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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_lengths(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_lengths(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_lengths(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)
- {
- if (argc == 1)
- {
- if (strncasecmp(c->name, args[0], c->unique_len))
- continue;
-
- if (strncasecmp(c->name, args[0], strlen(args[0])))
- continue;
- }
-
- 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;
- }
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