src/client/sock.c

   1 /*
   2  * SysDB - src/client/sock.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 #include "client/sock.h"
  29 #include "utils/error.h"
  30 #include "utils/strbuf.h"
  31 #include "utils/proto.h"
  32
  33 #include <arpa/inet.h>
  34
  35 #include <errno.h>
  36 #include <limits.h>
  37
  38 #include <stdlib.h>
  39
  40 #include <string.h>
  41 #include <strings.h>
  42
  43 #include <unistd.h>
  44
  45 #include <sys/socket.h>
  46 #include <sys/un.h>
  47
  48 /*
  49  * private data types
  50  */
  51
  52 struct sdb_client {
  53         char *address;
  54         int   fd;
  55         _Bool eof;
  56 };
  57
  58 /*
  59  * private helper functions
  60  */
  61
  62 static int
  63 connect_unixsock(sdb_client_t *client, const char *address)
  64 {
  65         struct sockaddr_un sa;
  66
  67         client->fd = socket(AF_UNIX, SOCK_STREAM, /* protocol = */ 0);
  68         if (client->fd < 0) {
  69                 char errbuf[1024];
  70                 sdb_log(SDB_LOG_ERR, "Failed to open socket: %s",
  71                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
  72                 return -1;
  73         }
  74
  75         sa.sun_family = AF_UNIX;
  76         strncpy(sa.sun_path, address, sizeof(sa.sun_path));
  77         sa.sun_path[sizeof(sa.sun_path) - 1] = '\0';
  78
  79         if (connect(client->fd, (struct sockaddr *)&sa, sizeof(sa))) {
  80                 char errbuf[1024];
  81                 sdb_client_close(client);
  82                 sdb_log(SDB_LOG_ERR, "Failed to connect to '%s': %s",
  83                                 sa.sun_path, sdb_strerror(errno, errbuf, sizeof(errbuf)));
  84                 return -1;
  85         }
  86         return client->fd;
  87 } /* connect_unixsock */
  88
  89 /*
  90  * public API
  91  */
  92
  93 sdb_client_t *
  94 sdb_client_create(const char *address)
  95 {
  96         sdb_client_t *client;
  97
  98         if (! address)
  99                 return NULL;
 100
 101         client = malloc(sizeof(*client));
 102         if (! client) {
 103                 sdb_log(SDB_LOG_ERR, "Out of memory");
 104                 return NULL;
 105         }
 106         memset(client, 0, sizeof(*client));
 107         client->fd = -1;
 108         client->eof = 1;
 109
 110         client->address = strdup(address);
 111         if (! client->address) {
 112                 sdb_client_destroy(client);
 113                 sdb_log(SDB_LOG_ERR, "Out of memory");
 114                 return NULL;
 115         }
 116
 117         return client;
 118 } /* sdb_client_create */
 119
 120 void
 121 sdb_client_destroy(sdb_client_t *client)
 122 {
 123         if (! client)
 124                 return;
 125
 126         sdb_client_close(client);
 127
 128         if (client->address)
 129                 free(client->address);
 130         client->address = NULL;
 131
 132         free(client);
 133 } /* sdb_client_destroy */
 134
 135 int
 136 sdb_client_connect(sdb_client_t *client, const char *username)
 137 {
 138         sdb_strbuf_t *buf;
 139         ssize_t status;
 140         uint32_t rstatus;
 141
 142         if ((! client) || (! client->address))
 143                 return -1;
 144
 145         if (client->fd >= 0)
 146                 return -1;
 147
 148         if (!strncasecmp(client->address, "unix:", strlen("unix:")))
 149                 connect_unixsock(client, client->address + strlen("unix:"));
 150         else if (*client->address == '/')
 151                 connect_unixsock(client, client->address);
 152         else {
 153                 sdb_log(SDB_LOG_ERR, "Unknown address type: %s", client->address);
 154                 return -1;
 155         }
 156
 157         if (client->fd < 0)
 158                 return -1;
 159         client->eof = 0;
 160
 161         /* XXX */
 162         if (! username)
 163                 username = "";
 164
 165         status = sdb_client_send(client, CONNECTION_STARTUP,
 166                         (uint32_t)strlen(username), username);
 167         if (status < 0) {
 168                 char errbuf[1024];
 169                 sdb_client_close(client);
 170                 sdb_log(SDB_LOG_ERR, "Failed to send STARTUP message to server: %s",
 171                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 172                 return (int)status;
 173         }
 174
 175         buf = sdb_strbuf_create(64);
