src/tools/sysdb/main.c

   1 /*
   2  * SysDB - src/tools/sysdb/main.c
   3  * Copyright (C) 2013 Sebastian 'tokkee' Harl <sh@tokkee.org>
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  16  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  17  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  18  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
  19  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  20  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #if HAVE_CONFIG_H
  29 #       include "config.h"
  30 #endif /* HAVE_CONFIG_H */
  31
  32 #include "tools/sysdb/command.h"
  33 #include "tools/sysdb/input.h"
  34
  35 #include "client/sysdb.h"
  36 #include "client/sock.h"
  37 #include "utils/error.h"
  38 #include "utils/llist.h"
  39 #include "utils/strbuf.h"
  40
  41 #include <errno.h>
  42
  43 #if HAVE_LIBGEN_H
  44 #       include <libgen.h>
  45 #else /* HAVE_LIBGEN_H */
  46 #       define basename(path) (path)
  47 #endif /* ! HAVE_LIBGEN_H */
  48
  49 #include <sys/stat.h>
  50 #include <fcntl.h>
  51
  52 #include <stdio.h>
  53 #include <stdlib.h>
  54 #include <string.h>
  55
  56 #include <unistd.h>
  57
  58 #include <sys/types.h>
  59
  60 #include <pwd.h>
  61
  62 #if HAVE_EDITLINE_READLINE_H
  63 #       include <editline/readline.h>
  64 #       if HAVE_EDITLINE_HISTORY_H
  65 #               include <editline/history.h>
  66 #       endif
  67 #elif HAVE_READLINE_READLINE_H
  68 #       include <readline/readline.h>
  69 #       if HAVE_READLINE_HISTORY_H
  70 #               include <readline/history.h>
  71 #       endif
  72 #elif HAVE_READLINE_H
  73 #       include <readline.h>
  74 #       if HAVE_HISTORY_H
  75 #               include <history.h>
  76 #       endif
  77 #endif /* READLINEs */
  78
  79 #ifndef DEFAULT_SOCKET
  80 #       define DEFAULT_SOCKET "unix:"LOCALSTATEDIR"/run/sysdbd.sock"
  81 #endif
  82
  83 static const char *
  84 get_current_user(void)
  85 {
  86         struct passwd pw_entry;
  87         struct passwd *result = NULL;
  88
  89         uid_t uid;
  90
  91         /* needs to be static because we return a pointer into this buffer
  92          * to the caller */
  93         static char buf[1024];
  94
  95         int status;
  96
  97         uid = geteuid();
  98
  99         memset(&pw_entry, 0, sizeof(pw_entry));
 100         status = getpwuid_r(uid, &pw_entry, buf, sizeof(buf), &result);
 101
 102         if (status || (! result)) {
 103                 char errbuf[1024];
 104                 sdb_log(SDB_LOG_ERR, "Failed to determine current username: %s",
 105                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 106                 return NULL;
 107         }
 108         return result->pw_name;
 109 } /* get_current_user */
 110
 111 static const char *
 112 get_homedir(const char *username)
 113 {
 114         struct passwd pw_entry;
 115         struct passwd *result = NULL;
 116
 117         /* needs to be static because we return a pointer into this buffer
 118          * to the caller */
 119         static char buf[1024];
 120
 121         int status;
 122
 123         memset(&pw_entry, 0, sizeof(pw_entry));
 124         status = getpwnam_r(username, &pw_entry, buf, sizeof(buf), &result);
 125
 126         if (status || (! result)) {
 127                 char errbuf[1024];
 128                 sdb_log(SDB_LOG_WARNING, "Failed to determine home directory "
 129                                 "for user %s: %s", username,
 130                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 131                 return NULL;
 132         }
 133         return result->pw_dir;
 134 } /* get_homedir */
 135
 136 static void
 137 exit_usage(char *name, int status)
 138 {
 139         printf(
 140 "Usage: %s <options>\n"
 141
 142 "\nOptions:\n"
 143 "  -H HOST   the host to connect to\n"
 144 "            default: "DEFAULT_SOCKET"\n"
 145 "  -U USER   the username to connect as\n"
 146 "            default: %s\n"
 147 "  -c CMD    execute the specified command and then exit\n"
 148 "\n"
 149 "  -h        display this help and exit\n"
 150 "  -V        display the version number and copyright\n"
 151
 152 "\nSysDB client "SDB_CLIENT_VERSION_STRING SDB_CLIENT_VERSION_EXTRA", "
 153 PACKAGE_URL"\n", basename(name), get_current_user());
 154         exit(status);
 155 } /* exit_usage */
 156
 157 static void
 158 exit_version(void)
 159 {
