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1 /* |
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2 * Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws> |
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3 * |
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4 * Network Block Device |
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5 * |
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6 * This program is free software; you can redistribute it and/or modify |
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7 * it under the terms of the GNU General Public License as published by |
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8 * the Free Software Foundation; under version 2 of the License. |
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9 * |
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10 * This program is distributed in the hope that it will be useful, |
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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13 * GNU General Public License for more details. |
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14 * |
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15 * You should have received a copy of the GNU General Public License |
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16 * along with this program; if not, write to the Free Software |
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17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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18 */ |
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19 |
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20 #include "nbd.h" |
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21 |
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22 #include <errno.h> |
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23 #include <string.h> |
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24 #ifndef _WIN32 |
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25 #include <sys/ioctl.h> |
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26 #endif |
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27 #ifdef __sun__ |
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28 #include <sys/ioccom.h> |
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29 #endif |
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30 #include <ctype.h> |
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31 #include <inttypes.h> |
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32 |
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33 #include "qemu_socket.h" |
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34 |
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35 //#define DEBUG_NBD |
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36 |
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37 #ifdef DEBUG_NBD |
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38 #define TRACE(msg, ...) do { \ |
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39 LOG(msg, ## __VA_ARGS__); \ |
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40 } while(0) |
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41 #else |
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42 #define TRACE(msg, ...) \ |
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43 do { } while (0) |
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44 #endif |
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45 |
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46 #define LOG(msg, ...) do { \ |
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47 fprintf(stderr, "%s:%s():L%d: " msg "\n", \ |
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48 __FILE__, __FUNCTION__, __LINE__, ## __VA_ARGS__); \ |
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49 } while(0) |
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50 |
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51 /* This is all part of the "official" NBD API */ |
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52 |
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53 #define NBD_REQUEST_MAGIC 0x25609513 |
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54 #define NBD_REPLY_MAGIC 0x67446698 |
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55 |
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56 #define NBD_SET_SOCK _IO(0xab, 0) |
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57 #define NBD_SET_BLKSIZE _IO(0xab, 1) |
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58 #define NBD_SET_SIZE _IO(0xab, 2) |
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59 #define NBD_DO_IT _IO(0xab, 3) |
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60 #define NBD_CLEAR_SOCK _IO(0xab, 4) |
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61 #define NBD_CLEAR_QUE _IO(0xab, 5) |
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62 #define NBD_PRINT_DEBUG _IO(0xab, 6) |
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63 #define NBD_SET_SIZE_BLOCKS _IO(0xab, 7) |
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64 #define NBD_DISCONNECT _IO(0xab, 8) |
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65 |
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66 /* That's all folks */ |
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67 |
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68 #define read_sync(fd, buffer, size) nbd_wr_sync(fd, buffer, size, true) |
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69 #define write_sync(fd, buffer, size) nbd_wr_sync(fd, buffer, size, false) |
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70 |
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71 size_t nbd_wr_sync(int fd, void *buffer, size_t size, bool do_read) |
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72 { |
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73 size_t offset = 0; |
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74 |
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75 while (offset < size) { |
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76 ssize_t len; |
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77 |
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78 if (do_read) { |
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79 len = recv(fd, buffer + offset, size - offset, 0); |
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80 } else { |
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81 len = send(fd, buffer + offset, size - offset, 0); |
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82 } |
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83 |
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84 if (len == -1) |
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85 errno = socket_error(); |
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86 |
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87 /* recoverable error */ |
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88 if (len == -1 && (errno == EAGAIN || errno == EINTR)) { |
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89 continue; |
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90 } |
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91 |
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92 /* eof */ |
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93 if (len == 0) { |
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94 break; |
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95 } |
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96 |
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97 /* unrecoverable error */ |
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98 if (len == -1) { |
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99 return 0; |
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100 } |
