1 /*- 2 * Copyright (c) 1991 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 static char sccsid[] = "@(#)utils.c 5.2 (Berkeley) 06/01/92"; 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 #include <fcntl.h> 17 #include <errno.h> 18 #include <unistd.h> 19 #include <stdio.h> 20 #include <stdlib.h> 21 #include <fts.h> 22 #include "extern.h" 23 24 void 25 copy_file(entp, dne) 26 FTSENT *entp; 27 int dne; 28 { 29 static char buf[MAXBSIZE]; 30 register int from_fd, to_fd, rcount, wcount; 31 struct stat to_stat, *fs; 32 char *p; 33 34 35 if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) { 36 err("%s: %s", entp->fts_path, strerror(errno)); 37 return; 38 } 39 40 fs = entp->fts_statp; 41 42 /* 43 * If the file exists and we're interactive, verify with the user. 44 * If the file DNE, set the mode to be the from file, minus setuid 45 * bits, modified by the umask; arguably wrong, but it makes copying 46 * executables work right and it's been that way forever. (The 47 * other choice is 666 or'ed with the execute bits on the from file 48 * modified by the umask.) 49 */ 50 if (!dne) { 51 if (iflag) { 52 int checkch, ch; 53 54 (void)fprintf(stderr, "overwrite %s? ", to.p_path); 55 checkch = ch = getchar(); 56 while (ch != '\n' && ch != EOF) 57 ch = getchar(); 58 if (checkch != 'y') { 59 (void)close(from_fd); 60 return; 61 } 62 } 63 to_fd = open(to.p_path, O_WRONLY|O_TRUNC, 0); 64 } else 65 to_fd = open(to.p_path, O_WRONLY|O_CREAT|O_TRUNC, 66 fs->st_mode & ~(S_ISUID|S_ISGID)); 67 68 if (to_fd == -1) { 69 err("%s: %s", to.p_path, strerror(errno)); 70 (void)close(from_fd); 71 return; 72 } 73 74 /* 75 * Mmap and write if less than 8M (the limit is so we don't totally 76 * trash memory on big files. This is really a minor hack, but it 77 * wins some CPU back. 78 */ 79 if (fs->st_size <= 8 * 1048576) { 80 if ((p = mmap(NULL, fs->st_size, PROT_READ, 81 MAP_FILE, from_fd, (off_t)0)) == (char *)-1) 82 err("%s: %s", entp->fts_path, strerror(errno)); 83 if (write(to_fd, p, fs->st_size) != fs->st_size) 84 err("%s: %s", to.p_path, strerror(errno)); 85 } else { 86 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 87 wcount = write(to_fd, buf, rcount); 88 if (rcount != wcount || wcount == -1) { 89 err("%s: %s", to.p_path, strerror(errno)); 90 break; 91 } 92 } 93 if (rcount < 0) 94 err("%s: %s", entp->fts_path, strerror(errno)); 95 } 96 if (pflag) 97 setfile(fs, to_fd); 98 /* 99 * If the source was setuid or setgid, lose the bits unless the 100 * copy is owned by the same user and group. 101 */ 102 else if (fs->st_mode & (S_ISUID|S_ISGID) && fs->st_uid == myuid) 103 if (fstat(to_fd, &to_stat)) 104 err("%s: %s", to.p_path, strerror(errno)); 105 #define RETAINBITS (S_ISUID|S_ISGID|S_ISVTX|S_IRWXU|S_IRWXG|S_IRWXO) 106 else if (fs->st_gid == to_stat.st_gid && fchmod(to_fd, 107 fs->st_mode & RETAINBITS & ~myumask)) 108 err("%s: %s", to.p_path, strerror(errno)); 109 (void)close(from_fd); 110 if (close(to_fd)) 111 err("%s: %s", to.p_path, strerror(errno)); 112 } 113 114 void 115 copy_link(p, exists) 116 FTSENT *p; 117 int exists; 118 { 119 int len; 120 char link[MAXPATHLEN]; 121 122 if ((len = readlink(p->fts_path, link, sizeof(link))) == -1) { 123 err("readlink: %s: %s", p->fts_path, strerror(errno)); 124 return; 125 } 126 link[len] = '\0'; 127 if (exists && unlink(to.p_path)) { 128 err("unlink: %s: %s", to.p_path, strerror(errno)); 129 return; 130 } 131 if (symlink(link, to.p_path)) { 132 err("symlink: %s: %s", link, strerror(errno)); 133 return; 134 } 135 } 136 137 void 138 copy_fifo(from_stat, exists) 139 struct stat *from_stat; 140 int exists; 141 { 142 if (exists && unlink(to.p_path)) { 143 err("unlink: %s: %s", to.p_path, strerror(errno)); 144 return; 145 } 146 if (mkfifo(to.p_path, from_stat->st_mode)) { 147 err("mkfifo: %s: %s", to.p_path, strerror(errno)); 148 return; 149 } 150 if (pflag) 151 setfile(from_stat, 0); 152 } 153 154 void 155 copy_special(from_stat, exists) 156 struct stat *from_stat; 157 int exists; 158 { 159 if (exists && unlink(to.p_path)) { 160 err("unlink: %s: %s", to.p_path, strerror(errno)); 161 return; 162 } 163 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 164 err("mknod: %s: %s", to.p_path, strerror(errno)); 165 return; 166 } 167 if (pflag) 168 setfile(from_stat, 0); 169 } 170 171 172 void 173 setfile(fs, fd) 174 register struct stat *fs; 175 int fd; 176 { 177 static struct timeval tv[2]; 178 179 fs->st_mode &= S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO; 180 181 tv[0].tv_sec = fs->st_atime; 182 tv[1].tv_sec = fs->st_mtime; 183 if (utimes(to.p_path, tv)) 184 err("utimes: %s: %s", to.p_path, strerror(errno)); 185 /* 186 * Changing the ownership probably won't succeed, unless we're root 187 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 188 * the mode; current BSD behavior is to remove all setuid bits on 189 * chown. If chown fails, lose setuid/setgid bits. 190 */ 191 if (fd ? fchown(fd, fs->st_uid, fs->st_gid) : 192 chown(to.p_path, fs->st_uid, fs->st_gid)) { 193 if (errno != EPERM) 194 err("chown: %s: %s", to.p_path, strerror(errno)); 195 fs->st_mode &= ~(S_ISUID|S_ISGID); 196 } 197 if (fd ? fchmod(fd, fs->st_mode) : chmod(to.p_path, fs->st_mode)) 198 err("chown: %s: %s", to.p_path, strerror(errno)); 199 } 200 201 void 202 usage() 203 { 204 (void)fprintf(stderr, 205 "usage: cp [-HRfhip] src target;\n cp [-HRfhip] src1 ... srcN directory\n"); 206 exit(1); 207 } 208 209 #if __STDC__ 210 #include <stdarg.h> 211 #else 212 #include <varargs.h> 213 #endif 214 215 void 216 #if __STDC__ 217 err(const char *fmt, ...) 218 #else 219 err(fmt, va_alist) 220 char *fmt; 221 va_dcl 222 #endif 223 { 224 va_list ap; 225 #if __STDC__ 226 va_start(ap, fmt); 227 #else 228 va_start(ap); 229 #endif 230 (void)fprintf(stderr, "%s: ", progname); 231 (void)vfprintf(stderr, fmt, ap); 232 va_end(ap); 233 (void)fprintf(stderr, "\n"); 234 exit_val = 1; 235 } 236