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Commit | Line | Data |
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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> | |
01325476 S |
21 | #include <stdio.h> |
22 | #include <stdlib.h> | |
23 | #include <unistd.h> | |
01325476 S |
24 | #include <errno.h> |
25 | #include <linux/hyperv.h> | |
26 | #include <syslog.h> | |
27 | #include <sys/stat.h> | |
28 | #include <fcntl.h> | |
170f4bea | 29 | #include <getopt.h> |
01325476 S |
30 | |
31 | static int target_fd; | |
32 | static char target_fname[W_MAX_PATH]; | |
b4ed5d16 | 33 | static unsigned long long filesize; |
01325476 S |
34 | |
35 | static int hv_start_fcopy(struct hv_start_fcopy *smsg) | |
36 | { | |
37 | int error = HV_E_FAIL; | |
38 | char *q, *p; | |
39 | ||
b4ed5d16 | 40 | filesize = 0; |
01325476 S |
41 | p = (char *)smsg->path_name; |
42 | snprintf(target_fname, sizeof(target_fname), "%s/%s", | |
aba474b8 | 43 | (char *)smsg->path_name, (char *)smsg->file_name); |
01325476 S |
44 | |
45 | syslog(LOG_INFO, "Target file name: %s", target_fname); | |
46 | /* | |
47 | * Check to see if the path is already in place; if not, | |
48 | * create if required. | |
49 | */ | |
50 | while ((q = strchr(p, '/')) != NULL) { | |
51 | if (q == p) { | |
52 | p++; | |
53 | continue; | |
54 | } | |
55 | *q = '\0'; | |
56 | if (access((char *)smsg->path_name, F_OK)) { | |
57 | if (smsg->copy_flags & CREATE_PATH) { | |
58 | if (mkdir((char *)smsg->path_name, 0755)) { | |
59 | syslog(LOG_ERR, "Failed to create %s", | |
60 | (char *)smsg->path_name); | |
61 | goto done; | |
62 | } | |
63 | } else { | |
64 | syslog(LOG_ERR, "Invalid path: %s", | |
65 | (char *)smsg->path_name); | |
66 | goto done; | |
67 | } | |
68 | } | |
69 | p = q + 1; | |
70 | *q = '/'; | |
71 | } | |
72 | ||
73 | if (!access(target_fname, F_OK)) { | |
74 | syslog(LOG_INFO, "File: %s exists", target_fname); | |
314672a2 S |
75 | if (!(smsg->copy_flags & OVER_WRITE)) { |
76 | error = HV_ERROR_ALREADY_EXISTS; | |
01325476 | 77 | goto done; |
314672a2 | 78 | } |
01325476 S |
79 | } |
80 | ||
e013ac31 YZ |
81 | target_fd = open(target_fname, |
82 | O_RDWR | O_CREAT | O_TRUNC | O_CLOEXEC, 0744); | |
01325476 S |
83 | if (target_fd == -1) { |
84 | syslog(LOG_INFO, "Open Failed: %s", strerror(errno)); | |
85 | goto done; | |
86 | } | |
87 | ||
88 | error = 0; | |
89 | done: | |
90 | return error; | |
91 | } | |
92 | ||
93 | static int hv_copy_data(struct hv_do_fcopy *cpmsg) | |
94 | { | |
95 | ssize_t bytes_written; | |
b4ed5d16 | 96 | int ret = 0; |
01325476 S |
97 | |
98 | bytes_written = pwrite(target_fd, cpmsg->data, cpmsg->size, | |
99 | cpmsg->offset); | |
100 | ||
b4ed5d16 OH |
101 | filesize += cpmsg->size; |
102 | if (bytes_written != cpmsg->size) { | |
103 | switch (errno) { | |
104 | case ENOSPC: | |
105 | ret = HV_ERROR_DISK_FULL; | |
106 | break; | |
107 | default: | |
108 | ret = HV_E_FAIL; | |
109 | break; | |
110 | } | |
111 | syslog(LOG_ERR, "pwrite failed to write %llu bytes: %ld (%s)", | |
112 | filesize, (long)bytes_written, strerror(errno)); | |
113 | } | |
01325476 | 114 | |
b4ed5d16 | 115 | return ret; |
01325476 S |
116 | } |
117 | ||
118 | static int hv_copy_finished(void) | |
119 | { | |
120 | close(target_fd); | |
121 | return 0; | |
122 | } | |
123 | static int hv_copy_cancel(void) | |
124 | { | |
125 | close(target_fd); | |
126 | unlink(target_fname); | |
127 | return 0; | |
128 | ||
129 | } | |
130 | ||
170f4bea VK |
131 | void print_usage(char *argv[]) |
132 | { | |