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101 |
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102 offset += len; |
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103 } |
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104 |
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105 return offset; |
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106 } |
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107 |
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108 int tcp_socket_outgoing(const char *address, uint16_t port) |
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109 { |
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110 int s; |
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111 struct in_addr in; |
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112 struct sockaddr_in addr; |
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113 |
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114 s = socket(PF_INET, SOCK_STREAM, 0); |
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115 if (s == -1) { |
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116 return -1; |
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117 } |
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118 |
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119 if (inet_aton(address, &in) == 0) { |
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120 struct hostent *ent; |
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121 |
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122 ent = gethostbyname(address); |
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123 if (ent == NULL) { |
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124 goto error; |
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125 } |
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126 |
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127 memcpy(&in, ent->h_addr, sizeof(in)); |
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128 } |
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129 |
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130 addr.sin_family = AF_INET; |
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131 addr.sin_port = htons(port); |
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132 memcpy(&addr.sin_addr.s_addr, &in, sizeof(in)); |
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133 |
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134 if (connect(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) { |
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135 goto error; |
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136 } |
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137 |
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138 return s; |
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139 error: |
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140 closesocket(s); |
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141 return -1; |
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142 } |
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143 |
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144 int tcp_socket_incoming(const char *address, uint16_t port) |
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145 { |
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146 int s; |
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147 struct in_addr in; |
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148 struct sockaddr_in addr; |
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149 int opt; |
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150 |
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151 s = socket(PF_INET, SOCK_STREAM, 0); |
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152 if (s == -1) { |
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153 return -1; |
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154 } |
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155 |
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156 if (inet_aton(address, &in) == 0) { |
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157 struct hostent *ent; |
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158 |
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159 ent = gethostbyname(address); |
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160 if (ent == NULL) { |
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161 goto error; |
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162 } |
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163 |
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164 memcpy(&in, ent->h_addr, sizeof(in)); |
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165 } |
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166 |
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167 addr.sin_family = AF_INET; |
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168 addr.sin_port = htons(port); |
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169 memcpy(&addr.sin_addr.s_addr, &in, sizeof(in)); |
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170 |
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171 opt = 1; |
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172 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1) { |
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173 goto error; |
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174 } |
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175 |
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176 if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) { |
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177 goto error; |
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178 } |
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179 |
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180 if (listen(s, 128) == -1) { |
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181 goto error; |
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182 } |
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183 |
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184 return s; |
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185 error: |
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186 closesocket(s); |
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187 return -1; |
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188 } |
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189 |
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190 #ifndef _WIN32 |
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191 int unix_socket_incoming(const char *path) |
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192 { |
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193 int s; |
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194 struct sockaddr_un addr; |
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195 |
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196 s = socket(PF_UNIX, SOCK_STREAM, 0); |
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197 if (s == -1) { |
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198 return -1; |
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199 } |
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200 |
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201 memset(&addr, 0, sizeof(addr)); |
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202 addr.sun_family = AF_UNIX; |
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203 pstrcpy(addr.sun_path, sizeof(addr.sun_path), path); |
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204 |
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205 if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) { |
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206 goto error; |
