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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 | |
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); |
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; |
98 | done: |
99 | return error; |
100 | } |
101 | |
102 | static 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 | |
115 | static int hv_copy_finished(void) |
116 | { |
117 | close(target_fd); |
118 | return 0; |
119 | } |
120 | static int hv_copy_cancel(void) |
121 | { |
122 | close(target_fd); |
123 | unlink(target_fname); |
124 | return 0; |
125 | |
126 | } |
127 | |
128 | int 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 | } |
198 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9