 176         rstatus = 0;
 177         status = sdb_client_recv(client, &rstatus, buf);
 178         if ((status > 0) && (rstatus == CONNECTION_OK))
 179                 return 0;
 180
 181         if (status < 0) {
 182                 char errbuf[1024];
 183                 sdb_log(SDB_LOG_ERR, "Failed to receive server response: %s",
 184                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 185         }
 186         else if (client->eof)
 187                 sdb_log(SDB_LOG_ERR, "Encountered end-of-file while waiting "
 188                                 "for server response");
 189
 190         if (rstatus != CONNECTION_OK) {
 191                 sdb_log(SDB_LOG_ERR, "Access denied for user '%s'", username);
 192                 status = -((int)rstatus);
 193         }
 194
 195         sdb_client_close(client);
 196         sdb_strbuf_destroy(buf);
 197         return (int)status;
 198 } /* sdb_client_connect */
 199
 200 int
 201 sdb_client_sockfd(sdb_client_t *client)
 202 {
 203         if (! client)
 204                 return -1;
 205         return client->fd;
 206 } /* sdb_client_sockfd */
 207
 208 void
 209 sdb_client_close(sdb_client_t *client)
 210 {
 211         if (! client)
 212                 return;
 213
 214         close(client->fd);
 215         client->fd = -1;
 216         client->eof = 1;
 217 } /* sdb_client_close */
 218
 219 ssize_t
 220 sdb_client_send(sdb_client_t *client,
 221                 uint32_t cmd, uint32_t msg_len, const char *msg)
 222 {
 223         if ((! client) || (! client->fd))
 224                 return -1;
 225
 226         return sdb_proto_send_msg(client->fd, cmd, msg_len, msg);
 227 } /* sdb_client_send */
 228
 229 ssize_t
 230 sdb_client_recv(sdb_client_t *client,
 231                 uint32_t *code, sdb_strbuf_t *buf)
 232 {
 233         uint32_t rstatus = UINT32_MAX;
 234         uint32_t rlen = UINT32_MAX;
 235
 236         size_t total = 0;
 237         size_t req = 2 * sizeof(uint32_t);
 238
 239         size_t data_offset = sdb_strbuf_len(buf);
 240
 241         if (code)
 242                 *code = UINT32_MAX;
 243
 244         if ((! client) || (! client->fd) || (! buf)) {
 245                 errno = EBADF;
 246                 return -1;
 247         }
 248
 249         while (42) {
 250                 ssize_t status;
 251
 252                 if (sdb_proto_select(client->fd, SDB_PROTO_SELECTIN))
 253                         return -1;
 254
 255                 errno = 0;
 256                 status = sdb_strbuf_read(buf, client->fd, req);
 257                 if (status < 0) {
 258                         if ((errno == EAGAIN) || (errno == EWOULDBLOCK))
 259                                 continue;
 260                         return status;
 261                 }
 262                 else if (! status) {
 263                         client->eof = 1;
 264                         break;
 265                 }
 266
 267                 total += (size_t)status;
 268
 269                 if (total != req)
 270                         continue;
 271
 272                 if (rstatus == UINT32_MAX) {
 273                         /* retrieve status and data len */
 274                         rstatus = sdb_proto_get_int(buf, data_offset);
 275                         rlen = sdb_proto_get_int(buf, data_offset + sizeof(rstatus));
 276
 277                         if (! rlen)
 278                                 break;
 279
 280                         req = (size_t)rlen;
 281                         total = 0;
 282                 }
 283                 else /* finished reading data */
 284                         break;
 285         }
 286
 287         if (total != req) {
 288                 /* unexpected EOF; clear partially read data */
 289                 sdb_strbuf_skip(buf, data_offset, sdb_strbuf_len(buf));
 290                 return 0;
 291         }
 292
 293         if (rstatus != UINT32_MAX)
 294                 /* remove status,len */
 295                 sdb_strbuf_skip(buf, data_offset, 2 * sizeof(rstatus));
 296
 297         if (code)
 298                 *code = rstatus;
 299
 300         return (ssize_t)total;
 301 } /* sdb_client_recv */
 302
 303 _Bool
 304 sdb_client_eof(sdb_client_t *client)
 305 {
 306         if ((! client) || (client->fd < 0))
 307                 return 1;
 308         return client->eof;
 309 } /* sdb_client_eof */
 310
 311 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
 312