 160         printf("SysDB version "SDB_CLIENT_VERSION_STRING
 161                         SDB_CLIENT_VERSION_EXTRA", built "BUILD_DATE"\n"
 162                         "using libsysdbclient version %s%s\n"
 163                         "Copyright (C) 2012-2014 "PACKAGE_MAINTAINER"\n"
 164
 165                         "\nThis is free software under the terms of the BSD license, see "
 166                         "the source for\ncopying conditions. There is NO WARRANTY; not "
 167                         "even for MERCHANTABILITY or\nFITNESS FOR A PARTICULAR "
 168                         "PURPOSE.\n", sdb_client_version_string(),
 169                         sdb_client_version_extra());
 170         exit(0);
 171 } /* exit_version */
 172
 173 static int
 174 execute_commands(sdb_client_t *client, sdb_llist_t *commands)
 175 {
 176         sdb_llist_iter_t *iter;
 177         int status = 0;
 178
 179         iter = sdb_llist_get_iter(commands);
 180         if (! iter) {
 181                 sdb_log(SDB_LOG_ERR, "Failed to iterate commands");
 182                 return 1;
 183         }
 184
 185         while (sdb_llist_iter_has_next(iter)) {
 186                 sdb_object_t *obj = sdb_llist_iter_get_next(iter);
 187
 188                 if (sdb_client_send(client, SDB_CONNECTION_QUERY,
 189                                         (uint32_t)strlen(obj->name), obj->name) <= 0) {
 190                         sdb_log(SDB_LOG_ERR, "Failed to send command '%s' to server",
 191                                         obj->name);
 192                         status = 1;
 193                         break;
 194                 }
 195
 196                 /* Wait for server replies. We might get any number of log messages
 197                  * but eventually see the reply to the query, which is either DATA or
 198                  * ERROR. */
 199                 while (42) {
 200                         status = sdb_command_print_reply(client);
 201                         if (status < 0) {
 202                                 sdb_log(SDB_LOG_ERR, "Failed to read reply from server");
 203                                 break;
 204                         }
 205
 206                         if ((status == SDB_CONNECTION_DATA)
 207                                         || (status == SDB_CONNECTION_ERROR))
 208                                 break;
 209                         if (status == SDB_CONNECTION_OK) {
 210                                 /* pre 0.4 versions used OK instead of DATA */
 211                                 sdb_log(SDB_LOG_WARNING, "Received unexpected OK status from "
 212                                                 "server in response to a QUERY (expected DATA); "
 213                                                 "assuming we're talking to an old server");
 214                                 break;
 215                         }
 216                 }
 217
 218                 if ((status != SDB_CONNECTION_OK) && (status != SDB_CONNECTION_DATA))
 219                         break; /* error */
 220         }
 221
 222         sdb_llist_iter_destroy(iter);
 223         return status;
 224 } /* execute_commands */
 225
 226 int
 227 main(int argc, char **argv)
 228 {
 229         const char *host = NULL;
 230         const char *user = NULL;
 231
 232         const char *homedir;
 233         char hist_file[1024] = "";
 234
 235         sdb_input_t input = SDB_INPUT_INIT;
 236         sdb_llist_t *commands = NULL;
 237
 238         while (42) {
 239                 int opt = getopt(argc, argv, "H:U:c:hV");
 240
 241                 if (-1 == opt)
 242                         break;
 243
 244                 switch (opt) {
 245                         case 'H':
 246                                 host = optarg;
 247                                 break;
 248                         case 'U':
 249                                 user = optarg;
 250                                 break;
 251
 252                         case 'c':
 253                                 {
 254                                         sdb_object_t *obj;
 255
 256                                         if (! commands)
 257                                                 commands = sdb_llist_create();
 258                                         if (! commands) {
 259                                                 sdb_log(SDB_LOG_ERR, "Failed to create list object");
