nbd-tester-client.c

   1 /*
   2  * Test client to test the NBD server. Doesn't do anything useful, except
   3  * checking that the server does, actually, work.
   4  *
   5  * Note that the only 'real' test is to check the client against a kernel. If
   6  * it works here but does not work in the kernel, then that's most likely a bug
   7  * in this program and/or in nbd-server.
   8  *
   9  * Copyright(c) 2006  Wouter Verhelst
  10  *
  11  * This program is Free Software; you can redistribute it and/or modify it
  12  * under the terms of the GNU General Public License as published by the Free
  13  * Software Foundation, in version 2.
  14  *
  15  * This program is distributed in the hope that it will be useful, but WITHOUT
  16  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  17  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  18  * more details.
  19  *
  20  * You should have received a copy of the GNU General Public License along with
  21  * this program; if not, write to the Free Software Foundation, Inc., 51
  22  * Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  23  */
  24 #include <stdlib.h>
  25 #include <stdio.h>
  26 #include <string.h>
  27 #include <glib.h>
  28 #include <sys/time.h>
  29 #include <sys/types.h>
  30 #include <sys/types.h>
  31 #include <sys/socket.h>
  32 #include <syslog.h>
  33 #include <unistd.h>
  34 #include "config.h"
  35 #include "lfs.h"
  36 #define MY_NAME "nbd-tester-client"
  37 #include "cliserv.h"
  38
  39 static gchar errstr[1024];
  40 const static int errstr_len=1024;
  41
  42 typedef enum {
  43         CONNECTION_TYPE_NONE,
  44         CONNECTION_TYPE_CONNECT,
  45         CONNECTION_TYPE_INIT_PASSWD,
  46         CONNECTION_TYPE_CLISERV,
  47         CONNECTION_TYPE_FULL,
  48 } CONNECTION_TYPE;
  49
  50 typedef enum {
  51         CONNECTION_CLOSE_PROPERLY,
  52         CONNECTION_CLOSE_FAST,
  53 } CLOSE_TYPE;
  54
  55 inline int read_all(int f, void *buf, size_t len) {
  56         ssize_t res;
  57         size_t retval=0;
  58
  59         while(len>0) {
  60                 if((res=read(f, buf, len)) <=0) {
  61                         snprintf(errstr, errstr_len, "Read failed: %s", strerror(errno));
  62                         return -1;
  63                 }
  64                 len-=res;
  65                 buf+=res;
  66                 retval+=res;
  67         }
  68         return retval;
  69 }
  70
  71 int setup_connection(gchar *hostname, int port, CONNECTION_TYPE ctype) {
  72         int sock;
  73         struct hostent *host;
  74         struct sockaddr_in addr;
  75         char buf[256];
  76         u64 tmp64;
  77
  78         sock=0;
  79         if(ctype<CONNECTION_TYPE_CONNECT)
  80                 goto end;
  81         if((sock=socket(PF_INET, SOCK_STREAM, IPPROTO_TCP))<0) {
  82                 strncpy(errstr, strerror(errno), errstr_len);
  83                 goto err;
  84         }
  85         setmysockopt(sock);
  86         if(!(host=gethostbyname(hostname))) {
  87                 strncpy(errstr, strerror(errno), errstr_len);
  88                 goto err_open;
  89         }
  90         addr.sin_family=AF_INET;
  91         addr.sin_port=htons(port);
  92         addr.sin_addr.s_addr=*((int *) host->h_addr);
  93         if((connect(sock, (struct sockaddr *)&addr, sizeof(addr))<0)) {
  94                 strncpy(errstr, strerror(errno), errstr_len);
  95                 goto err_open;
  96         }
  97         if(ctype<CONNECTION_TYPE_INIT_PASSWD)
  98                 goto end;
  99         if(read_all(sock, buf, strlen(INIT_PASSWD))<0) {
 100                 snprintf(errstr, errstr_len, "Could not read INIT_PASSWD: %s",
 101                                 strerror(errno));
 102                 goto err_open;
 103         }
 104         if(strlen(buf)==0) {
 105                 snprintf(errstr, errstr_len, "Server closed connection");
 106                 goto err_open;
 107         }
 108         if(strncmp(buf, INIT_PASSWD, strlen(INIT_PASSWD))) {
 109                 snprintf(errstr, errstr_len, "INIT_PASSWD does not match");
 110                 goto err_open;
 111         }
 112         if(ctype<CONNECTION_TYPE_CLISERV)
 113                 goto end;
 114         if(read_all(sock, &tmp64, sizeof(tmp64))<0) {
 115                 snprintf(errstr, errstr_len, "Could not read cliserv_magic: %s",
 116                                 strerror(errno));
 117                 goto err_open;
 118         }
 119         tmp64=ntohll(tmp64);
 120         if(tmp64 != cliserv_magic) {
 121                 strncpy(errstr, "cliserv_magic does not match", errstr_len);
 122                 goto err_open;
 123         }
 124         if(ctype<CONNECTION_TYPE_FULL)
 125                 goto end;
 126         /* The information we get now contains information on sizes. If
 127          * we're here, that means we want a 'working' connection, but
 128          * we're not interested in the sizes. So, read them but throw
 129          * the values away. We need to read the size of the device (a
 130          * 64bit integer) plus the reserved fields (128 bytes; should
 131          * all be zeroes).
