K. Y. Srinivasan | 01325476 | 2014-02-16 11:34:30 -0800 | [diff] [blame] | 1 | /* |
| 2 | * An implementation of host to guest copy functionality for Linux. |
| 3 | * |
| 4 | * Copyright (C) 2014, Microsoft, Inc. |
| 5 | * |
| 6 | * Author : K. Y. Srinivasan <kys@microsoft.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify it |
| 9 | * under the terms of the GNU General Public License version 2 as published |
| 10 | * by the Free Software Foundation. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, but |
| 13 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or |
| 15 | * NON INFRINGEMENT. See the GNU General Public License for more |
| 16 | * details. |
| 17 | */ |
| 18 | |
| 19 | |
| 20 | #include <sys/types.h> |
| 21 | #include <sys/socket.h> |
| 22 | #include <sys/poll.h> |
| 23 | #include <linux/types.h> |
| 24 | #include <linux/kdev_t.h> |
| 25 | #include <stdio.h> |
| 26 | #include <stdlib.h> |
| 27 | #include <unistd.h> |
| 28 | #include <string.h> |
| 29 | #include <ctype.h> |
| 30 | #include <errno.h> |
| 31 | #include <linux/hyperv.h> |
| 32 | #include <syslog.h> |
| 33 | #include <sys/stat.h> |
| 34 | #include <fcntl.h> |
| 35 | #include <dirent.h> |
Vitaly Kuznetsov | 170f4be | 2014-10-22 18:07:11 +0200 | [diff] [blame] | 36 | #include <getopt.h> |
K. Y. Srinivasan | 01325476 | 2014-02-16 11:34:30 -0800 | [diff] [blame] | 37 | |
| 38 | static int target_fd; |
| 39 | static char target_fname[W_MAX_PATH]; |
| 40 | |
| 41 | static int hv_start_fcopy(struct hv_start_fcopy *smsg) |
| 42 | { |
| 43 | int error = HV_E_FAIL; |
| 44 | char *q, *p; |
| 45 | |
| 46 | /* |
| 47 | * If possile append a path seperator to the path. |
| 48 | */ |
| 49 | if (strlen((char *)smsg->path_name) < (W_MAX_PATH - 2)) |
| 50 | strcat((char *)smsg->path_name, "/"); |
| 51 | |
| 52 | p = (char *)smsg->path_name; |
| 53 | snprintf(target_fname, sizeof(target_fname), "%s/%s", |
| 54 | (char *)smsg->path_name, smsg->file_name); |
| 55 | |
| 56 | syslog(LOG_INFO, "Target file name: %s", target_fname); |
| 57 | /* |
| 58 | * Check to see if the path is already in place; if not, |
| 59 | * create if required. |
| 60 | */ |
| 61 | while ((q = strchr(p, '/')) != NULL) { |
| 62 | if (q == p) { |
| 63 | p++; |
| 64 | continue; |
| 65 | } |
| 66 | *q = '\0'; |
| 67 | if (access((char *)smsg->path_name, F_OK)) { |
| 68 | if (smsg->copy_flags & CREATE_PATH) { |
| 69 | if (mkdir((char *)smsg->path_name, 0755)) { |
| 70 | syslog(LOG_ERR, "Failed to create %s", |
| 71 | (char *)smsg->path_name); |
| 72 | goto done; |
| 73 | } |
| 74 | } else { |
| 75 | syslog(LOG_ERR, "Invalid path: %s", |
| 76 | (char *)smsg->path_name); |
| 77 | goto done; |
| 78 | } |
| 79 | } |
| 80 | p = q + 1; |
| 81 | *q = '/'; |
| 82 | } |
| 83 | |
| 84 | if (!access(target_fname, F_OK)) { |
| 85 | syslog(LOG_INFO, "File: %s exists", target_fname); |
K. Y. Srinivasan | 314672a | 2014-04-09 17:24:16 -0700 | [diff] [blame] | 86 | if (!(smsg->copy_flags & OVER_WRITE)) { |
| 87 | error = HV_ERROR_ALREADY_EXISTS; |
K. Y. Srinivasan | 01325476 | 2014-02-16 11:34:30 -0800 | [diff] [blame] | 88 | goto done; |
K. Y. Srinivasan | 314672a | 2014-04-09 17:24:16 -0700 | [diff] [blame] | 89 | } |
K. Y. Srinivasan | 01325476 | 2014-02-16 11:34:30 -0800 | [diff] [blame] | 90 | } |
| 91 | |
Yue Zhang | e013ac3 | 2014-06-27 18:19:48 -0700 | [diff] [blame] | 92 | target_fd = open(target_fname, |
| 93 | O_RDWR | O_CREAT | O_TRUNC | O_CLOEXEC, 0744); |
K. Y. Srinivasan | 01325476 | 2014-02-16 11:34:30 -0800 | [diff] [blame] | 94 | if (target_fd == -1) { |
| 95 | syslog(LOG_INFO, "Open Failed: %s", strerror(errno)); |
| 96 | goto done; |
| 97 | } |
| 98 | |
| 99 | error = 0; |
| 100 | done: |
| 101 | return error; |
| 102 | } |
| 103 | |
| 104 | static int hv_copy_data(struct hv_do_fcopy *cpmsg) |
| 105 | { |
| 106 | ssize_t bytes_written; |
| 107 | |
| 108 | bytes_written = pwrite(target_fd, cpmsg->data, cpmsg->size, |