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207 } |
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208 |
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209 if (listen(s, 128) == -1) { |
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210 goto error; |
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211 } |
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212 |
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213 return s; |
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214 error: |
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215 closesocket(s); |
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216 return -1; |
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217 } |
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218 |
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219 int unix_socket_outgoing(const char *path) |
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220 { |
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221 int s; |
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222 struct sockaddr_un addr; |
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223 |
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224 s = socket(PF_UNIX, SOCK_STREAM, 0); |
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225 if (s == -1) { |
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226 return -1; |
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227 } |
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228 |
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229 memset(&addr, 0, sizeof(addr)); |
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230 addr.sun_family = AF_UNIX; |
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231 pstrcpy(addr.sun_path, sizeof(addr.sun_path), path); |
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232 |
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233 if (connect(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) { |
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234 goto error; |
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235 } |
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236 |
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237 return s; |
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238 error: |
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239 closesocket(s); |
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240 return -1; |
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241 } |
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242 #else |
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243 int unix_socket_incoming(const char *path) |
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244 { |
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245 errno = ENOTSUP; |
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246 return -1; |
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247 } |
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248 |
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249 int unix_socket_outgoing(const char *path) |
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250 { |
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251 errno = ENOTSUP; |
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252 return -1; |
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253 } |
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254 #endif |
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255 |
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256 |
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257 /* Basic flow |
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258 |
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259 Server Client |
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260 |
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261 Negotiate |
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262 Request |
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263 Response |
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264 Request |
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265 Response |
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266 ... |
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267 ... |
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268 Request (type == 2) |
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269 */ |
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270 |
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271 int nbd_negotiate(int csock, off_t size) |
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272 { |
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273 char buf[8 + 8 + 8 + 128]; |
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274 |
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275 /* Negotiate |
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276 [ 0 .. 7] passwd ("NBDMAGIC") |
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277 [ 8 .. 15] magic (0x00420281861253) |
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278 [16 .. 23] size |
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279 [24 .. 151] reserved (0) |
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280 */ |
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281 |
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282 TRACE("Beginning negotiation."); |
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283 memcpy(buf, "NBDMAGIC", 8); |
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284 cpu_to_be64w((uint64_t*)(buf + 8), 0x00420281861253LL); |
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285 cpu_to_be64w((uint64_t*)(buf + 16), size); |
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286 memset(buf + 24, 0, 128); |
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287 |
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288 if (write_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
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289 LOG("write failed"); |
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290 errno = EINVAL; |
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291 return -1; |
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292 } |
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293 |
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294 TRACE("Negotation succeeded."); |
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295 |
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296 return 0; |
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297 } |
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298 |
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299 int nbd_receive_negotiate(int csock, off_t *size, size_t *blocksize) |
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300 { |
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301 char buf[8 + 8 + 8 + 128]; |
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302 uint64_t magic; |
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303 |
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304 TRACE("Receiving negotation."); |
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305 |
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306 if (read_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
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307 LOG("read failed"); |
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308 errno = EINVAL; |
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309 return -1; |
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310 } |
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311 |
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312 magic = be64_to_cpup((uint64_t*)(buf + 8)); |
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313 *size = be64_to_cpup((uint64_t*)(buf + 16)); |
