]>
Commit | Line | Data |
---|---|---|
7ac48069 | 1 | /* $Id$ |
2 | * | |
3 | * Copyright (C) 1988-1998 by the Massachusetts Institute of Technology. | |
4 | * For copying and distribution information, please see the file | |
5 | * <mit-copyright.h>. | |
de56407f | 6 | */ |
de56407f | 7 | |
546bc43b | 8 | #include <mit-copyright.h> |
2ad0a777 | 9 | #include <moira.h> |
7ac48069 | 10 | #include "update_server.h" |
de56407f | 11 | #include "update.h" |
de56407f | 12 | |
7ac48069 | 13 | #include <errno.h> |
14 | #include <fcntl.h> | |
15 | #include <stdio.h> | |
85330553 | 16 | #include <stdlib.h> |
eedd0489 | 17 | #include <string.h> |
7ac48069 | 18 | #include <unistd.h> |
19 | ||
20 | #include <des.h> | |
7ac48069 | 21 | |
22 | RCSID("$Header$"); | |
23 | ||
7b18e95b | 24 | #ifndef MIN |
5eaef520 | 25 | #define MIN(a, b) (((a) < (b)) ? (a) : (b)) |
7b18e95b | 26 | #endif /* MIN */ |
27 | ||
d599d457 | 28 | static des_key_schedule sched; |
29 | static des_cblock ivec; | |
85330553 | 30 | extern des_cblock session; |
de56407f | 31 | |
85330553 | 32 | static int get_block(int conn, int fd, int max_size, int encrypt); |
de56407f | 33 | |
34 | /* | |
35 | * get_file() | |
36 | * | |
37 | * arguments: | |
38 | * char *pathname | |
39 | * file to receive | |
40 | * int file_size | |
41 | * number of bytes | |
42 | * int checksum | |
43 | * linear checksum of bytes | |
44 | * | |
45 | * syntax: | |
46 | * (initial protocol already done) | |
47 | * <<< (int)code (can we accept the file?) | |
48 | * >>> (STRING)data | |
49 | * <<< (int)code | |
50 | * >>> (STRING)data | |
51 | * <<< (int)code | |
52 | * ... | |
53 | * >>> (STRING)data (last data block) | |
54 | * <<< (int)code (from read, write, checksum verify) | |
55 | * | |
56 | * returns: | |
57 | * int | |
58 | * 0 for success, 1 for failure | |
59 | * | |
60 | * function: | |
61 | * perform initial preparations and receive file as | |
62 | * a single string, storing it into <pathname> | |
63 | * | |
64 | */ | |
65 | ||
85330553 | 66 | int get_file(int conn, char *pathname, int file_size, int checksum, |
5eaef520 | 67 | int mode, int encrypt) |
de56407f | 68 | { |
85330553 | 69 | int fd, n_written, code; |
5eaef520 | 70 | int found_checksum; |
85330553 | 71 | char buf[BUFSIZ]; |
5eaef520 | 72 | |
0a01a5a4 | 73 | memset(buf, '\0', sizeof(buf)); |
74 | ||
5eaef520 | 75 | if (!have_authorization) |
76 | { | |
85330553 | 77 | send_int(conn, MR_PERM); |
5eaef520 | 78 | return 1; |
de56407f | 79 | } |
5eaef520 | 80 | if (setuid(uid) < 0) |
81 | { | |
82 | com_err(whoami, errno, "Unable to setuid to %d\n", uid); | |
83 | exit(1); | |
35fd45e2 | 84 | } |
85330553 | 85 | |
5eaef520 | 86 | /* unlink old file */ |
87 | if (!config_lookup("noclobber")) | |
88 | unlink(pathname); | |
89 | /* open file descriptor */ | |
90 | fd = open(pathname, O_CREAT|O_EXCL|O_WRONLY, mode); | |
91 | if (fd == -1) | |
92 | { | |
93 | code = errno; | |
85330553 | 94 | com_err(whoami, errno, "creating file %s (get_file)", pathname); |
95 | send_int(conn, code); | |
5eaef520 | 96 | return 1; |
de56407f | 97 | } |
85330553 | 98 | |
5eaef520 | 99 | /* check to see if we've got the disk space */ |
100 | n_written = 0; | |
101 | while (n_written < file_size) | |
102 | { | |
44d12d58 | 103 | int n_wrote; |
