Commit | Line | Data |
---|---|---|
01325476 S |
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> | |
170f4bea | 36 | #include <getopt.h> |
01325476 S |
37 | |
38 | static int target_fd; | |
39 | static char target_fname[W_MAX_PATH]; | |
b4ed5d16 | 40 | static unsigned long long filesize; |
01325476 S |
41 | |
42 | static int hv_start_fcopy(struct hv_start_fcopy *smsg) | |
43 | { | |
44 | int error = HV_E_FAIL; | |
45 | char *q, *p; | |
46 | ||
b4ed5d16 | 47 | filesize = 0; |
01325476 S |
48 | p = (char *)smsg->path_name; |
49 | snprintf(target_fname, sizeof(target_fname), "%s/%s", | |
aba474b8 | 50 | (char *)smsg->path_name, (char *)smsg->file_name); |
01325476 S |
51 | |
52 | syslog(LOG_INFO, "Target file name: %s", target_fname); | |
53 | /* | |
54 | * Check to see if the path is already in place; if not, | |
55 | * create if required. | |
56 | */ | |
57 | while ((q = strchr(p, '/')) != NULL) { | |
58 | if (q == p) { | |
59 | p++; | |
60 | continue; | |
61 | } | |
62 | *q = '\0'; | |
63 | if (access((char *)smsg->path_name, F_OK)) { | |
64 | if (smsg->copy_flags & CREATE_PATH) { | |
65 | if (mkdir((char *)smsg->path_name, 0755)) { | |
66 | syslog(LOG_ERR, "Failed to create %s", | |
67 | (char *)smsg->path_name); | |
68 | goto done; | |
69 | } | |
70 | } else { | |
71 | syslog(LOG_ERR, "Invalid path: %s", | |
72 | (char *)smsg->path_name); | |
73 | goto done; | |
74 | } | |
75 | } | |
76 | p = q + 1; | |
77 | *q = '/'; | |
78 | } | |
79 | ||
80 | if (!access(target_fname, F_OK)) { | |
81 | syslog(LOG_INFO, "File: %s exists", target_fname); | |
314672a2 S |
82 | if (!(smsg->copy_flags & OVER_WRITE)) { |
83 | error = HV_ERROR_ALREADY_EXISTS; | |
01325476 | 84 | goto done; |
314672a2 | 85 | } |
01325476 S |
86 | } |
87 | ||
e013ac31 YZ |
88 | target_fd = open(target_fname, |
89 | O_RDWR | O_CREAT | O_TRUNC | O_CLOEXEC, 0744); | |
01325476 S |
90 | if (target_fd == -1) { |
91 | syslog(LOG_INFO, "Open Failed: %s", strerror(errno)); | |
92 | goto done; | |
93 | } | |
94 | ||
95 | error = 0; | |
96 | done: | |
97 | return error; | |
98 | } | |
99 | ||
100 | static int hv_copy_data(struct hv_do_fcopy *cpmsg) | |
101 | { | |
102 | ssize_t bytes_written; | |
b4ed5d16 | 103 | int ret = 0; |
01325476 S |
104 | |
105 | bytes_written = pwrite(target_fd, cpmsg->data, cpmsg->size, | |
106 | cpmsg->offset); | |
107 | ||
b4ed5d16 OH |
108 | filesize += cpmsg->size; |
109 | if (bytes_written != cpmsg->size) { | |
110 | switch (errno) { | |
111 | case ENOSPC: | |
112 | ret = HV_ERROR_DISK_FULL; | |
113 | break; | |
114 | default: | |
115 | ret = HV_E_FAIL; | |
116 | break; | |
117 | } | |
118 | syslog(LOG_ERR, "pwrite failed to write %llu bytes: %ld (%s)", | |
119 | filesize, (long)bytes_written, strerror(errno)); | |
120 | } | |
01325476 | 121 | |
b4ed5d16 | 122 | return ret; |
01325476 S |
123 | } |
124 | ||
125 | static int hv_copy_finished(void) | |
126 | { | |
127 | close(target_fd); | |
128 | return 0; | |
129 | } | |
130 | static int hv_copy_cancel(void) | |
131 | { | |
132 | close(target_fd); | |
133 | unlink(target_fname); | |
134 | return 0; | |
135 | ||
136 | } | |
137 | ||
170f4bea VK |
138 | void print_usage(char *argv[]) |
139 | { | |
140 | fprintf(stderr, "Usage: %s [options]\n" | |
141 | "Options are:\n" | |
142 | " -n, --no-daemon stay in foreground, don't daemonize\n" | |
143 | " -h, --help print this help\n", argv[0]); | |
