client.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <unistd.h>
   4 #include <limits.h>
   5 #include <errno.h>
   6 #include <fcntl.h>
   7 #include <sys/poll.h>
   8 #include <sys/types.h>
   9 #include <sys/stat.h>
  10 #include <sys/wait.h>
  11 #include <sys/mman.h>
  12 #include <netinet/in.h>
  13 #include <arpa/inet.h>
  14 #include <netdb.h>
  15
  16 #include "fio.h"
  17 #include "server.h"
  18 #include "crc/crc32.h"
  19 #include "flist.h"
  20
  21 struct fio_client {
  22         struct flist_head list;
  23         struct sockaddr_in addr;
  24         char *hostname;
  25         int fd;
  26 };
  27
  28 static FLIST_HEAD(client_list);
  29
  30 static struct fio_client *find_client_by_fd(int fd)
  31 {
  32         struct fio_client *client;
  33         struct flist_head *entry;
  34
  35         flist_for_each(entry, &client_list) {
  36                 client = flist_entry(entry, struct fio_client, list);
  37
  38                 if (client->fd == fd)
  39                         return client;
  40         }
  41
  42         return NULL;
  43 }
  44
  45 #if 0
  46 static struct fio_client *find_client_by_name(const char *name)
  47 {
  48         struct fio_client *client;
  49         struct flist_head *entry;
  50
  51         flist_for_each(entry, &client_list) {
  52                 client = flist_entry(entry, struct fio_client, list);
  53
  54                 if (!strcmp(name, client->hostname))
  55                         return client;
  56         }
  57
  58         return NULL;
  59 }
  60 #endif
  61
  62 static void remove_client(struct fio_client *client)
  63 {
  64         dprint(FD_NET, "removed client <%s>\n", client->hostname);
  65         flist_del(&client->list);
  66         nr_clients--;
  67         free(client->hostname);
  68         free(client);
  69 }
  70
  71 void fio_client_add(const char *hostname)
  72 {
  73         struct fio_client *client;
  74
  75         dprint(FD_NET, "added client <%s>\n", hostname);
  76         client = malloc(sizeof(*client));
  77         memset(client, 0, sizeof(*client));
  78         client->hostname = strdup(hostname);
  79         client->fd = -1;
  80         flist_add(&client->list, &client_list);
  81         nr_clients++;
  82 }
  83
  84 static int fio_client_connect(struct fio_client *client)
  85 {
  86         int fd;
  87
  88         dprint(FD_NET, "connect to host %s\n", client->hostname);
  89
  90         memset(&client->addr, 0, sizeof(client->addr));
  91         client->addr.sin_family = AF_INET;
  92         client->addr.sin_port = htons(fio_net_port);
  93
  94         if (inet_aton(client->hostname, &client->addr.sin_addr) != 1) {
  95                 struct hostent *hent;
  96
  97                 hent = gethostbyname(client->hostname);
  98                 if (!hent) {
  99                         log_err("fio: gethostbyname: %s\n", strerror(errno));
 100                         return 1;
 101                 }
 102
 103                 memcpy(&client->addr.sin_addr, hent->h_addr, 4);
 104         }
 105
 106         fd = socket(AF_INET, SOCK_STREAM, 0);
 107         if (fd < 0) {
 108                 log_err("fio: socket: %s\n", strerror(errno));
 109                 free(client);
 110                 return 1;
 111         }
 112
 113         if (connect(fd, (struct sockaddr *) &client->addr, sizeof(client->addr)) < 0) {
 114                 log_err("fio: connect: %s\n", strerror(errno));
 115                 free(client);
 116                 return 1;
 117         }
 118
 119         client->fd = fd;
 120         return 0;
 121 }
 122
 123 int fio_clients_connect(void)
 124 {
 125         struct fio_client *client;
 126         struct flist_head *entry, *tmp;
 127         int ret;
 128
 129         flist_for_each_safe(entry, tmp, &client_list) {
 130                 client = flist_entry(entry, struct fio_client, list);
 131
 132                 ret = fio_client_connect(client);
 133                 if (ret)
 134                         remove_client(client);
 135         }
 136
 137         return !nr_clients;
 138 }
 139
 140 static int send_file_buf(struct fio_client *client, char *buf, off_t size)
 141 {
 142         return fio_net_send_cmd(client->fd, FIO_NET_CMD_JOB, buf, size);
 143 }
 144
 145 /*
 146  * Send file contents to server backend. We could use sendfile(), but to remain
 147  * more portable lets just read/write the darn thing.