5eaef520 | 104 | n_wrote = write(fd, buf, sizeof(buf)); |
105 | if (n_wrote == -1) | |
106 | { | |
107 | code = errno; | |
85330553 | 108 | com_err(whoami, code, "verifying free disk space for %s (get_file)", |
109 | pathname); | |
110 | send_int(conn, code); | |
111 | ||
5eaef520 | 112 | /* do all we can to free the space */ |
113 | unlink(pathname); | |
114 | ftruncate(fd, 0); | |
115 | close(fd); | |
5eaef520 | 116 | return 1; |
de56407f | 117 | } |
5eaef520 | 118 | n_written += n_wrote; |
de56407f | 119 | } |
85330553 | 120 | |
7ac48069 | 121 | lseek(fd, 0, SEEK_SET); |
85330553 | 122 | send_ok(conn); |
123 | ||
5eaef520 | 124 | if (encrypt) |
125 | { | |
126 | des_key_sched(session, sched); | |
127 | memcpy(ivec, session, sizeof(ivec)); | |
d599d457 | 128 | } |
85330553 | 129 | |
5eaef520 | 130 | n_written = 0; |
85330553 | 131 | while (n_written < file_size) |
5eaef520 | 132 | { |
85330553 | 133 | int n_got = get_block(conn, fd, file_size - n_written, encrypt); |
134 | ||
5eaef520 | 135 | if (n_got == -1) |
136 | { | |
137 | /* get_block has already printed a message */ | |
138 | unlink(pathname); | |
5eaef520 | 139 | return 1; |
140 | } | |
141 | n_written += n_got; | |
142 | if (n_written != file_size) | |
85330553 | 143 | send_ok(conn); |
de56407f | 144 | } |
85330553 | 145 | |
5eaef520 | 146 | fsync(fd); |
147 | ftruncate(fd, file_size); | |
148 | fsync(fd); | |
149 | close(fd); | |
85330553 | 150 | |
5eaef520 | 151 | /* validate checksum */ |
152 | found_checksum = checksum_file(pathname); | |
153 | if (checksum != found_checksum) | |
154 | { | |
155 | code = MR_MISSINGFILE; | |
156 | com_err(whoami, code, ": expected = %d, found = %d", | |
157 | checksum, found_checksum); | |
85330553 | 158 | send_int(conn, code); |
5eaef520 | 159 | return 1; |
de56407f | 160 | } |
85330553 | 161 | |
162 | send_ok(conn); | |
5eaef520 | 163 | return 0; |
de56407f | 164 | } |
165 | ||
85330553 | 166 | static int get_block(int conn, int fd, int max_size, int encrypt) |
de56407f | 167 | { |
85330553 | 168 | char *data; |
169 | size_t len; | |
170 | int n_read, n, i, code; | |
de56407f | 171 | |
85330553 | 172 | recv_string(conn, &data, &len); |
32df7737 | 173 | |
5eaef520 | 174 | if (encrypt) |
175 | { | |
85330553 | 176 | char *unenc = malloc(len); |
177 | ||
178 | if (!unenc) | |
179 | { | |
180 | send_int(conn, ENOMEM); | |
181 | return -1; | |
182 | } | |
183 | ||
184 | des_pcbc_encrypt(data, unenc, len, sched, ivec, 1); | |
5eaef520 | 185 | for (i = 0; i < 8; i++) |
85330553 | 186 | ivec[i] = data[len - 8 + i] ^ unenc[len - 8 + i]; |
187 | free(data); | |
188 | data = unenc; | |
32df7737 | 189 | } |
190 | ||
85330553 | 191 | n_read = MIN(len, max_size); |
5eaef520 | 192 | n = 0; |
193 | while (n < n_read) | |
194 | { | |
44d12d58 | 195 | int n_wrote; |
85330553 | 196 | n_wrote = write(fd, data + n, n_read - n); |
5eaef520 | 197 | if (n_wrote == -1) |
198 | { | |
199 | code = errno; | |
85330553 | 200 | com_err(whoami, errno, "writing file (get_file)"); |
201 | send_int(conn, code); | |
202 | free(data); | |
5eaef520 | 203 | close(fd); |
204 | return -1; | |
de56407f | 205 | } |
5eaef520 | 206 | n += n_wrote; |
de56407f | 207 | } |
85330553 | 208 | free(data); |
5eaef520 | 209 | return n; |
de56407f | 210 | } |