1 /*- 2 * Copyright (c) 1991, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 static char sccsid[] = "@(#)utils.c 8.3 (Berkeley) 04/01/94"; 10 #endif /* not lint */ 11 12 #include <sys/param.h> 13 #include <sys/stat.h> 14 #include <sys/mman.h> 15 #include <sys/time.h> 16 17 #include <err.h> 18 #include <errno.h> 19 #include <fcntl.h> 20 #include <fts.h> 21 #include <stdio.h> 22 #include <stdlib.h> 23 #include <string.h> 24 #include <unistd.h> 25 26 #include "extern.h" 27 28 int 29 copy_file(entp, dne) 30 FTSENT *entp; 31 int dne; 32 { 33 static char buf[MAXBSIZE]; 34 struct stat to_stat, *fs; 35 int ch, checkch, from_fd, rcount, rval, to_fd, wcount; 36 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 37 char *p; 38 #endif 39 40 if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) { 41 warn("%s", entp->fts_path); 42 return (1); 43 } 44 45 fs = entp->fts_statp; 46 47 /* 48 * If the file exists and we're interactive, verify with the user. 49 * If the file DNE, set the mode to be the from file, minus setuid 50 * bits, modified by the umask; arguably wrong, but it makes copying 51 * executables work right and it's been that way forever. (The 52 * other choice is 666 or'ed with the execute bits on the from file 53 * modified by the umask.) 54 */ 55 if (!dne) { 56 if (iflag) { 57 (void)fprintf(stderr, "overwrite %s? ", to.p_path); 58 checkch = ch = getchar(); 59 while (ch != '\n' && ch != EOF) 60 ch = getchar(); 61 if (checkch != 'y') { 62 (void)close(from_fd); 63 return (0); 64 } 65 } 66 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 67 } else 68 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 69 fs->st_mode & ~(S_ISUID | S_ISGID)); 70 71 if (to_fd == -1) { 72 warn("%s", to.p_path); 73 (void)close(from_fd); 74 return (1);; 75 } 76 77 rval = 0; 78 79 /* 80 * Mmap and write if less than 8M (the limit is so we don't totally 81 * trash memory on big files. This is really a minor hack, but it 82 * wins some CPU back. 83 */ 84 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 85 if (fs->st_size <= 8 * 1048576) { 86 if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ, 87 0, from_fd, (off_t)0)) == (char *)-1) { 88 warn("%s", entp->fts_path); 89 rval = 1; 90 } else { 91 if (write(to_fd, p, fs->st_size) != fs->st_size) { 92 warn("%s", to.p_path); 93 rval = 1; 94 } 95 /* Some systems don't unmap on close(2). */ 96 if (munmap(p, fs->st_size) < 0) { 97 warn("%s", entp->fts_path); 98 rval = 1; 99 } 100 } 101 } else 102 #endif 103 { 104 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 105 wcount = write(to_fd, buf, rcount); 106 if (rcount != wcount || wcount == -1) { 107 warn("%s", to.p_path); 108 rval = 1; 109 break; 110 } 111 } 112 if (rcount < 0) { 113 warn("%s", entp->fts_path); 114 rval = 1; 115 } 116 } 117 118 /* If the copy went bad, lose the file. */ 119 if (rval == 1) { 120 (void)unlink(to.p_path); 121 (void)close(from_fd); 122 (void)close(to_fd); 123 return (1); 124 } 125 126 if (pflag && setfile(fs, to_fd)) 127 rval = 1; 128 /* 129 * If the source was setuid or setgid, lose the bits unless the 130 * copy is owned by the same user and group. 131 */ 132 #define RETAINBITS \ 133 (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO) 134 else if (fs->st_mode & (S_ISUID | S_ISGID) && fs->st_uid == myuid) 135 if (fstat(to_fd, &to_stat)) { 136 warn("%s", to.p_path); 137 rval = 1; 138 } else if (fs->st_gid == to_stat.st_gid && 139 fchmod(to_fd, fs->st_mode & RETAINBITS & ~myumask)) { 140 warn("%s", to.p_path); 141 rval = 1; 142 } 143 (void)close(from_fd); 144 if (close(to_fd)) { 145 warn("%s", to.p_path); 146 rval = 1; 147 } 148 return (rval); 149 } 150 151 int 152 copy_link(p, exists) 153 FTSENT *p; 154 int exists; 155 { 156 int len; 157 char link[MAXPATHLEN]; 158 159 if ((len = readlink(p->fts_path, link, sizeof(link))) == -1) { 160 warn("readlink: %s", p->fts_path); 161 return (1); 162 } 163 link[len] = '\0'; 164 if (exists && unlink(to.p_path)) { 165 warn("unlink: %s", to.p_path); 166 return (1); 167 } 168 if (symlink(link, to.p_path)) { 169 warn("symlink: %s", link); 170 return (1); 171 } 172 return (0); 173 } 174 175 int 176 copy_fifo(from_stat, exists) 177 struct stat *from_stat; 178 int exists; 179 { 180 if (exists && unlink(to.p_path)) { 181 warn("unlink: %s", to.p_path); 182 return (1); 183 } 184 if (mkfifo(to.p_path, from_stat->st_mode)) { 185 warn("mkfifo: %s", to.p_path); 186 return (1); 187 } 188 return (pflag ? setfile(from_stat, 0) : 0); 189 } 190 191 int 192 copy_special(from_stat, exists) 193 struct stat *from_stat; 194 int exists; 195 { 196 if (exists && unlink(to.p_path)) { 197 warn("unlink: %s", to.p_path); 198 return (1); 199 } 200 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 201 warn("mknod: %s", to.p_path); 202 return (1); 203 } 204 return (pflag ? setfile(from_stat, 0) : 0); 205 } 206 207 208 int 209 setfile(fs, fd) 210 register struct stat *fs; 211 int fd; 212 { 213 static struct timeval tv[2]; 214 int rval; 215 216 rval = 0; 217 fs->st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO; 218 219 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec); 220 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec); 221 if (utimes(to.p_path, tv)) { 222 warn("utimes: %s", to.p_path); 223 rval = 1; 224 } 225 /* 226 * Changing the ownership probably won't succeed, unless we're root 227 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 228 * the mode; current BSD behavior is to remove all setuid bits on 229 * chown. If chown fails, lose setuid/setgid bits. 230 */ 231 if (fd ? fchown(fd, fs->st_uid, fs->st_gid) : 232 chown(to.p_path, fs->st_uid, fs->st_gid)) { 233 if (errno != EPERM) { 234 warn("chown: %s", to.p_path); 235 rval = 1; 236 } 237 fs->st_mode &= ~(S_ISUID | S_ISGID); 238 } 239 if (fd ? fchmod(fd, fs->st_mode) : chmod(to.p_path, fs->st_mode)) { 240 warn("chown: %s", to.p_path); 241 rval = 1; 242 } 243 244 if (fd ? 245 fchflags(fd, fs->st_flags) : chflags(to.p_path, fs->st_flags)) { 246 warn("chflags: %s", to.p_path); 247 rval = 1; 248 } 249 return (rval); 250 } 251 252 void 253 usage() 254 { 255 (void)fprintf(stderr, "%s\n%s\n", 256 "usage: cp [-R [-H | -L | -P] [-fip] src target", 257 " cp [-R [-H | -L | -P] [-fip] src1 ... srcN directory"); 258 exit(1); 259 } 260