144 | } | |
145 | ||
146 | int main(int argc, char *argv[]) | |
01325476 | 147 | { |
aba474b8 | 148 | int fcopy_fd, len; |
01325476 | 149 | int error; |
170f4bea | 150 | int daemonize = 1, long_index = 0, opt; |
01325476 S |
151 | int version = FCOPY_CURRENT_VERSION; |
152 | char *buffer[4096 * 2]; | |
153 | struct hv_fcopy_hdr *in_msg; | |
a4d1ee5b VK |
154 | int in_handshake = 1; |
155 | __u32 kernel_modver; | |
01325476 | 156 | |
170f4bea VK |
157 | static struct option long_options[] = { |
158 | {"help", no_argument, 0, 'h' }, | |
159 | {"no-daemon", no_argument, 0, 'n' }, | |
160 | {0, 0, 0, 0 } | |
161 | }; | |
162 | ||
163 | while ((opt = getopt_long(argc, argv, "hn", long_options, | |
164 | &long_index)) != -1) { | |
165 | switch (opt) { | |
166 | case 'n': | |
167 | daemonize = 0; | |
168 | break; | |
169 | case 'h': | |
170 | default: | |
171 | print_usage(argv); | |
172 | exit(EXIT_FAILURE); | |
173 | } | |
174 | } | |
175 | ||
176 | if (daemonize && daemon(1, 0)) { | |
01325476 S |
177 | syslog(LOG_ERR, "daemon() failed; error: %s", strerror(errno)); |
178 | exit(EXIT_FAILURE); | |
179 | } | |
180 | ||
181 | openlog("HV_FCOPY", 0, LOG_USER); | |
6dfb867c | 182 | syslog(LOG_INFO, "starting; pid is:%d", getpid()); |
01325476 S |
183 | |
184 | fcopy_fd = open("/dev/vmbus/hv_fcopy", O_RDWR); | |
185 | ||
186 | if (fcopy_fd < 0) { | |
187 | syslog(LOG_ERR, "open /dev/vmbus/hv_fcopy failed; error: %d %s", | |
188 | errno, strerror(errno)); | |
189 | exit(EXIT_FAILURE); | |
190 | } | |
191 | ||
192 | /* | |
193 | * Register with the kernel. | |
194 | */ | |
195 | if ((write(fcopy_fd, &version, sizeof(int))) != sizeof(int)) { | |
196 | syslog(LOG_ERR, "Registration failed: %s", strerror(errno)); | |
197 | exit(EXIT_FAILURE); | |
198 | } | |
199 | ||
200 | while (1) { | |
201 | /* | |
202 | * In this loop we process fcopy messages after the | |
203 | * handshake is complete. | |
204 | */ | |
205 | len = pread(fcopy_fd, buffer, (4096 * 2), 0); | |
206 | if (len < 0) { | |
207 | syslog(LOG_ERR, "pread failed: %s", strerror(errno)); | |
208 | exit(EXIT_FAILURE); | |
209 | } | |
a4d1ee5b VK |
210 | |
211 | if (in_handshake) { | |
212 | if (len != sizeof(kernel_modver)) { | |
213 | syslog(LOG_ERR, "invalid version negotiation"); | |
214 | exit(EXIT_FAILURE); | |
215 | } | |
216 | kernel_modver = *(__u32 *)buffer; | |
217 | in_handshake = 0; | |
6dfb867c | 218 | syslog(LOG_INFO, "kernel module version: %d", |
a4d1ee5b VK |
219 | kernel_modver); |
220 | continue; | |
221 | } | |
222 | ||
01325476 S |
223 | in_msg = (struct hv_fcopy_hdr *)buffer; |
224 | ||
225 | switch (in_msg->operation) { | |
226 | case START_FILE_COPY: | |
227 | error = hv_start_fcopy((struct hv_start_fcopy *)in_msg); | |
228 | break; | |
229 | case WRITE_TO_FILE: | |
230 | error = hv_copy_data((struct hv_do_fcopy *)in_msg); | |
231 | break; | |
232 | case COMPLETE_FCOPY: | |
233 | error = hv_copy_finished(); | |
234 | break; | |
235 | case CANCEL_FCOPY: | |
236 | error = hv_copy_cancel(); | |
237 | break; | |
238 | ||
239 | default: | |
240 | syslog(LOG_ERR, "Unknown operation: %d", | |
241 | in_msg->operation); | |
242 | ||
243 | } | |
244 | ||
245 | if (pwrite(fcopy_fd, &error, sizeof(int), 0) != sizeof(int)) { | |
246 | syslog(LOG_ERR, "pwrite failed: %s", strerror(errno)); | |
247 | exit(EXIT_FAILURE); | |
248 | } | |
249 | } | |
250 | } |