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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>
36
37static int target_fd;
38static char target_fname[W_MAX_PATH];
39
40static int hv_start_fcopy(struct hv_start_fcopy *smsg)
41{
42 int error = HV_E_FAIL;
43 char *q, *p;
44
45 /*
46 * If possile append a path seperator to the path.
47 */
48 if (strlen((char *)smsg->path_name) < (W_MAX_PATH - 2))
49 strcat((char *)smsg->path_name, "/");
50
51 p = (char *)smsg->path_name;
52 snprintf(target_fname, sizeof(target_fname), "%s/%s",
53 (char *)smsg->path_name, smsg->file_name);
54
55 syslog(LOG_INFO, "Target file name: %s", target_fname);
56 /*
57 * Check to see if the path is already in place; if not,
58 * create if required.
59 */
60 while ((q = strchr(p, '/')) != NULL) {
61 if (q == p) {
62 p++;
63 continue;
64 }
65 *q = '\0';
66 if (access((char *)smsg->path_name, F_OK)) {
67 if (smsg->copy_flags & CREATE_PATH) {
68 if (mkdir((char *)smsg->path_name, 0755)) {
69 syslog(LOG_ERR, "Failed to create %s",
70 (char *)smsg->path_name);
71 goto done;
72 }
73 } else {
74 syslog(LOG_ERR, "Invalid path: %s",
75 (char *)smsg->path_name);
76 goto done;
77 }
78 }
79 p = q + 1;
80 *q = '/';
81 }
82
83 if (!access(target_fname, F_OK)) {
84 syslog(LOG_INFO, "File: %s exists", target_fname);
85 if (!(smsg->copy_flags & OVER_WRITE)) {
86 error = HV_ERROR_ALREADY_EXISTS;
87 goto done;
88 }
89 }
90
91 target_fd = open(target_fname, O_RDWR | O_CREAT | O_CLOEXEC, 0744);
92 if (target_fd == -1) {
93 syslog(LOG_INFO, "Open Failed: %s", strerror(errno));
94 goto done;
95 }
96
97 error = 0;
98done:
99 return error;
100}
101
102static int hv_copy_data(struct hv_do_fcopy *cpmsg)
103{
104 ssize_t bytes_written;
105
106 bytes_written = pwrite(target_fd, cpmsg->data, cpmsg->size,
107 cpmsg->offset);
108
109 if (bytes_written != cpmsg->size)
110 return HV_E_FAIL;
111
112 return 0;
113}
114
115static int hv_copy_finished(void)
116{
117 close(target_fd);
118 return 0;
119}
120static int hv_copy_cancel(void)
121{
122 close(target_fd);
123 unlink(target_fname);
124 return 0;
125
126}
127
128int main(void)
129{
130 int fd, fcopy_fd, len;
131 int error;
132 int version = FCOPY_CURRENT_VERSION;
133 char *buffer[4096 * 2];
134 struct hv_fcopy_hdr *in_msg;
135
136 if (daemon(1, 0)) {
137 syslog(LOG_ERR, "daemon() failed; error: %s", strerror(errno));
138 exit(EXIT_FAILURE);
139 }
140
141 openlog("HV_FCOPY", 0, LOG_USER);
142 syslog(LOG_INFO, "HV_FCOPY starting; pid is:%d", getpid());
143
144 fcopy_fd = open("/dev/vmbus/hv_fcopy", O_RDWR);
145
146 if (fcopy_fd < 0) {
147 syslog(LOG_ERR, "open /dev/vmbus/hv_fcopy failed; error: %d %s",
148 errno, strerror(errno));
149 exit(EXIT_FAILURE);
150 }
151
152 /*
153 * Register with the kernel.
154 */
155 if ((write(fcopy_fd, &version, sizeof(int))) != sizeof(int)) {
156 syslog(LOG_ERR, "Registration failed: %s", strerror(errno));
157 exit(EXIT_FAILURE);
158 }
159
160 while (1) {
161 /*
162 * In this loop we process fcopy messages after the
163 * handshake is complete.