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314 *blocksize = 1024; |
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315 |
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316 TRACE("Magic is %c%c%c%c%c%c%c%c", |
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317 qemu_isprint(buf[0]) ? buf[0] : '.', |
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318 qemu_isprint(buf[1]) ? buf[1] : '.', |
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319 qemu_isprint(buf[2]) ? buf[2] : '.', |
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320 qemu_isprint(buf[3]) ? buf[3] : '.', |
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321 qemu_isprint(buf[4]) ? buf[4] : '.', |
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322 qemu_isprint(buf[5]) ? buf[5] : '.', |
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323 qemu_isprint(buf[6]) ? buf[6] : '.', |
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324 qemu_isprint(buf[7]) ? buf[7] : '.'); |
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325 TRACE("Magic is 0x%" PRIx64, magic); |
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326 TRACE("Size is %" PRIu64, *size); |
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327 |
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328 if (memcmp(buf, "NBDMAGIC", 8) != 0) { |
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329 LOG("Invalid magic received"); |
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330 errno = EINVAL; |
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331 return -1; |
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332 } |
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333 |
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334 TRACE("Checking magic"); |
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335 |
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336 if (magic != 0x00420281861253LL) { |
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337 LOG("Bad magic received"); |
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338 errno = EINVAL; |
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339 return -1; |
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340 } |
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341 return 0; |
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342 } |
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343 |
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344 #ifndef _WIN32 |
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345 int nbd_init(int fd, int csock, off_t size, size_t blocksize) |
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346 { |
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347 TRACE("Setting block size to %lu", (unsigned long)blocksize); |
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348 |
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349 if (ioctl(fd, NBD_SET_BLKSIZE, blocksize) == -1) { |
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350 int serrno = errno; |
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351 LOG("Failed setting NBD block size"); |
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352 errno = serrno; |
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353 return -1; |
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354 } |
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355 |
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356 TRACE("Setting size to %llu block(s)", |
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357 (unsigned long long)(size / blocksize)); |
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358 |
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359 if (ioctl(fd, NBD_SET_SIZE_BLOCKS, size / blocksize) == -1) { |
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360 int serrno = errno; |
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361 LOG("Failed setting size (in blocks)"); |
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362 errno = serrno; |
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363 return -1; |
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364 } |
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365 |
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366 TRACE("Clearing NBD socket"); |
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367 |
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368 if (ioctl(fd, NBD_CLEAR_SOCK) == -1) { |
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369 int serrno = errno; |
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370 LOG("Failed clearing NBD socket"); |
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371 errno = serrno; |
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372 return -1; |
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373 } |
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374 |
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375 TRACE("Setting NBD socket"); |
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376 |
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377 if (ioctl(fd, NBD_SET_SOCK, csock) == -1) { |
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378 int serrno = errno; |
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379 LOG("Failed to set NBD socket"); |
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380 errno = serrno; |
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381 return -1; |
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382 } |
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383 |
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384 TRACE("Negotiation ended"); |
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385 |
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386 return 0; |
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387 } |
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388 |
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389 int nbd_disconnect(int fd) |
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390 { |
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391 ioctl(fd, NBD_CLEAR_QUE); |
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392 ioctl(fd, NBD_DISCONNECT); |
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393 ioctl(fd, NBD_CLEAR_SOCK); |
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394 return 0; |
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395 } |
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396 |
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397 int nbd_client(int fd, int csock) |
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398 { |
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399 int ret; |
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400 int serrno; |
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401 |
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402 TRACE("Doing NBD loop"); |
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403 |
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404 ret = ioctl(fd, NBD_DO_IT); |
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405 serrno = errno; |
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406 |
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407 TRACE("NBD loop returned %d: %s", ret, strerror(serrno)); |
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408 |
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409 TRACE("Clearing NBD queue"); |
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410 ioctl(fd, NBD_CLEAR_QUE); |
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411 |
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412 TRACE("Clearing NBD socket"); |
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413 ioctl(fd, NBD_CLEAR_SOCK); |
