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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> | |
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 | ||
37 | static int target_fd; | |
38 | static char target_fname[W_MAX_PATH]; | |
39 | ||
40 | static 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); | |
314672a2 S |
85 | if (!(smsg->copy_flags & OVER_WRITE)) { |
86 | error = HV_ERROR_ALREADY_EXISTS; | |
01325476 | 87 | goto done; |
314672a2 | 88 | } |
01325476 S |
89 | } |
90 | ||
e013ac31 YZ |
91 | target_fd = open(target_fname, |
92 | O_RDWR | O_CREAT | O_TRUNC | O_CLOEXEC, 0744); | |
01325476 S |
93 | if (target_fd == -1) { |
94 | syslog(LOG_INFO, "Open Failed: %s", strerror(errno)); | |
95 | goto done; | |
96 | } | |
97 | ||
98 | error = 0; | |
99 | done: | |
100 | return error; | |
101 | } | |
102 | ||
103 | static int hv_copy_data(struct hv_do_fcopy *cpmsg) | |
104 | { | |
105 | ssize_t bytes_written; | |
106 | ||
107 | bytes_written = pwrite(target_fd, cpmsg->data, cpmsg->size, | |
108 | cpmsg->offset); | |
109 | ||
110 | if (bytes_written != cpmsg->size) | |
111 | return HV_E_FAIL; | |
112 | ||
113 | return 0; | |
114 | } | |
115 | ||
116 | static int hv_copy_finished(void) | |
117 | { | |
118 | close(target_fd); | |
119 | return 0; | |
120 | } | |
121 | static int hv_copy_cancel(void) | |
122 | { | |
123 | close(target_fd); | |
124 | unlink(target_fname); | |
125 | return 0; | |
126 | ||
127 | } | |
128 | ||
129 | int main(void) | |
130 | { | |
131 | int fd, fcopy_fd, len; | |
132 | int error; | |
133 | int version = FCOPY_CURRENT_VERSION; | |
134 | char *buffer[4096 * 2]; | |
135 | struct hv_fcopy_hdr *in_msg; | |
136 | ||
137 | if (daemon(1, 0)) { | |
138 | syslog(LOG_ERR, "daemon() failed; error: %s", strerror(errno)); | |
139 | exit(EXIT_FAILURE); | |
140 | } | |
141 | ||
142 | openlog("HV_FCOPY", 0, LOG_USER); | |
143 | syslog(LOG_INFO, "HV_FCOPY starting; pid is:%d", getpid()); | |
144 | ||
145 | fcopy_fd = open("/dev/vmbus/hv_fcopy", O_RDWR); | |
146 | ||
147 | if (fcopy_fd < 0) { | |
148 | syslog(LOG_ERR, "open /dev/vmbus/hv_fcopy failed; error: %d %s", | |
149 | errno, strerror(errno)); | |
150 | exit(EXIT_FAILURE); | |
151 | } | |
152 | ||
153 | /* | |
154 | * Register with the kernel. | |
155 | */ | |
156 | if ((write(fcopy_fd, &version, sizeof(int))) != sizeof(int)) { | |
157 | syslog(LOG_ERR, "Registration failed: %s", strerror(errno)); | |
158 | exit(EXIT_FAILURE); | |
159 | } | |
160 | ||
161 | while (1) { | |
162 | /* | |
163 | * In this loop we process fcopy messages after the | |
164 | * handshake is complete. | |
165 | */ | |
166 | len = pread(fcopy_fd, buffer, (4096 * 2), 0); | |
167 | if (len < 0) { | |
168 | syslog(LOG_ERR, "pread failed: %s", strerror(errno)); | |
169 | exit(EXIT_FAILURE); | |
170 | } | |
171 | in_msg = (struct hv_fcopy_hdr *)buffer; | |
172 | ||
173 | switch (in_msg->operation) { | |
174 | case START_FILE_COPY: | |
175 | error = hv_start_fcopy((struct hv_start_fcopy *)in_msg); | |
176 | break; | |
177 | case WRITE_TO_FILE: | |
178 | error = hv_copy_data((struct hv_do_fcopy *)in_msg); | |
179 | break; | |
180 | case COMPLETE_FCOPY: | |
181 | error = hv_copy_finished(); | |
182 | break; | |
183 | case CANCEL_FCOPY: | |
184 | error = hv_copy_cancel(); | |
185 | break; | |
186 | ||
187 | default: | |
188 | syslog(LOG_ERR, "Unknown operation: %d", | |
189 | in_msg->operation); | |
190 | ||
191 | } | |
192 | ||
193 | if (pwrite(fcopy_fd, &error, sizeof(int), 0) != sizeof(int)) { | |
194 | syslog(LOG_ERR, "pwrite failed: %s", strerror(errno)); | |
195 | exit(EXIT_FAILURE); | |
196 | } | |
197 | } | |
198 | } |