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