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/strbuf.h"
  30 #include "utils/proto.h"
  31
  32 #include <arpa/inet.h>
  33
  34 #include <errno.h>
  35 #include <limits.h>
  36
  37 #include <stdlib.h>
  38
  39 #include <string.h>
  40 #include <strings.h>
  41
  42 #include <unistd.h>
  43
  44 #include <sys/socket.h>
  45 #include <sys/un.h>
  46
  47 /*
  48  * private data types
  49  */
  50
  51 struct sdb_client {
  52         char *address;
  53         int   fd;
  54 };
  55
  56 /*
  57  * private helper functions
  58  */
  59
  60 static int
  61 connect_unixsock(sdb_client_t *client, const char *address)
  62 {
  63         struct sockaddr_un sa;
  64
  65         client->fd = socket(AF_UNIX, SOCK_STREAM, /* protocol = */ 0);
  66         if (client->fd < 0)
  67                 return -1;
  68
  69         sa.sun_family = AF_UNIX;
  70         strncpy(sa.sun_path, address, sizeof(sa.sun_path));
  71         sa.sun_path[sizeof(sa.sun_path) - 1] = '\0';
  72
  73         if (connect(client->fd, (struct sockaddr *)&sa, sizeof(sa))) {
  74                 sdb_client_close(client);
  75                 return -1;
  76         }
  77         return client->fd;
  78 } /* connect_unixsock */
  79
  80 /*
  81  * public API
  82  */
  83
  84 sdb_client_t *
  85 sdb_client_create(const char *address)
  86 {
  87         sdb_client_t *client;
  88
  89         if (! address)
  90                 return NULL;
  91
  92         client = malloc(sizeof(*client));
  93         if (! client)
  94                 return NULL;
  95         memset(client, 0, sizeof(*client));
  96         client->fd = -1;
  97
  98         client->address = strdup(address);
  99         if (! client->address) {
 100                 sdb_client_destroy(client);
 101                 return NULL;
 102         }
 103
 104         return client;
 105 } /* sdb_client_create */
 106
 107 void
 108 sdb_client_destroy(sdb_client_t *client)
 109 {
 110         if (! client)
 111                 return;
 112
 113         sdb_client_close(client);
 114
 115         if (client->address)
 116                 free(client->address);
 117         client->address = NULL;
 118
 119         free(client);
 120 } /* sdb_client_destroy */
 121
 122 int
 123 sdb_client_connect(sdb_client_t *client)
 124 {
 125         if ((! client) || (! client->address))
 126                 return -1;
 127
 128         if (client->fd >= 0)
 129                 return -1;
 130
 131         if (!strncasecmp(client->address, "unix:", strlen("unix:")))
 132                 connect_unixsock(client, client->address + strlen("unix:"));
 133         else if (*client->address == '/')
 134                 connect_unixsock(client, client->address);
 135         else
 136                 return -1;
 137
 138         if (client->fd < 0)
 139                 return -1;
 140         return 0;
 141 } /* sdb_client_connect */
 142
 143 void
 144 sdb_client_close(sdb_client_t *client)
 145 {
 146         if (! client)
 147                 return;
 148
 149         close(client->fd);
 150         client->fd = -1;
 151 } /* sdb_client_close */
 152
 153 ssize_t
 154 sdb_client_send(sdb_client_t *client,
 155                 uint32_t cmd, uint32_t msg_len, const char *msg)
 156 {
 157         if ((! client) || (! client->fd))
 158                 return -1;
 159
 160         return sdb_proto_send_msg(client->fd, cmd, msg_len, msg);
 161 } /* sdb_client_send */
 162
 163 ssize_t
 164 sdb_client_recv(sdb_client_t *client,
 165                 uint32_t *code, sdb_strbuf_t *buf)
 166 {
 167         uint32_t rstatus = UINT32_MAX;
 168         uint32_t rlen = UINT32_MAX;
 169
 170         size_t total = 0;
 171         size_t req = 2 * sizeof(uint32_t);
 172
 173         size_t data_offset = sdb_strbuf_len(buf);
 174
 175         if ((! client) || (! client->fd) || (! buf)) {
 176                 errno = EBADF;
 177                 return -1;
 178         }
 179
 180         if (code)
 181                 *code = UINT32_MAX;
 182
 183         while (42) {
 184                 ssize_t status;
 185
 186                 /* XXX: use select */
 187
 188                 errno = 0;
 189                 status = sdb_strbuf_read(buf, client->fd, req);
 190                 if (status < 0) {
 191                         if ((errno == EAGAIN) || (errno == EWOULDBLOCK))
 192                                 continue;
 193                         return status;
 194                 }
 195                 else if (! status) /* EOF */
 196                         break;
 197
 198                 total += (size_t)status;
 199
 200                 if (total != req)
 201                         continue;
 202
 203                 if (rstatus == UINT32_MAX) {
 204                         /* retrieve status and data len */
 205                         rstatus = sdb_proto_get_int(buf, data_offset);
 206                         rlen = sdb_proto_get_int(buf, data_offset + sizeof(rstatus));
 207
 208                         if (! rlen)
 209                                 break;
 210
 211                         req = (size_t)rlen;
 212                         total = 0;
 213                 }
 214                 else /* finished reading data */
 215                         break;
 216         }
 217
 218         if (total != req) {
 219                 /* unexpected EOF; clear partially read data */
 220                 sdb_strbuf_skip(buf, data_offset, sdb_strbuf_len(buf));
 221                 return 0;
 222         }
 223
 224         if (rstatus != UINT32_MAX)
 225                 /* remove status,len */
 226                 sdb_strbuf_skip(buf, data_offset, 2 * sizeof(rstatus));
 227
 228         if (code)
 229                 *code = rstatus;
 230
 231         return (ssize_t)total;
 232 } /* sdb_client_recv */
 233
 234 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
 235