133 | fprintf(stderr, "Usage: %s [options]\n" | |
134 | "Options are:\n" | |
135 | " -n, --no-daemon stay in foreground, don't daemonize\n" | |
136 | " -h, --help print this help\n", argv[0]); | |
137 | } | |
138 | ||
139 | int main(int argc, char *argv[]) | |
01325476 | 140 | { |
aba474b8 | 141 | int fcopy_fd, len; |
01325476 | 142 | int error; |
170f4bea | 143 | int daemonize = 1, long_index = 0, opt; |
01325476 S |
144 | int version = FCOPY_CURRENT_VERSION; |
145 | char *buffer[4096 * 2]; | |
146 | struct hv_fcopy_hdr *in_msg; | |
a4d1ee5b VK |
147 | int in_handshake = 1; |
148 | __u32 kernel_modver; | |
01325476 | 149 | |
170f4bea VK |
150 | static struct option long_options[] = { |
151 | {"help", no_argument, 0, 'h' }, | |
152 | {"no-daemon", no_argument, 0, 'n' }, | |
153 | {0, 0, 0, 0 } | |
154 | }; | |
155 | ||
156 | while ((opt = getopt_long(argc, argv, "hn", long_options, | |
157 | &long_index)) != -1) { | |
158 | switch (opt) { | |
159 | case 'n': | |
160 | daemonize = 0; | |
161 | break; | |
162 | case 'h': | |
163 | default: | |
164 | print_usage(argv); | |
165 | exit(EXIT_FAILURE); | |
166 | } | |
167 | } | |
168 | ||
169 | if (daemonize && daemon(1, 0)) { | |
01325476 S |
170 | syslog(LOG_ERR, "daemon() failed; error: %s", strerror(errno)); |
171 | exit(EXIT_FAILURE); | |
172 | } | |
173 | ||
174 | openlog("HV_FCOPY", 0, LOG_USER); | |
6dfb867c | 175 | syslog(LOG_INFO, "starting; pid is:%d", getpid()); |
01325476 S |
176 | |
177 | fcopy_fd = open("/dev/vmbus/hv_fcopy", O_RDWR); | |
178 | ||
179 | if (fcopy_fd < 0) { | |
180 | syslog(LOG_ERR, "open /dev/vmbus/hv_fcopy failed; error: %d %s", | |
181 | errno, strerror(errno)); | |
182 | exit(EXIT_FAILURE); | |
183 | } | |
184 | ||
185 | /* | |
186 | * Register with the kernel. | |
187 | */ | |
188 | if ((write(fcopy_fd, &version, sizeof(int))) != sizeof(int)) { | |
189 | syslog(LOG_ERR, "Registration failed: %s", strerror(errno)); | |
190 | exit(EXIT_FAILURE); | |
191 | } | |
192 | ||
193 | while (1) { | |
194 | /* | |
195 | * In this loop we process fcopy messages after the | |
196 | * handshake is complete. | |
197 | */ | |
198 | len = pread(fcopy_fd, buffer, (4096 * 2), 0); | |
199 | if (len < 0) { | |
200 | syslog(LOG_ERR, "pread failed: %s", strerror(errno)); | |
201 | exit(EXIT_FAILURE); | |
202 | } | |
a4d1ee5b VK |
203 | |
204 | if (in_handshake) { | |
205 | if (len != sizeof(kernel_modver)) { | |
206 | syslog(LOG_ERR, "invalid version negotiation"); | |
207 | exit(EXIT_FAILURE); | |
208 | } | |
209 | kernel_modver = *(__u32 *)buffer; | |
210 | in_handshake = 0; | |
6dfb867c | 211 | syslog(LOG_INFO, "kernel module version: %d", |
a4d1ee5b VK |
212 | kernel_modver); |
213 | continue; | |
214 | } | |
215 | ||
01325476 S |
216 | in_msg = (struct hv_fcopy_hdr *)buffer; |
217 | ||
218 | switch (in_msg->operation) { | |
219 | case START_FILE_COPY: | |
220 | error = hv_start_fcopy((struct hv_start_fcopy *)in_msg); | |
221 | break; | |
222 | case WRITE_TO_FILE: | |
223 | error = hv_copy_data((struct hv_do_fcopy *)in_msg); | |
224 | break; | |
225 | case COMPLETE_FCOPY: | |
226 | error = hv_copy_finished(); | |
227 | break; | |
228 | case CANCEL_FCOPY: | |
229 | error = hv_copy_cancel(); | |
230 | break; | |
231 | ||
232 | default: | |
233 | syslog(LOG_ERR, "Unknown operation: %d", | |
234 | in_msg->operation); | |
235 | ||
236 | } | |
237 | ||
238 | if (pwrite(fcopy_fd, &error, sizeof(int), 0) != sizeof(int)) { | |
239 | syslog(LOG_ERR, "pwrite failed: %s", strerror(errno)); | |
240 | exit(EXIT_FAILURE); | |
241 | } | |
242 | } | |
243 | } |