| 109 | cpmsg->offset); |
| 110 | |
| 111 | if (bytes_written != cpmsg->size) |
| 112 | return HV_E_FAIL; |
| 113 | |
| 114 | return 0; |
| 115 | } |
| 116 | |
| 117 | static int hv_copy_finished(void) |
| 118 | { |
| 119 | close(target_fd); |
| 120 | return 0; |
| 121 | } |
| 122 | static int hv_copy_cancel(void) |
| 123 | { |
| 124 | close(target_fd); |
| 125 | unlink(target_fname); |
| 126 | return 0; |
| 127 | |
| 128 | } |
| 129 | |
Vitaly Kuznetsov | 170f4be | 2014-10-22 18:07:11 +0200 | [diff] [blame] | 130 | void print_usage(char *argv[]) |
| 131 | { |
| 132 | fprintf(stderr, "Usage: %s [options]\n" |
| 133 | "Options are:\n" |
| 134 | " -n, --no-daemon stay in foreground, don't daemonize\n" |
| 135 | " -h, --help print this help\n", argv[0]); |
| 136 | } |
| 137 | |
| 138 | int main(int argc, char *argv[]) |
K. Y. Srinivasan | 01325476 | 2014-02-16 11:34:30 -0800 | [diff] [blame] | 139 | { |
| 140 | int fd, fcopy_fd, len; |
| 141 | int error; |
Vitaly Kuznetsov | 170f4be | 2014-10-22 18:07:11 +0200 | [diff] [blame] | 142 | int daemonize = 1, long_index = 0, opt; |
K. Y. Srinivasan | 01325476 | 2014-02-16 11:34:30 -0800 | [diff] [blame] | 143 | int version = FCOPY_CURRENT_VERSION; |
| 144 | char *buffer[4096 * 2]; |
| 145 | struct hv_fcopy_hdr *in_msg; |
| 146 | |
Vitaly Kuznetsov | 170f4be | 2014-10-22 18:07:11 +0200 | [diff] [blame] | 147 | static struct option long_options[] = { |
| 148 | {"help", no_argument, 0, 'h' }, |
| 149 | {"no-daemon", no_argument, 0, 'n' }, |
| 150 | {0, 0, 0, 0 } |
| 151 | }; |
| 152 | |
| 153 | while ((opt = getopt_long(argc, argv, "hn", long_options, |
| 154 | &long_index)) != -1) { |
| 155 | switch (opt) { |
| 156 | case 'n': |
| 157 | daemonize = 0; |
| 158 | break; |
| 159 | case 'h': |
| 160 | default: |
| 161 | print_usage(argv); |
| 162 | exit(EXIT_FAILURE); |
| 163 | } |
| 164 | } |
| 165 | |
| 166 | if (daemonize && daemon(1, 0)) { |
K. Y. Srinivasan | 01325476 | 2014-02-16 11:34:30 -0800 | [diff] [blame] | 167 | syslog(LOG_ERR, "daemon() failed; error: %s", strerror(errno)); |
| 168 | exit(EXIT_FAILURE); |
| 169 | } |
| 170 | |
| 171 | openlog("HV_FCOPY", 0, LOG_USER); |
| 172 | syslog(LOG_INFO, "HV_FCOPY starting; pid is:%d", getpid()); |
| 173 | |
| 174 | fcopy_fd = open("/dev/vmbus/hv_fcopy", O_RDWR); |
| 175 | |
| 176 | if (fcopy_fd < 0) { |
| 177 | syslog(LOG_ERR, "open /dev/vmbus/hv_fcopy failed; error: %d %s", |
| 178 | errno, strerror(errno)); |
| 179 | exit(EXIT_FAILURE); |
| 180 | } |
| 181 | |
| 182 | /* |
| 183 | * Register with the kernel. |
| 184 | */ |
| 185 | if ((write(fcopy_fd, &version, sizeof(int))) != sizeof(int)) { |
| 186 | syslog(LOG_ERR, "Registration failed: %s", strerror(errno)); |
| 187 | exit(EXIT_FAILURE); |
| 188 | } |
| 189 | |
| 190 | while (1) { |
| 191 | /* |
| 192 | * In this loop we process fcopy messages after the |
| 193 | * handshake is complete. |
| 194 | */ |
| 195 | len = pread(fcopy_fd, buffer, (4096 * 2), 0); |
| 196 | if (len < 0) { |
| 197 | syslog(LOG_ERR, "pread failed: %s", strerror(errno)); |
| 198 | exit(EXIT_FAILURE); |
| 199 | } |
| 200 | in_msg = (struct hv_fcopy_hdr *)buffer; |
| 201 | |
| 202 | switch (in_msg->operation) { |
| 203 | case START_FILE_COPY: |
| 204 | error = hv_start_fcopy((struct hv_start_fcopy *)in_msg); |
| 205 | break; |
| 206 | case WRITE_TO_FILE: |
| 207 | error = hv_copy_data((struct hv_do_fcopy *)in_msg); |
| 208 | break; |
| 209 | case COMPLETE_FCOPY: |
| 210 | error = hv_copy_finished(); |
| 211 | break; |
| 212 | case CANCEL_FCOPY: |
| 213 | error = hv_copy_cancel(); |
| 214 | break; |
| 215 | |
| 216 | default: |
| 217 | syslog(LOG_ERR, "Unknown operation: %d", |
| 218 | in_msg->operation); |
| 219 | |
| 220 | } |
| 221 | |
| 222 | if (pwrite(fcopy_fd, &error, sizeof(int), 0) != sizeof(int)) { |
| 223 | syslog(LOG_ERR, "pwrite failed: %s", strerror(errno)); |
| 224 | exit(EXIT_FAILURE); |
| 225 | } |
| 226 | } |
| 227 | } |