 132          */
 133         read_all(sock, buf, sizeof(tmp64)+128);
 134         goto end;
 135 err_open:
 136         close(sock);
 137 err:
 138         sock=-1;
 139 end:
 140         return sock;
 141 }
 142
 143 int close_connection(int sock, CLOSE_TYPE type) {
 144         struct nbd_request req;
 145         u64 counter=0;
 146
 147         switch(type) {
 148                 case CONNECTION_CLOSE_PROPERLY:
 149                         req.magic=htonl(NBD_REQUEST_MAGIC);
 150                         req.type=htonl(NBD_CMD_DISC);
 151                         memcpy(&(req.handle), &(counter), sizeof(counter));
 152                         counter++;
 153                         req.from=0;
 154                         req.len=0;
 155                         if(write(sock, &req, sizeof(req))<0) {
 156                                 snprintf(errstr, errstr_len, "Could not write to socket: %s", strerror(errno));
 157                                 return -1;
 158                         }
 159                 case CONNECTION_CLOSE_FAST:
 160                         if(close(sock)<0) {
 161                                 snprintf(errstr, errstr_len, "Could not close socket: %s", strerror(errno));
 162                                 return -1;
 163                         }
 164                         break;
 165                 default:
 166                         g_critical("Your compiler is on crack!"); /* or I am buggy */
 167                         return -1;
 168         }
 169         return 0;
 170 }
 171
 172 int read_packet_check_header(int sock, size_t datasize, long long int curhandle) {
 173         struct nbd_reply rep;
 174         int retval=0;
 175         char buf[datasize];
 176
 177         read_all(sock, &rep, sizeof(rep));
 178         rep.magic=ntohl(rep.magic);
 179         rep.error=ntohl(rep.error);
 180         if(rep.magic!=NBD_REPLY_MAGIC) {
 181                 snprintf(errstr, errstr_len, "Received package with incorrect reply_magic. Index of sent packages is %lld (0x%llX), received handle is %lld (0x%llX). Received magic 0x%lX, expected 0x%lX", curhandle, curhandle, *((u64*)rep.handle), *((u64*)rep.handle), rep.magic, NBD_REPLY_MAGIC);
 182                 retval=-1;
 183                 goto end;
 184         }
 185         if(rep.error) {
 186                 snprintf(errstr, errstr_len, "Received error from server: %ld (0x%lX). Handle is %lld (0x%llX).", rep.error, *((u64*)rep.handle), *((u64*)rep.handle));
 187                 retval=-1;
 188                 goto end;
 189         }
 190         read_all(sock, &buf, datasize);
 191
 192 end:
 193         return retval;
 194 }
 195
 196 int throughput_test(gchar* hostname, int port, int sock, char sock_is_open, char close_sock) {
 197         long long int i;
 198         char buf[1024];
 199         struct nbd_request req;
 200         u64 size;
 201         int requests=0;
 202         fd_set set;
 203         struct timeval tv;
 204         int retval=0;
 205         size_t tmp;
 206         signed int do_write=TRUE;
 207
 208         if(!sock_is_open) {
 209                 if((sock=setup_connection(hostname, port, CONNECTION_TYPE_CLISERV))<0) {
 210                         g_warning("Could not open socket: %s", errstr);
 211                         retval=-1;
 212                         goto err;
 213                 }
 214         } else {
 215                 /* Assume the file is at least 4k in size. Not much of a test
 216                  * this way, but, well. */
 217                 size=4096;
 218         }
 219         size=0;
 220         if((tmp=read_all(sock, &size, sizeof(u64)))<0) {
 221                 retval=-1;
 222                 snprintf(errstr, errstr_len, "Could not read from socket: %s", strerror(errno));
 223                 goto err_open;
 224         }
 225         if(tmp==0) {
 226                 retval=-1;
