');
if (next)
*next++ = 0;
if (context->output_handler)
context->output_handler(context, p);
p = next;
} while (p);
if (buffer)
free(buffer);
va_end(ap);
}
int find_and_run_command(command_context_t *context, command_t *commands, char *words[], int num_words, int start_word)
{
command_t *c;
for (c = commands; c; c = c->next)
{
if (strncasecmp(c->name, words[start_word], c->unique_len))
continue;
if (strncasecmp(c->name, words[start_word], strlen(words[start_word])))
continue;
if ((c->mode == context->mode) || (c->mode == COMMAND_ANY))
{
if (!c->children)
{
if (!c->handler)
{
command_print(context, "No handler for command");
break;
}
else
{
return c->handler(context, c->name, words + start_word + 1, num_words - start_word - 1);
}
}
else
{
if (start_word == num_words - 1)
{
command_print(context, "Incomplete command");
break;
}
return find_and_run_command(context, c->children, words, num_words, start_word + 1);
}
}
}
command_print(context, "Command %s not found", words[start_word]);
return ERROR_OK;
}
int command_run_line(command_context_t *context, char *line)
{
int nwords;
char *words[128] = {0};
int retval;
int i;
if ((!context) || (!line))
return ERROR_INVALID_ARGUMENTS;
/* skip preceding whitespace */
while (isspace(*line))
line++;
/* empty line, ignore */
if (!*line)
return ERROR_OK;
if (context->echo)
{
command_print(context, "%s", line);
}
nwords = parse_line(line, words, sizeof(words) / sizeof(words[0]));
if (nwords > 0)
retval = find_and_run_command(context, context->commands, words, nwords, 0);
else
return ERROR_INVALID_ARGUMENTS;
for (i = 0; i < nwords; i++)
free(words[i]);
return retval;
}
int command_run_file(command_context_t *context, FILE *file, enum command_mode mode)
{
int retval;
int old_command_mode;
char buffer[4096];
old_command_mode = context->mode;
context->mode = mode;
while (fgets(buffer, 4096, file))
{
char *p;
char *cmd, *end;
/* stop processing line after a comment (#, !) or a LF, CR were encountered */
if ((p = strpbrk(buffer, "#!\r\n")))
*p = 0;
/* skip over leading whitespace */
cmd = buffer;
while (isspace(*cmd))
cmd++;
/* empty (all whitespace) line? */
if (!*cmd)
continue;
/* search the end of the current line, ignore trailing whitespace */
for (p = end = cmd; *p; p++)
if (!isspace(*p))
end = p;
/* terminate end */
*++end = 0;
if (strcasecmp(cmd, "quit") == 0)
break;
/* run line */
if (command_run_line(context, cmd) == ERROR_COMMAND_CLOSE_CONNECTION)
break;
}
context->mode = old_command_mode;
return retval;
}
void command_print_help_line(command_context_t* context, struct command_s *command, int indent)
{
command_t *c;
char indents[32] = {0};
char *help = "no help available";
char name_buf[64];
int i;
for (i = 0; i < indent; i+=2)
{
indents[i*2] = ' ';
indents[i*2+1] = '-';
}
indents[i*2] = 0;
if ((command->mode == COMMAND_EXEC) || (command->mode == COMMAND_ANY))
{
if (command->help)
help = command->help;
snprintf(name_buf, 64, command->name);
strncat(name_buf, indents, 64);
command_print(context, "%20s\t%s", name_buf, help);
}
if (command->children)
{
for (c = command->children; c; c = c->next)
{
command_print_help_line(context, c, indent + 1);
}
}
}
int command_print_help(command_context_t* context, char* name, char** args, int argc)
{
command_t *c;
for (c = context->commands; c; c = c->next)
{
command_print_help_line(context, c, 0);
}
return ERROR_OK;
}
void command_set_output_handler(command_context_t* context, int (*output_handler)(struct command_context_s *context, char* line), void *priv)
{
context->output_handler = output_handler;
context->output_handler_priv = priv;
}
command_context_t* copy_command_context(command_context_t* context)
{
command_context_t* copy_context = malloc(sizeof(command_context_t));
*copy_context = *context;
return copy_context;
}
int command_done(command_context_t *context)
{
free(context);
return ERROR_OK;
}
command_context_t* command_init()
{
command_context_t* context = malloc(sizeof(command_context_t));
context->mode = COMMAND_EXEC;
context->commands = NULL;
context->current_target = 0;
context->echo = 0;
context->output_handler = NULL;
context->output_handler_priv = NULL;
register_command(context, NULL, "help", command_print_help,
COMMAND_EXEC, "display this help");
register_command(context, NULL, "sleep", handle_sleep_command,
COMMAND_ANY, "sleep for <n> milliseconds");
return context;
}
/* sleep command sleeps for <n> miliseconds
* this is useful in target startup scripts
*/
int handle_sleep_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
{
unsigned long duration = 0;
if (argc == 1)
{
duration = strtoul(args[0], NULL, 0);
usleep(duration * 1000);
}
return ERROR_OK;
}
|