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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 | |
73 | if (!have_authorization) | |
74 | { | |
85330553 | 75 | send_int(conn, MR_PERM); |
5eaef520 | 76 | return 1; |
de56407f | 77 | } |
5eaef520 | 78 | if (setuid(uid) < 0) |
79 | { | |
80 | com_err(whoami, errno, "Unable to setuid to %d\n", uid); | |
81 | exit(1); | |
35fd45e2 | 82 | } |
85330553 | 83 | |
5eaef520 | 84 | /* unlink old file */ |
85 | if (!config_lookup("noclobber")) | |
86 | unlink(pathname); | |
87 | /* open file descriptor */ | |
88 | fd = open(pathname, O_CREAT|O_EXCL|O_WRONLY, mode); | |
89 | if (fd == -1) | |
90 | { | |
91 | code = errno; | |
85330553 | 92 | com_err(whoami, errno, "creating file %s (get_file)", pathname); |
93 | send_int(conn, code); | |
5eaef520 | 94 | return 1; |
de56407f | 95 | } |
85330553 | 96 | |
5eaef520 | 97 | /* check to see if we've got the disk space */ |
98 | n_written = 0; | |
99 | while (n_written < file_size) | |
100 | { | |
44d12d58 | 101 | int n_wrote; |
5eaef520 | 102 | n_wrote = write(fd, buf, sizeof(buf)); |
103 | if (n_wrote == -1) | |
104 | { | |
105 | code = errno; | |
85330553 | 106 | com_err(whoami, code, "verifying free disk space for %s (get_file)", |
107 | pathname); | |
108 | send_int(conn, code); | |
109 | ||
5eaef520 | 110 | /* do all we can to free the space */ |
111 | unlink(pathname); | |
112 | ftruncate(fd, 0); | |
113 | close(fd); | |
5eaef520 | 114 | return 1; |
de56407f | 115 | } |
5eaef520 | 116 | n_written += n_wrote; |
de56407f | 117 | } |
85330553 | 118 | |
7ac48069 | 119 | lseek(fd, 0, SEEK_SET); |
85330553 | 120 | send_ok(conn); |
121 | ||
5eaef520 | 122 | if (encrypt) |
123 | { | |
124 | des_key_sched(session, sched); | |
125 | memcpy(ivec, session, sizeof(ivec)); | |
d599d457 | 126 | } |
85330553 | 127 | |
5eaef520 | 128 | n_written = 0; |
85330553 | 129 | while (n_written < file_size) |
5eaef520 | 130 | { |
85330553 | 131 | int n_got = get_block(conn, fd, file_size - n_written, encrypt); |
132 | ||
5eaef520 | 133 | if (n_got == -1) |
134 | { | |
135 | /* get_block has already printed a message */ | |
136 | unlink(pathname); | |
5eaef520 | 137 | return 1; |
138 | } | |
139 | n_written += n_got; | |
140 | if (n_written != file_size) | |
85330553 | 141 | send_ok(conn); |
de56407f | 142 | } |
85330553 | 143 | |
5eaef520 | 144 | fsync(fd); |
145 | ftruncate(fd, file_size); | |
146 | fsync(fd); | |
147 | close(fd); | |
85330553 | 148 | |
5eaef520 | 149 | /* validate checksum */ |
150 | found_checksum = checksum_file(pathname); | |
151 | if (checksum != found_checksum) | |
152 | { | |
153 | code = MR_MISSINGFILE; | |
154 | com_err(whoami, code, ": expected = %d, found = %d", | |
155 | checksum, found_checksum); | |
85330553 | 156 | send_int(conn, code); |
5eaef520 | 157 | return 1; |
de56407f | 158 | } |
85330553 | 159 | |
160 | send_ok(conn); | |
5eaef520 | 161 | return 0; |
de56407f | 162 | } |
163 | ||
85330553 | 164 | static int get_block(int conn, int fd, int max_size, int encrypt) |
de56407f | 165 | { |
85330553 | 166 | char *data; |
167 | size_t len; | |
168 | int n_read, n, i, code; | |
de56407f | 169 | |
85330553 | 170 | recv_string(conn, &data, &len); |
32df7737 | 171 | |
5eaef520 | 172 | if (encrypt) |
173 | { | |
85330553 | 174 | char *unenc = malloc(len); |
175 | ||
176 | if (!unenc) | |
177 | { | |
178 | send_int(conn, ENOMEM); | |
179 | return -1; | |
180 | } | |
181 | ||
182 | des_pcbc_encrypt(data, unenc, len, sched, ivec, 1); | |
5eaef520 | 183 | for (i = 0; i < 8; i++) |
85330553 | 184 | ivec[i] = data[len - 8 + i] ^ unenc[len - 8 + i]; |
185 | free(data); | |
186 | data = unenc; | |
32df7737 | 187 | } |
188 | ||
85330553 | 189 | n_read = MIN(len, max_size); |
5eaef520 | 190 | n = 0; |
191 | while (n < n_read) | |
192 | { | |
44d12d58 | 193 | int n_wrote; |
85330553 | 194 | n_wrote = write(fd, data + n, n_read - n); |
5eaef520 | 195 | if (n_wrote == -1) |
196 | { | |
197 | code = errno; | |
85330553 | 198 | com_err(whoami, errno, "writing file (get_file)"); |
199 | send_int(conn, code); | |
200 | free(data); | |
5eaef520 | 201 | close(fd); |
202 | return -1; | |
de56407f | 203 | } |
5eaef520 | 204 | n += n_wrote; |
de56407f | 205 | } |
85330553 | 206 | free(data); |
5eaef520 | 207 | return n; |
de56407f | 208 | } |