/* * scp - secure remote copy. This is basically patched BSD rcp which * uses ssh to do the data transfer (instead of using rcmd). * * NOTE: This version should NOT be suid root. (This uses ssh to * do the transfer and ssh has the necessary privileges.) * * 1995 Timo Rinne , Tatu Ylonen * * As far as I am concerned, the code I have written for this software * can be used freely for any purpose. Any derived versions of this * software must be clearly marked as such, and if the derived work is * incompatible with the protocol description in the RFC file, it must be * called by a name other than "ssh" or "Secure Shell". */ /* * Copyright (c) 1999 Theo de Raadt. All rights reserved. * Copyright (c) 1999 Aaron Campbell. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* * Parts from: * * Copyright (c) 1983, 1990, 1992, 1993, 1995 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * */ #include "includes.h" RCSID("$OpenBSD: scp.c,v 1.108 2003/07/18 01:54:25 deraadt Exp $"); #include "xmalloc.h" #include "atomicio.h" #include "pathnames.h" #include "log.h" #include "misc.h" #include "progressmeter.h" int do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout, int argc); void bwlimit(int); /* Struct for addargs */ arglist args; /* Bandwidth limit */ off_t limit = 0; /* Name of current file being transferred. */ char *curfile; /* This is set to non-zero to enable verbose mode. */ int verbose_mode = 0; /* This is set to zero if the progressmeter is not desired. */ int showprogress = 1; /* This is the program to execute for the secured connection. ("ssh" or -S) */ char *ssh_program = _PATH_SSH_PROGRAM; /* This is used to store the pid of ssh_program */ pid_t do_cmd_pid = -1; static void killchild(int signo) { if (do_cmd_pid > 1) kill(do_cmd_pid, signo); _exit(1); } /* * This function executes the given command as the specified user on the * given host. This returns < 0 if execution fails, and >= 0 otherwise. This * assigns the input and output file descriptors on success. */ int do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout, int argc) { int pin[2], pout[2], reserved[2]; if (verbose_mode) fprintf(stderr, "Executing: program %s host %s, user %s, command %s\n", ssh_program, host, remuser ? remuser : "(unspecified)", cmd); /* * Reserve two descriptors so that the real pipes won't get * descriptors 0 and 1 because that will screw up dup2 below. */ pipe(reserved); /* Create a socket pair for communicating with ssh. */ if (pipe(pin) < 0) fatal("pipe: %s", strerror(errno)); if (pipe(pout) < 0) fatal("pipe: %s", strerror(errno)); /* Free the reserved descriptors. */ close(reserved[0]); close(reserved[1]); /* Fork a child to execute the command on the remote host using ssh. */ do_cmd_pid = fork(); if (do_cmd_pid == 0) { /* Child. */ close(pin[1]); close(pout[0]); dup2(pin[0], 0); dup2(pout[1], 1); close(pin[0]); close(pout[1]); args.list[0] = ssh_program; if (remuser != NULL) addargs(&args, "-l%s", remuser); addargs(&args, "%s", host); addargs(&args, "%s", cmd); execvp(ssh_program, args.list); perror(ssh_program); exit(1); } else if (do_cmd_pid == -1) { fatal("fork: %s", strerror(errno)); } /* Parent. Close the other side, and return the local side. */ close(pin[0]); *fdout = pin[1]; close(pout[1]); *fdin = pout[0]; signal(SIGTERM, killchild); signal(SIGINT, killchild); signal(SIGHUP, killchild); return 0; } typedef struct { int cnt; char *buf; } BUF; BUF *allocbuf(BUF *, int, int); void lostconn(int); void nospace(void); int okname(char *); void run_err(const char *,...); void verifydir(char *); struct passwd *pwd; uid_t userid; int errs, remin, remout; int pflag, iamremote, iamrecursive, targetshouldbedirectory; #define CMDNEEDS 64 char cmd[CMDNEEDS]; /* must hold "rcp -r -p -d\0" */ int response(void); void rsource(char *, struct stat *); void sink(int, char *[]); void