 148  */
 149 static int fio_client_send_ini(struct fio_client *client, const char *filename)
 150 {
 151         struct stat sb;
 152         char *p, *buf;
 153         off_t len;
 154         int fd, ret;
 155
 156         dprint(FD_NET, "send ini %s to %s\n", filename, client->hostname);
 157
 158         fd = open(filename, O_RDONLY);
 159         if (fd < 0) {
 160                 log_err("fio: job file open: %s\n", strerror(errno));
 161                 return 1;
 162         }
 163
 164         if (fstat(fd, &sb) < 0) {
 165                 log_err("fio: job file stat: %s\n", strerror(errno));
 166                 return 1;
 167         }
 168
 169         buf = malloc(sb.st_size);
 170
 171         len = sb.st_size;
 172         p = buf;
 173         do {
 174                 ret = read(fd, p, len);
 175                 if (ret > 0) {
 176                         len -= ret;
 177                         if (!len)
 178                                 break;
 179                         p += ret;
 180                         continue;
 181                 } else if (!ret)
 182                         break;
 183                 else if (errno == EAGAIN || errno == EINTR)
 184                         continue;
 185         } while (1);
 186
 187         ret = send_file_buf(client, buf, sb.st_size);
 188         free(buf);
 189         return ret;
 190 }
 191
 192 int fio_clients_send_ini(const char *filename)
 193 {
 194         struct fio_client *client;
 195         struct flist_head *entry, *tmp;
 196
 197         flist_for_each_safe(entry, tmp, &client_list) {
 198                 client = flist_entry(entry, struct fio_client, list);
 199
 200                 if (fio_client_send_ini(client, filename))
 201                         remove_client(client);
 202         }
 203
 204         return !nr_clients;
 205 }
 206
 207 static int handle_client(struct fio_client *client)
 208 {
 209         struct fio_net_cmd *cmd;
 210
 211         while ((cmd = fio_net_cmd_read(client->fd)) != NULL) {
 212                 dprint(FD_NET, "%s: got cmd op %d\n", client->hostname,
 213                                                         cmd->opcode);
 214
 215                 if (cmd->opcode == FIO_NET_CMD_ACK) {
 216                         free(cmd);
 217                         continue;
 218                 }
 219                 if (cmd->opcode == FIO_NET_CMD_QUIT) {
 220                         remove_client(client);
 221                         free(cmd);
 222                         break;
 223                 }
 224                 if (cmd->opcode != FIO_NET_CMD_TEXT) {
 225                         printf("non text: %d\n", cmd->opcode);
 226                         free(cmd);
 227                         continue;
 228                 }
 229                 fwrite(cmd->payload, cmd->pdu_len, 1, stdout);
 230                 fflush(stdout);
 231                 free(cmd);
 232         }
 233
 234         return 0;
 235 }
 236
 237 int fio_handle_clients(void)
 238 {
 239         struct fio_client *client;
 240         struct flist_head *entry;
 241         struct pollfd *pfds;
 242         int i, ret = 0;
 243
 244         pfds = malloc(nr_clients * sizeof(struct pollfd));
 245
 246         while (!exit_backend && nr_clients) {
 247                 i = 0;
 248                 flist_for_each(entry, &client_list) {
 249                         client = flist_entry(entry, struct fio_client, list);
 250
 251                         pfds[i].fd = client->fd;
 252                         pfds[i].events = POLLIN;
 253                         i++;
 254                 }
 255
 256                 assert(i == nr_clients);
 257
 258                 ret = poll(pfds, nr_clients, 100);
 259                 if (ret < 0) {
 260                         if (errno == EINTR)
 261                                 continue;
 262                         log_err("fio: poll clients: %s\n", strerror(errno));
 263                         break;
 264                 } else if (!ret)
 265                         continue;
 266
 267                 for (i = 0; i < nr_clients; i++) {
 268                         if (!(pfds[i].revents & POLLIN))
 269                                 continue;
 270
 271                         client = find_client_by_fd(pfds[i].fd);
 272                         if (!client) {
 273                                 log_err("fio: unknown client\n");
 274                                 continue;
 275                         }
 276                         handle_client(client);
 277                 }
 278         }
 279
 280         free(pfds);
 281
 282         return 0;
 283 }