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