source(int, char *[]); void tolocal(int, char *[]); void toremote(char *, int, char *[]); void usage(void); int main(int argc, char **argv) { int ch, fflag, tflag, status; double speed; char *targ, *endp; extern char *optarg; extern int optind; args.list = NULL; addargs(&args, "ssh"); /* overwritten with ssh_program */ addargs(&args, "-x"); addargs(&args, "-oForwardAgent no"); addargs(&args, "-oClearAllForwardings yes"); fflag = tflag = 0; while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q1246S:o:F:")) != -1) switch (ch) { /* User-visible flags. */ case '1': case '2': case '4': case '6': case 'C': addargs(&args, "-%c", ch); break; case 'o': case 'c': case 'i': case 'F': addargs(&args, "-%c%s", ch, optarg); break; case 'P': addargs(&args, "-p%s", optarg); break; case 'B': addargs(&args, "-oBatchmode yes"); break; case 'l': speed = strtod(optarg, &endp); if (speed <= 0 || *endp != '\0') usage(); limit = speed * 1024; break; case 'p': pflag = 1; break; case 'r': iamrecursive = 1; break; case 'S': ssh_program = xstrdup(optarg); break; case 'v': addargs(&args, "-v"); verbose_mode = 1; break; case 'q': showprogress = 0; break; /* Server options. */ case 'd': targetshouldbedirectory = 1; break; case 'f': /* "from" */ iamremote = 1; fflag = 1; break; case 't': /* "to" */ iamremote = 1; tflag = 1; break; default: usage(); } argc -= optind; argv += optind; if ((pwd = getpwuid(userid = getuid())) == NULL) fatal("unknown user %u", (u_int) userid); if (!isatty(STDERR_FILENO)) showprogress = 0; remin = STDIN_FILENO; remout = STDOUT_FILENO; if (fflag) { /* Follow "protocol", send data. */ (void) response(); source(argc, argv); exit(errs != 0); } if (tflag) { /* Receive data. */ sink(argc, argv); exit(errs != 0); } if (argc < 2) usage(); if (argc > 2) targetshouldbedirectory = 1; remin = remout = -1; do_cmd_pid = -1; /* Command to be executed on remote system using "ssh". */ (void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s", verbose_mode ? " -v" : "", iamrecursive ? " -r" : "", pflag ? " -p" : "", targetshouldbedirectory ? " -d" : ""); (void) signal(SIGPIPE, lostconn); if ((targ = colon(argv[argc - 1]))) /* Dest is remote host. */ toremote(targ, argc, argv); else { tolocal(argc, argv); /* Dest is local host. */ if (targetshouldbedirectory) verifydir(argv[argc - 1]); } /* * Finally check the exit status of the ssh process, if one was forked * and no error has occured yet */ if (do_cmd_pid != -1 && errs == 0) { if (remin != -1) (void) close(remin); if (remout != -1) (void) close(remout); if (waitpid(do_cmd_pid, &status, 0) == -1) errs = 1; else { if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) errs = 1; } } exit(errs != 0); } void toremote(char *targ, int argc, char **argv) { int i, len; char *bp, *host, *src, *suser, *thost, *tuser; *targ++ = 0; if (*targ == 0) targ = "."; if ((thost = strrchr(argv[argc - 1], '@'))) { /* user@host */ *thost++ = 0; tuser = argv[argc - 1]; if (*tuser == '\0') tuser = NULL; } else { thost = argv[argc - 1]; tuser = NULL; } for (i = 0; i < argc - 1; i++) { src = colon(argv[i]); if (src) { /* remote to remote */ static char *ssh_options = "-x -o'ClearAllForwardings yes'"; *src++ = 0; if (*src == 0) src = "."; host = strrchr(argv[i], '@'); len = strlen(ssh_program) + strlen(argv[i]) + strlen(src) + (tuser ? strlen(tuser) : 0) + strlen(thost) + strlen(targ) + strlen(ssh_options) + CMDNEEDS + 20; bp = xmalloc(len); if (host) { *host++ = 0; host = cleanhostname(host); suser = argv[i]; if (*suser == '\0') suser = pwd->pw_name; else if (!okname(suser)) { xfree(bp); continue; } if (tuser && !okname(tuser)) { xfree(bp); continue; } snprintf(bp, len, "%s%s %s -n " "-l %s %s %s %s '%s%s%s:%s'", ssh_program, verbose_mode ? " -v" : "", ssh_options, suser, host, cmd, src, tuser ? tuser : "", tuser ? "@" : "", thost, targ); } else { host = cleanhostname(argv[i]); snprintf(bp, len, "exec %s%s %s -n %s " "%s %s '%s%s%s:%s'", ssh_program, verbose_mode ? " -v" : "", ssh_options, host, cmd, src, tuser ? tuser : "", tuser ? "@" : "", thost, targ); } if (verbose_mode) fprintf(stderr, "Executing: %s\n", bp); (void) system(bp); (void) xfree(bp); } else { /* local to remote */ if (remin == -1) { len = strlen(targ) + CMDNEEDS + 20; bp = xmalloc(len); (void) snprintf(bp, len, "%s -t %s", cmd, targ); host = cleanhostname(thost); if (do_cmd(host, tuser, bp, &remin, &remout, argc) < 0) exit(1); if (response() < 0) exit(1); (void) xfree(bp); } source(1, argv + i); } } } void tolocal(int argc, char **argv) { int i, len; char *bp, *host, *src, *suser; for (i = 0; i < argc - 1; i++) { if (!(src = colon(argv[i]))) { /* Local to local. */ len = strlen(_PATH_CP) + strlen(argv[i]) + strlen(argv[argc - 1]) + 20; bp = xmalloc(len); (void) snprintf(bp, len, "exec %s%s%s %s %s", _PATH_CP, iamrecursive ? " -r" : "", pflag ? " -p" : "", argv[i], argv[argc - 1]); if (verbose_mode) fprintf(stderr, "Executing: %s\n", bp); if (system(bp)) ++errs; (void) xfree(bp); continue; } *src++ = 0; if (*src == 0) src = "."; if ((host = strrchr(argv[i], '@')) == NULL) { host = argv[i]; suser = NULL; } else { *host++ = 0; suser = argv[i]; if (*suser == '\0') suser = pwd->pw_name; } host = cleanhostname(host); len = strlen(src) + CMDNEEDS + 20; bp = xmalloc(len); (void) snprintf(bp, len, "%s -f %s", cmd, src); if (do_cmd(host, suser, bp, &remin, &remout, argc) < 0) { (void) xfree(bp); ++errs; continue; } xfree(bp); sink(1, argv + argc - 1); (void) close(remin); remin = remout = -1; } } void source(int argc, char **argv) { struct stat stb; static BUF buffer; BUF *bp; off_t i, amt, result, statbytes; int fd, haderr, indx; char *last, *name, buf[2048]; int len; for (indx = 0; indx < argc; ++indx) { name = argv[indx]; statbytes = 0; len = strlen(name); while (len > 1 && name[len-1] == '/') name[--len] = '\0'; if (strchr(name, '\n') != NULL) { run_err("%s: skipping, filename contains a newline", name); goto next; } if ((fd = open(name, O_RDONLY, 0)) < 0) goto syserr; if (fstat(fd, &stb) < 0) { syserr: run_err("%s: %s", name, strerror(errno)); goto next; } switch (stb.st_mode & S_IFMT) { case S_IFREG: break; case S_IFDIR: if (iamrecursive) { rsource(name, &stb); goto next; } /* FALLTHROUGH */ default: run_err("%s: not a regular file", name); goto next; } if ((last = strrchr(name, '/')) == NULL) last = name; else ++last; curfile = last; if (pflag) { /* * Make it compatible with possible future * versions expecting microseconds. */ (void) snprintf(buf, sizeof buf, "T%lu 0 %lu 0\n", (u_long) stb.st_mtime, (u_long) stb.st_atime); (void) atomicio(vwrite, remout, buf, strlen(buf)); if (response() < 0) goto next; } #define FILEMODEMASK (S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO) snprintf(buf, sizeof buf, "C%04o %lld %s\n", (u_int) (stb.st_mode & FILEMODEMASK), (long long)stb.st_size, last); if (verbose_mode) { fprintf(stderr, "Sending file modes: %s", buf); } (void) atomicio(vwrite, remout, buf, strlen(buf)); if (response() < 0) goto next; if ((bp = allocbuf(&buffer, fd, 2048)) == NULL) { next: (void) close(fd); continue; } if (showprogress) start_progress_meter(curfile, stb.st_size, &statbytes); /* Keep writing after an error so that we stay sync'd up. */ for (haderr = i = 0; i < stb.st_size; i += bp->cnt) { amt = bp->cnt; if (i + amt > stb.st_size) amt = stb.st_size - i; if (!haderr) { result = atomicio(read, fd, bp->buf, amt); if (result != amt) haderr = result >= 0 ? EIO : errno; } if (haderr) (void) atomicio(vwrite, remout, bp->buf, amt); else { result = atomicio(vwrite, remout, bp->buf, amt); if (result != amt) haderr = result >= 0 ? EIO : errno; statbytes += result; } if (limit) bwlimit(amt); } if (showprogress) stop_progress_meter(); if (close(fd) < 0 && !haderr) haderr = errno; if (!haderr) (void) atomicio(vwrite, remout, "", 1); else run_err("%s: %s", name, strerror(haderr)); (void) response(); } } void rsource(char *name, struct stat *statp) { DIR *dirp; struct dirent *dp; char *last, *vect[1], path[1100]; if (!