 227                 snprintf(errstr, errstr_len, "Server closed connection unexpectedly when trying to read size of device in throughput test");
 228                 goto err;
 229         }
 230         read_all(sock,&buf,128);
 231         size=ntohll(size);
 232         req.magic=htonl(NBD_REQUEST_MAGIC);
 233         req.type=htonl(NBD_CMD_READ);
 234         req.len=htonl(1024);
 235         for(i=0;i+1024<=size;i+=1024) {
 236                 if(do_write) {
 237                         *((u64*)req.handle)=i;
 238                         req.from=htonll(i);
 239                         write(sock, &req, sizeof(req));
 240                         printf("Requests(+): %d\n", ++requests);
 241                 }
 242                 do {
 243                         FD_ZERO(&set);
 244                         FD_SET(sock, &set);
 245                         tv.tv_sec=0;
 246                         tv.tv_usec=0;
 247                         select(sock+1, &set, NULL, NULL, &tv);
 248                         if(FD_ISSET(sock, &set)) {
 249                                 /* Okay, there's something ready for
 250                                  * reading here */
 251                                 if(read_packet_check_header(sock, 1024, i)<0) {
 252                                         retval=-1;
 253                                         goto err_open;
 254                                 }
 255                                 printf("Requests(-): %d\n", --requests);
 256                         }
 257                 } while FD_ISSET(sock, &set);
 258                 /* Now wait until we can write again or until a second have
 259                  * passed, whichever comes first*/
 260                 FD_ZERO(&set);
 261                 FD_SET(sock, &set);
 262                 tv.tv_sec=1;
 263                 tv.tv_usec=0;
 264                 do_write=select(sock+1,NULL,&set,NULL,&tv);
 265                 if(!do_write) printf("Select finished\n");
 266                 if(do_write<0) {
 267                         snprintf(errstr, errstr_len, "select: %s", strerror(errno));
 268                         retval=-1;
 269                         goto err_open;
 270                 }
 271         }
 272         /* Now empty the read buffer */
 273         do {
 274                 FD_ZERO(&set);
 275                 FD_SET(sock, &set);
 276                 tv.tv_sec=0;
 277                 tv.tv_usec=0;
 278                 select(sock+1, &set, NULL, NULL, &tv);
 279                 if(FD_ISSET(sock, &set)) {
 280                         /* Okay, there's something ready for
 281                          * reading here */
 282                         read_packet_check_header(sock, 1024, i);
 283                         printf("Requests(-): %d\n", --requests);
 284                 }
 285         } while (requests);
 286
 287 err_open:
 288         if(close_sock) {
 289                 close_connection(sock, CONNECTION_CLOSE_PROPERLY);
 290         }
 291 err:
 292         return retval;
 293 }
 294
 295 int main(int argc, char**argv) {
 296         gchar *hostname;
 297         long int p;
 298         int port;
 299         int sock;
 300
 301         if(argc<3) {
 302                 g_message("Not enough arguments");
 303                 g_message("Usage: %s <hostname> <port>", argv[0]);
 304                 exit(EXIT_FAILURE);
 305         }
 306         logging();
 307         hostname=g_strdup(argv[1]);
 308         p=(strtol(argv[2], NULL, 0));
 309         if(p==LONG_MIN||p==LONG_MAX) {
 310                 g_critical("Could not parse port number: %s", strerror(errno));
 311                 exit(EXIT_FAILURE);
 312         }
 313         port=(int)p;
 314
 315         if(throughput_test(hostname, port, sock, FALSE, TRUE)<0) {
 316                 g_warning("Could not run throughput test: %s", errstr);
 317                 exit(EXIT_FAILURE);
 318         }
 319
 320         return 0;
 321 }