interactive.c

   1 /*
   2  * Copyright (C) 2008 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file interactive.c \brief Commands for interactive mode. */
   8
   9 #include <ctype.h> /* isspace() */
  10
  11 #include "adu.h"
  12 #include "format.h"
  13 #include "user.h"
  14 #include "string.h"
  15 #include "cmdline.h"
  16 #include "select.cmdline.h"
  17 #include "select.h"
  18 #include "error.h"
  19
  20 /**
  21  * Describes one valid command for interactive mode.
  22  *
  23  * When invoked in interactive mode, adu reads commands from stdin. There's a
  24  * static array of all such commands.
  25  */
  26 struct interactive_command {
  27         /** The name of the command. */
  28         const char *name;
  29         /** Pointer to The function that is being executed. */
  30         int (*handler)(char *);
  31         /** Help text. */
  32         const char *desc;
  33 };
  34
  35 static struct uid_range *admissible_uids;
  36 static struct format_info *fi;
  37
  38 /** The set of supported interactive commands. */
  39 #define INTERACTIVE_COMMANDS \
  40         INTERACTIVE_COMMAND(set, "change the current configuration") \
  41         INTERACTIVE_COMMAND(reset, "reset configuration to defaults") \
  42         INTERACTIVE_COMMAND(help, "show list of commands and one-line descriptions") \
  43         INTERACTIVE_COMMAND(run, "start the query according to the current configuration") \
  44         INTERACTIVE_COMMAND(source, "read and execute interactive commands from a file")
  45
  46
  47 /** \cond doxygen is not smart enough for this */
  48 #define INTERACTIVE_COMMAND(name, desc) \
  49         static int icom_ ## name (char *line);
  50
  51 INTERACTIVE_COMMANDS
  52
  53 #undef INTERACTIVE_COMMAND
  54
  55 #define INTERACTIVE_COMMAND(_name, _desc) \
  56         { \
  57         .name = #_name, \
  58         .handler = icom_ ## _name, \
  59         .desc = _desc \
  60         },
  61
  62 struct interactive_command icmds[] = {
  63         INTERACTIVE_COMMANDS
  64         {.name  = NULL}
  65 };
  66 /** \endcond */
  67
  68 /** Iterate over the list of all interactive commands. */
  69 #define FOR_EACH_COMMAND(c) for (c = icmds; c->name; c++)
  70
  71 static int read_input_line(char *line, size_t size)
  72 {
  73         return fgets(line, size, stdin)? 1 : -1;
  74 }
  75
  76 static int icom_run(__a_unused char *line)
  77 {
  78         return run_select_query(admissible_uids, fi);
  79 }
  80
  81 static int icom_help(__a_unused char *line)
  82 {
  83         struct interactive_command *c;
  84
  85         FOR_EACH_COMMAND(c)
  86                 fprintf(stdout, "%s\t%s\n", c->name, c->desc);
  87         return 1;
  88 }
  89
  90 /**
  91  * Print the list of commands with short descriptions.
  92  */
  93 void print_interactive_help(void)
  94 {
  95         struct interactive_command *c;
  96         FOR_EACH_COMMAND(c)
  97                 fprintf(stdout, "\t%s\t%s\n", c->name, c->desc);
  98 }
  99
 100 static int icom_reset(__a_unused char *line)
 101 {
 102         NOTICE_LOG("resetting configuration to default\n");
 103         free_format_info(fi);
 104         fi = NULL;
 105         free(admissible_uids);
 106         admissible_uids = NULL;
 107         select_cmdline_parser_init(&select_conf);
 108         return parse_select_options(NULL, NULL, &admissible_uids, &fi);
 109 }
 110
 111 static int icom_set(char *line)
 112 {
 113         int ret;
 114         struct select_cmdline_parser_params params = {
 115                 .override = 1,
 116                 .initialize = 0,
 117                 .check_required = 1,
 118                 .check_ambiguity = 0,
 119                 .print_errors = 1
 120         };
 121         if (!line) {
 122                 select_cmdline_parser_dump(stdout, &select_conf);
 123                 return 1;
 124         }
 125
 126         free_format_info(fi);
 127         fi = NULL;
 128         free(admissible_uids);
 129         admissible_uids = NULL;
 130         ret = parse_select_options(line, &params, &admissible_uids, &fi);
 131         if (ret >= 0)
 132                 return ret;
 133         return icom_reset(NULL);
 134 }
 135
 136 static int exec_interactive_command(char *line)
 137 {
 138         const char const *delim = "\t\n\f\r\v ";
 139         int i;
 140         char *cmd, *args;
 141         int ret = -E_SYNTAX;
 142         size_t len;
 143
 144         if (!line || !*line)
 145                 return 1;
 146         len = strlen(line);
 147
 148         while (len && isspace(line[len - 1])) {
 149                 line[len - 1] = '\0';
 150                 len--;
 151         }
 152         if (!len)
 153                 return 1;
 154         line += strspn(line, delim); /* skip initial whitespace */
 155         if (!*line)
 156                 return 1;
 157         /* OK, we have a non-empty line */
 158         if (*line == '#')
 159                 return 1;
 160         cmd = adu_strdup(line);
 161         args = cmd + strcspn(cmd, delim);
 162         if (!*args)
 163                 args = NULL;
 164         else {
 165                 *args = '\0';
 166                 args++;
 167                 /* let args point to the next non-whitespace char */
 168                 args += strspn(args, delim);
 169                 if (!*args)
 170                         args = NULL;
 171         }
 172         DEBUG_LOG("name: %s, args: %s.\n", cmd, args);
 173         for (i = 0; icmds[i].name; i++) {
 174                 if (strcmp(icmds[i].name, cmd))
 175                         continue;
 176                 INFO_LOG("exec cmd: %s, args: %s\n", cmd, args);
 177                 ret = icmds[i].handler(args);
 178                 break;
 179         }
 180         free(cmd);
 181         return ret;
 182 }
 183
 184 static int icom_source(char *args)
 185 {
 186         char line[255];
 187         FILE *src = fopen(args, "r");
 188         int ret;
 189
 190         if (!src)
 191                 return -ERRNO_TO_ERROR(errno);
 192         while (fgets(line, sizeof(line), src)) {
 193                 ret = exec_interactive_command(line);
 194                 if (ret < 0)
 195                         goto out;
 196         }
 197         ret = 1;
 198 out:
 199         fclose(src);
 200         return ret;
 201 }
 202
 203 /**
 204  * The main function for interactive mode.
 205  *
 206  * \return Standard.
 207  */
 208 int com_interactive(void)
 209 {
 210         char line[255];
 211         int ret = 1;
 212
 213         select_cmdline_parser_init(&select_conf);
 214         ret = parse_select_options(NULL, NULL, &admissible_uids, &fi);
 215         if (ret< 0)
 216                 return ret;
 217         ret = read_uid_file(conf.database_dir_arg);
 218         if (ret < 0)
 219                 return ret;
 220         while (read_input_line(line, sizeof(line)) >= 0) {
 221                 ret = exec_interactive_command(line);
 222                 if (ret < 0)
 223                         printf("%s\n", adu_strerror(-ret));
 224         }
 225         return ret;
 226 }