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