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414 |
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415 errno = serrno; |
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416 return ret; |
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417 } |
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418 #else |
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419 int nbd_init(int fd, int csock, off_t size, size_t blocksize) |
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420 { |
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421 errno = ENOTSUP; |
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422 return -1; |
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423 } |
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424 |
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425 int nbd_disconnect(int fd) |
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426 { |
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427 errno = ENOTSUP; |
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428 return -1; |
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429 } |
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430 |
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431 int nbd_client(int fd, int csock) |
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432 { |
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433 errno = ENOTSUP; |
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434 return -1; |
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435 } |
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436 #endif |
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437 |
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438 int nbd_send_request(int csock, struct nbd_request *request) |
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439 { |
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440 uint8_t buf[4 + 4 + 8 + 8 + 4]; |
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441 |
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442 cpu_to_be32w((uint32_t*)buf, NBD_REQUEST_MAGIC); |
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443 cpu_to_be32w((uint32_t*)(buf + 4), request->type); |
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444 cpu_to_be64w((uint64_t*)(buf + 8), request->handle); |
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445 cpu_to_be64w((uint64_t*)(buf + 16), request->from); |
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446 cpu_to_be32w((uint32_t*)(buf + 24), request->len); |
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447 |
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448 TRACE("Sending request to client"); |
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449 |
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450 if (write_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
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451 LOG("writing to socket failed"); |
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452 errno = EINVAL; |
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453 return -1; |
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454 } |
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455 return 0; |
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456 } |
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457 |
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458 |
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459 static int nbd_receive_request(int csock, struct nbd_request *request) |
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460 { |
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461 uint8_t buf[4 + 4 + 8 + 8 + 4]; |
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462 uint32_t magic; |
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463 |
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464 if (read_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
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465 LOG("read failed"); |
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466 errno = EINVAL; |
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467 return -1; |
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468 } |
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469 |
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470 /* Request |
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471 [ 0 .. 3] magic (NBD_REQUEST_MAGIC) |
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472 [ 4 .. 7] type (0 == READ, 1 == WRITE) |
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473 [ 8 .. 15] handle |
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474 [16 .. 23] from |
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475 [24 .. 27] len |
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476 */ |
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477 |
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478 magic = be32_to_cpup((uint32_t*)buf); |
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479 request->type = be32_to_cpup((uint32_t*)(buf + 4)); |
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480 request->handle = be64_to_cpup((uint64_t*)(buf + 8)); |
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481 request->from = be64_to_cpup((uint64_t*)(buf + 16)); |
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482 request->len = be32_to_cpup((uint32_t*)(buf + 24)); |
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483 |
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484 TRACE("Got request: " |
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485 "{ magic = 0x%x, .type = %d, from = %" PRIu64" , len = %u }", |
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486 magic, request->type, request->from, request->len); |
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487 |
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488 if (magic != NBD_REQUEST_MAGIC) { |
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489 LOG("invalid magic (got 0x%x)", magic); |
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490 errno = EINVAL; |
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491 return -1; |
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492 } |
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493 return 0; |
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494 } |
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495 |
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496 int nbd_receive_reply(int csock, struct nbd_reply *reply) |
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497 { |
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498 uint8_t buf[4 + 4 + 8]; |
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499 uint32_t magic; |
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500 |
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501 memset(buf, 0xAA, sizeof(buf)); |
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502 |
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503 if (read_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
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504 LOG("read failed"); |
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505 errno = EINVAL; |
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506 return -1; |
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507 } |
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508 |
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509 /* Reply |
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510 [ 0 .. 3] magic (NBD_REPLY_MAGIC) |
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511 [ 4 .. 7] error (0 == no error) |
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512 [ 7 .. 15] handle |
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513 */ |
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514 |
