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