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