164 */
165 len = pread(fcopy_fd, buffer, (4096 * 2), 0);
166 if (len < 0) {
167 syslog(LOG_ERR, "pread failed: %s", strerror(errno));
168 exit(EXIT_FAILURE);
169 }
170 in_msg = (struct hv_fcopy_hdr *)buffer;
171
172 switch (in_msg->operation) {
173 case START_FILE_COPY:
174 error = hv_start_fcopy((struct hv_start_fcopy *)in_msg);
175 break;
176 case WRITE_TO_FILE:
177 error = hv_copy_data((struct hv_do_fcopy *)in_msg);
178 break;
179 case COMPLETE_FCOPY:
180 error = hv_copy_finished();
181 break;
182 case CANCEL_FCOPY:
183 error = hv_copy_cancel();
184 break;
185
186 default:
187 syslog(LOG_ERR, "Unknown operation: %d",
188 in_msg->operation);
189
190 }
191
192 if (pwrite(fcopy_fd, &error, sizeof(int), 0) != sizeof(int)) {
193 syslog(LOG_ERR, "pwrite failed: %s", strerror(errno));
194 exit(EXIT_FAILURE);
195 }
196 }
197}
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 <stdio.h>
22#include <stdlib.h>
23#include <unistd.h>
24#include <string.h>
25#include <errno.h>
26#include <linux/hyperv.h>
27#include <linux/limits.h>
28#include <syslog.h>
29#include <sys/stat.h>
30#include <fcntl.h>
31#include <getopt.h>
32
33static int target_fd;
34static char target_fname[PATH_MAX];
35static unsigned long long filesize;
36
37static int hv_start_fcopy(struct hv_start_fcopy *smsg)
38{
39 int error = HV_E_FAIL;
40 char *q, *p;
41
42 filesize = 0;
43 p = (char *)smsg->path_name;
44 snprintf(target_fname, sizeof(target_fname), "%s/%s",
45 (char *)smsg->path_name, (char *)smsg->file_name);
46
47 syslog(LOG_INFO, "Target file name: %s", target_fname);
48 /*
49 * Check to see if the path is already in place; if not,
50 * create if required.
51 */
52 while ((q = strchr(p, '/')) != NULL) {
53 if (q == p) {
54 p++;
55 continue;
56 }
57 *q = '\0';
58 if (access((char *)smsg->path_name, F_OK)) {
59 if (smsg->copy_flags & CREATE_PATH) {
60 if (mkdir((char *)smsg->path_name, 0755)) {
61 syslog(LOG_ERR, "Failed to create %s",
62 (char *)smsg->path_name);
63 goto done;
64 }
65 } else {
66 syslog(LOG_ERR, "Invalid path: %s",
67 (char *)smsg->path_name);
68 goto done;
69 }
70 }
71 p = q + 1;
72 *q = '/';
73 }
74
75 if (!access(target_fname, F_OK)) {
76 syslog(LOG_INFO, "File: %s exists", target_fname);
77 if (!(smsg->copy_flags & OVER_WRITE)) {
78 error = HV_ERROR_ALREADY_EXISTS;
79 goto done;
80 }
81 }
82
83 target_fd = open(target_fname,
84 O_RDWR | O_CREAT | O_TRUNC | O_CLOEXEC, 0744);
85 if (target_fd == -1) {
86 syslog(LOG_INFO, "Open Failed: %s", strerror(errno));
87 goto done;
88 }
89
90 error = 0;
91done:
92 return error;
93}
94
95static int hv_copy_data(struct hv_do_fcopy *cpmsg)
96{
97 ssize_t bytes_written;
98 int ret = 0;
99
100 bytes_written = pwrite(target_fd, cpmsg->data, cpmsg->size,
101 cpmsg->offset);
102
103 filesize += cpmsg->size;
104 if (bytes_written != cpmsg->size) {
105 switch (errno) {
106 case ENOSPC:
107 ret = HV_ERROR_DISK_FULL;
108 break;
109 default:
110 ret = HV_E_FAIL;
111 break;
112 }
113 syslog(LOG_ERR, "pwrite failed to write %llu bytes: %ld (%s)",