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515 magic = be32_to_cpup((uint32_t*)buf); |
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516 reply->error = be32_to_cpup((uint32_t*)(buf + 4)); |
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517 reply->handle = be64_to_cpup((uint64_t*)(buf + 8)); |
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518 |
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519 TRACE("Got reply: " |
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520 "{ magic = 0x%x, .error = %d, handle = %" PRIu64" }", |
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521 magic, reply->error, reply->handle); |
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522 |
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523 if (magic != NBD_REPLY_MAGIC) { |
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524 LOG("invalid magic (got 0x%x)", magic); |
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525 errno = EINVAL; |
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526 return -1; |
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527 } |
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528 return 0; |
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529 } |
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530 |
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531 static int nbd_send_reply(int csock, struct nbd_reply *reply) |
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532 { |
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533 uint8_t buf[4 + 4 + 8]; |
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534 |
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535 /* Reply |
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536 [ 0 .. 3] magic (NBD_REPLY_MAGIC) |
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537 [ 4 .. 7] error (0 == no error) |
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538 [ 7 .. 15] handle |
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539 */ |
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540 cpu_to_be32w((uint32_t*)buf, NBD_REPLY_MAGIC); |
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541 cpu_to_be32w((uint32_t*)(buf + 4), reply->error); |
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542 cpu_to_be64w((uint64_t*)(buf + 8), reply->handle); |
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543 |
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544 TRACE("Sending response to client"); |
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545 |
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546 if (write_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
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547 LOG("writing to socket failed"); |
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548 errno = EINVAL; |
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549 return -1; |
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550 } |
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551 return 0; |
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552 } |
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553 |
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554 int nbd_trip(BlockDriverState *bs, int csock, off_t size, uint64_t dev_offset, |
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555 off_t *offset, bool readonly, uint8_t *data, int data_size) |
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556 { |
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557 struct nbd_request request; |
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558 struct nbd_reply reply; |
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559 |
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560 TRACE("Reading request."); |
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561 |
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562 if (nbd_receive_request(csock, &request) == -1) |
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563 return -1; |
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564 |
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565 if (request.len > data_size) { |
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566 LOG("len (%u) is larger than max len (%u)", |
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567 request.len, data_size); |
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568 errno = EINVAL; |
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569 return -1; |
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570 } |
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571 |
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572 if ((request.from + request.len) < request.from) { |
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573 LOG("integer overflow detected! " |
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574 "you're probably being attacked"); |
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575 errno = EINVAL; |
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576 return -1; |
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577 } |
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578 |
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579 if ((request.from + request.len) > size) { |
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580 LOG("From: %" PRIu64 ", Len: %u, Size: %" PRIu64 |
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581 ", Offset: %" PRIu64 "\n", |
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582 request.from, request.len, size, dev_offset); |
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583 LOG("requested operation past EOF--bad client?"); |
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584 errno = EINVAL; |
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585 return -1; |
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586 } |
|
587 |
|
588 TRACE("Decoding type"); |
|
589 |
|
590 reply.handle = request.handle; |
|
591 reply.error = 0; |
|
592 |
|
593 switch (request.type) { |
|
594 case NBD_CMD_READ: |
|
595 TRACE("Request type is READ"); |
|
596 |
|
597 if (bdrv_read(bs, (request.from + dev_offset) / 512, data, |
|
598 request.len / 512) == -1) { |
|
599 LOG("reading from file failed"); |
|
600 errno = EINVAL; |
|
601 return -1; |
|
602 } |
|
603 *offset += request.len; |
|
604 |
|
605 TRACE("Read %u byte(s)", request.len); |
|
606 |
|
607 if (nbd_send_reply(csock, &reply) == -1) |
|
608 return -1; |
|
609 |
|
610 TRACE("Sending data to client"); |
|
611 |
|
612 if (write_sync(csock, data, request.len) != request.len) { |
|
613 LOG("writing to socket failed"); |
|
614 errno = EINVAL; |
|
615 return -1; |
|
616 } |
|
617 break; |
|
618 case NBD_CMD_WRITE: |
|
619 TRACE("Request type is WRITE"); |
|
620 |
|
621 TRACE("Reading %u byte(s)", request.len); |
|
622 |
|
623 if (read_sync(csock, data, request.len) != request.len) { |
|
624 LOG("reading from socket failed"); |
|
625 errno = EINVAL; |
|
626 return -1; |
|
627 } |
|
628 |
|
629 if (readonly) { |
|
630 TRACE("Server is read-only, return error"); |
|
631 reply.error = 1; |
|
632 } else { |
|
633 TRACE("Writing to device"); |
|
634 |
|
635 if (bdrv_write(bs, (request.from + dev_offset) / 512, |
|
636 data, request.len / 512) == -1) { |
|
637 LOG("writing to file failed"); |
|
638 errno = EINVAL; |
|
639 return -1; |
|
640 } |
|
641 |
|
642 *offset += request.len; |
|
643 } |
|
644 |
|
645 if (nbd_send_reply(csock, &reply) == -1) |
|
646 return -1; |
|
647 break; |
|
648 case NBD_CMD_DISC: |
|
649 TRACE("Request type is DISCONNECT"); |
|
650 errno = 0; |
|
651 return 1; |
|
652 default: |
|
653 LOG("invalid request type (%u) received", request.type); |
|
654 errno = EINVAL; |
|
655 return -1; |
|
656 } |
|
657 |
|
658 TRACE("Request/Reply complete"); |
|
659 |
|
660 return 0; |
|
661 } |