 260                                                 exit(1);
 261                                         }
 262
 263                                         if (! (obj = sdb_object_create_T(optarg, sdb_object_t))) {
 264                                                 sdb_log(SDB_LOG_ERR, "Failed to create object");
 265                                                 exit(1);
 266                                         }
 267                                         if (sdb_llist_append(commands, obj)) {
 268                                                 sdb_log(SDB_LOG_ERR, "Failed to append command to list");
 269                                                 sdb_object_deref(obj);
 270                                                 exit(1);
 271                                         }
 272                                         sdb_object_deref(obj);
 273                                 }
 274                                 break;
 275
 276                         case 'h':
 277                                 exit_usage(argv[0], 0);
 278                                 break;
 279                         case 'V':
 280                                 exit_version();
 281                                 break;
 282                         default:
 283                                 exit_usage(argv[0], 1);
 284                 }
 285         }
 286
 287         if (optind < argc)
 288                 exit_usage(argv[0], 1);
 289
 290         if (! host)
 291                 host = DEFAULT_SOCKET;
 292         if (! user) {
 293                 user = get_current_user();
 294                 if (! user)
 295                         exit(1);
 296         }
 297
 298         input.client = sdb_client_create(host);
 299         if (! input.client) {
 300                 sdb_log(SDB_LOG_ERR, "Failed to create client object");
 301                 exit(1);
 302         }
 303         if (sdb_client_connect(input.client, user)) {
 304                 sdb_log(SDB_LOG_ERR, "Failed to connect to SysDBd");
 305                 sdb_client_destroy(input.client);
 306                 exit(1);
 307         }
 308
 309         if (commands) {
 310                 int status = execute_commands(input.client, commands);
 311                 sdb_llist_destroy(commands);
 312                 sdb_client_destroy(input.client);
 313                 if ((status != SDB_CONNECTION_OK) && (status != SDB_CONNECTION_DATA))
 314                         exit(1);
 315                 exit(0);
 316         }
 317
 318         sdb_log(SDB_LOG_INFO, "SysDB client "SDB_CLIENT_VERSION_STRING
 319                         SDB_CLIENT_VERSION_EXTRA" (libsysdbclient %s%s)\n",
 320                         sdb_client_version_string(), sdb_client_version_extra());
 321
 322         using_history();
 323
 324         if ((homedir = get_homedir(user))) {
 325                 snprintf(hist_file, sizeof(hist_file) - 1,
 326                                 "%s/.sysdb_history", homedir);
 327                 hist_file[sizeof(hist_file) - 1] = '\0';
 328
 329                 errno = 0;
 330                 if (read_history(hist_file) && (errno != ENOENT)) {
 331                         char errbuf[1024];
 332                         sdb_log(SDB_LOG_WARNING, "Failed to load history (%s): %s",
 333                                         hist_file, sdb_strerror(errno, errbuf, sizeof(errbuf)));
 334                 }
 335         }
 336
 337         input.input = sdb_strbuf_create(2048);
 338         sdb_input_init(&input);
 339         sdb_input_mainloop();
 340
 341         sdb_client_shutdown(input.client, SHUT_WR);
 342         while (! sdb_client_eof(input.client)) {
 343                 /* wait for remaining data to arrive */
 344                 sdb_command_print_reply(input.client);
 345         }
 346
 347         if (hist_file[0] != '\0') {
 348                 errno = 0;
 349                 if (write_history(hist_file)) {
 350                         char errbuf[1024];
 351                         sdb_log(SDB_LOG_WARNING, "Failed to store history (%s): %s",
 352                                         hist_file, sdb_strerror(errno, errbuf, sizeof(errbuf)));
 353                 }
 354         }
 355
 356         sdb_client_destroy(input.client);
 357         sdb_strbuf_destroy(input.input);
 358         return 0;
 359 } /* main */
 360
 361 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
 362