114 filesize, (long)bytes_written, strerror(errno));
115 }
116
117 return ret;
118}
119
120static int hv_copy_finished(void)
121{
122 close(target_fd);
123 return 0;
124}
125static int hv_copy_cancel(void)
126{
127 close(target_fd);
128 unlink(target_fname);
129 return 0;
130
131}
132
133void print_usage(char *argv[])
134{
135 fprintf(stderr, "Usage: %s [options]\n"
136 "Options are:\n"
137 " -n, --no-daemon stay in foreground, don't daemonize\n"
138 " -h, --help print this help\n", argv[0]);
139}
140
141int main(int argc, char *argv[])
142{
143 int fcopy_fd;
144 int error;
145 int daemonize = 1, long_index = 0, opt;
146 int version = FCOPY_CURRENT_VERSION;
147 union {
148 struct hv_fcopy_hdr hdr;
149 struct hv_start_fcopy start;
150 struct hv_do_fcopy copy;
151 __u32 kernel_modver;
152 } buffer = { };
153 int in_handshake = 1;
154
155 static struct option long_options[] = {
156 {"help", no_argument, 0, 'h' },
157 {"no-daemon", no_argument, 0, 'n' },
158 {0, 0, 0, 0 }
159 };
160
161 while ((opt = getopt_long(argc, argv, "hn", long_options,
162 &long_index)) != -1) {
163 switch (opt) {
164 case 'n':
165 daemonize = 0;
166 break;
167 case 'h':
168 default:
169 print_usage(argv);
170 exit(EXIT_FAILURE);
171 }
172 }
173
174 if (daemonize && daemon(1, 0)) {
175 syslog(LOG_ERR, "daemon() failed; error: %s", strerror(errno));
176 exit(EXIT_FAILURE);
177 }
178
179 openlog("HV_FCOPY", 0, LOG_USER);
180 syslog(LOG_INFO, "starting; pid is:%d", getpid());
181
182 fcopy_fd = open("/dev/vmbus/hv_fcopy", O_RDWR);
183
184 if (fcopy_fd < 0) {
185 syslog(LOG_ERR, "open /dev/vmbus/hv_fcopy failed; error: %d %s",
186 errno, strerror(errno));
187 exit(EXIT_FAILURE);
188 }
189
190 /*
191 * Register with the kernel.
192 */
193 if ((write(fcopy_fd, &version, sizeof(int))) != sizeof(int)) {
194 syslog(LOG_ERR, "Registration failed: %s", strerror(errno));
195 exit(EXIT_FAILURE);
196 }
197
198 while (1) {
199 /*
200 * In this loop we process fcopy messages after the
201 * handshake is complete.
202 */
203 ssize_t len;
204
205 len = pread(fcopy_fd, &buffer, sizeof(buffer), 0);
206 if (len < 0) {
207 syslog(LOG_ERR, "pread failed: %s", strerror(errno));
208 exit(EXIT_FAILURE);
209 }
210
211 if (in_handshake) {
212 if (len != sizeof(buffer.kernel_modver)) {
213 syslog(LOG_ERR, "invalid version negotiation");
214 exit(EXIT_FAILURE);
215 }
216 in_handshake = 0;
217 syslog(LOG_INFO, "kernel module version: %u",
218 buffer.kernel_modver);
219 continue;
220 }
221
222 switch (buffer.hdr.operation) {
223 case START_FILE_COPY:
224 error = hv_start_fcopy(&buffer.start);
225 break;
226 case WRITE_TO_FILE:
227 error = hv_copy_data(&buffer.copy);
228 break;
229 case COMPLETE_FCOPY:
230 error = hv_copy_finished();
231 break;
232 case CANCEL_FCOPY:
233 error = hv_copy_cancel();
234 break;
235
236 default:
237 syslog(LOG_ERR, "Unknown operation: %d",
238 buffer.hdr.operation);
239
240 }
241
242 if (pwrite(fcopy_fd, &error, sizeof(int), 0) != sizeof(int)) {
243 syslog(LOG_ERR, "pwrite failed: %s", strerror(errno));
244 exit(EXIT_FAILURE);
245 }
246 }
247}