(dirp = opendir(name))) { run_err("%s: %s", name, strerror(errno)); return; } last = strrchr(name, '/'); if (last == 0) last = name; else last++; if (pflag) { (void) snprintf(path, sizeof(path), "T%lu 0 %lu 0\n", (u_long) statp->st_mtime, (u_long) statp->st_atime); (void) atomicio(vwrite, remout, path, strlen(path)); if (response() < 0) { closedir(dirp); return; } } (void) snprintf(path, sizeof path, "D%04o %d %.1024s\n", (u_int) (statp->st_mode & FILEMODEMASK), 0, last); if (verbose_mode) fprintf(stderr, "Entering directory: %s", path); (void) atomicio(vwrite, remout, path, strlen(path)); if (response() < 0) { closedir(dirp); return; } while ((dp = readdir(dirp)) != NULL) { if (dp->d_ino == 0) continue; if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, "..")) continue; if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) { run_err("%s/%s: name too long", name, dp->d_name); continue; } (void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name); vect[0] = path; source(1, vect); } (void) closedir(dirp); (void) atomicio(vwrite, remout, "E\n", 2); (void) response(); } void bwlimit(int amount) { static struct timeval bwstart, bwend; static int lamt, thresh = 16384; u_int64_t wait; struct timespec ts, rm; if (!timerisset(&bwstart)) { gettimeofday(&bwstart, NULL); return; } lamt += amount; if (lamt < thresh) return; gettimeofday(&bwend, NULL); timersub(&bwend, &bwstart, &bwend); if (!timerisset(&bwend)) return; lamt *= 8; wait = (double)1000000L * lamt / limit; bwstart.tv_sec = wait / 1000000L; bwstart.tv_usec = wait % 1000000L; if (timercmp(&bwstart, &bwend, >)) { timersub(&bwstart, &bwend, &bwend); /* Adjust the wait time */ if (bwend.tv_sec) { thresh /= 2; if (thresh < 2048) thresh = 2048; } else if (bwend.tv_usec < 100) { thresh *= 2; if (thresh > 32768) thresh = 32768; } TIMEVAL_TO_TIMESPEC(&bwend, &ts); while (nanosleep(&ts, &rm) == -1) { if (errno != EINTR) break; ts = rm; } } lamt = 0; gettimeofday(&bwstart, NULL); } void sink(int argc, char **argv) { static BUF buffer; struct stat stb; enum { YES, NO, DISPLAYED } wrerr; BUF *bp; off_t i, j; int amt, count, exists, first, mask, mode, ofd, omode; off_t size, statbytes; int setimes, targisdir, wrerrno = 0; char ch, *cp, *np, *targ, *why, *vect[1], buf[2048]; struct timeval tv[2]; #define atime tv[0] #define mtime tv[1] #define SCREWUP(str) do { why = str; goto screwup; } while (0) setimes = targisdir = 0; mask = umask(0); if (!pflag) (void) umask(mask); if (argc != 1) { run_err("ambiguous target"); exit(1); } targ = *argv; if (targetshouldbedirectory) verifydir(targ); (void) atomicio(vwrite, remout, "", 1); if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode)) targisdir = 1; for (first = 1;; first = 0) { cp = buf; if (atomicio(read, remin, cp, 1) <= 0) return; if (*cp++ == '\n') SCREWUP("unexpected "); do { if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch)) SCREWUP("lost connection"); *cp++ = ch; } while (cp < &buf[sizeof(buf) - 1] && ch != '\n'); *cp = 0; if (buf[0] == '\01' || buf[0] == '\02') { if (iamremote == 0) (void) atomicio(vwrite, STDERR_FILENO, buf + 1, strlen(buf + 1)); if (buf[0] == '\02') exit(1); ++errs; continue; } if (buf[0] == 'E') { (void) atomicio(vwrite, remout, "", 1); return; } if (ch == '\n') *--cp = 0; cp = buf; if (*cp == 'T') { setimes++; cp++; mtime.tv_sec = strtol(cp, &cp, 10); if (!cp || *cp++ != ' ') SCREWUP("mtime.sec not delimited"); mtime.tv_usec = strtol(cp, &cp, 10); if (!cp || *cp++ != ' ') SCREWUP("mtime.usec not delimited"); atime.tv_sec = strtol(cp, &cp, 10); if (!cp || *cp++ != ' ') SCREWUP("atime.sec not delimited"); atime.tv_usec = strtol(cp, &cp, 10); if (!cp || *cp++ != '\0') SCREWUP("atime.usec not delimited"); (void) atomicio(vwrite, remout, "", 1); continue; } if (*cp != 'C' && *cp != 'D') { /* * Check for the case "rcp remote:foo\* local:bar". * In this case, the line "No match." can be returned * by the shell before the rcp command on the remote is * executed so the ^Aerror_message convention isn't * followed. */ if (first) { run_err("%s", cp); exit(1); } SCREWUP("expected control record"); } mode = 0; for (++cp; cp < buf + 5; cp++) { if (*cp < '0' || *cp > '7') SCREWUP("bad mode"); mode = (mode << 3) | (*cp - '0'); } if (*cp++ != ' ') SCREWUP("mode not delimited"); for (size = 0; isdigit(*cp);) size = size * 10 + (*cp++ - '0'); if (*cp++ != ' ') SCREWUP("size not delimited"); if (targisdir) { static char *namebuf; static int cursize; size_t need; need = strlen(targ) + strlen(cp) + 250; if (need > cursize) { if (namebuf) xfree(namebuf); namebuf = xmalloc(need); cursize = need; } (void) snprintf(namebuf, need, "%s%s%s", targ, strcmp(targ, "/") ? "/" : "", cp); np = namebuf; } else np = targ; curfile = cp; exists = stat(np, &stb) == 0; if (buf[0] == 'D') { int mod_flag = pflag; if (exists) { if (!S_ISDIR(stb.st_mode)) { errno = ENOTDIR; goto bad; } if (pflag) (void) chmod(np, mode); } else { /* Handle copying from a read-only directory */ mod_flag = 1; if (mkdir(np, mode | S_IRWXU) < 0) goto bad; } vect[0] = xstrdup(np); sink(1, vect); if (setimes) { setimes = 0; if (utimes(vect[0], tv) < 0) run_err("%s: set times: %s", vect[0], strerror(errno)); } if (mod_flag) (void) chmod(vect[0], mode); if (vect[0]) xfree(vect[0]); continue; } omode = mode; mode |= S_IWRITE; if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) { bad: run_err("%s: %s", np, strerror(errno)); continue; } (void) atomicio(vwrite, remout, "", 1); if ((bp = allocbuf(&buffer, ofd, 4096)) == NULL) { (void) close(ofd); continue; } cp = bp->buf; wrerr = NO; statbytes = 0; if (showprogress) start_progress_meter(curfile, size, &statbytes); for (count = i = 0; i < size; i += 4096) { amt = 4096; if (i + amt > size) amt = size - i; count += amt; do { j = read(remin, cp, amt); if (j == -1 && (errno == EINTR || errno == EAGAIN)) { continue; } else if (j <= 0) { run_err("%s", j ? strerror(errno) : "dropped connection"); exit(1); } amt -= j; cp += j; statbytes += j; } while (amt > 0); if (limit) bwlimit(4096); if (count == bp->cnt) { /* Keep reading so we stay sync'd up. */ if (wrerr == NO) { j = atomicio(vwrite, ofd, bp->buf, count); if (j != count) { wrerr = YES; wrerrno = j >= 0 ? EIO : errno; } } count = 0; cp = bp->buf; } } if (showprogress) stop_progress_meter(); if (count != 0 && wrerr == NO && (j = atomicio(vwrite, ofd, bp->buf, count)) != count) { wrerr = YES; wrerrno = j >= 0 ? EIO : errno; } if (wrerr == NO && ftruncate(ofd, size) != 0) { run_err("%s: truncate: %s", np, strerror(errno)); wrerr = DISPLAYED; } if (pflag) { if (exists || omode != mode) if (fchmod(ofd, omode)) run_err("%s: set mode: %s", np, strerror(errno)); } else { if (!exists && omode != mode) if (fchmod(ofd, omode & ~mask)) run_err("%s: set mode: %s", np, strerror(errno)); } if (close(ofd) == -1) { wrerr = YES; wrerrno = errno; } (void) response(); if (setimes && wrerr == NO) { setimes = 0; if (utimes(np, tv) < 0) { run_err("%s: set times: %s", np, strerror(errno)); wrerr = DISPLAYED; } } switch (wrerr) { case YES: run_err("%s: %s", np, strerror(wrerrno)); break; case NO: (void) atomicio(vwrite, remout, "", 1); break; case DISPLAYED: break; } } screwup: run_err("protocol error: %s", why); exit(1); } int response(void) { char ch, *cp, resp, rbuf[2048]; if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp)) lostconn(0); cp = rbuf; switch (resp) { case 0: /* ok */ return (0); default: *cp++ = resp; /* FALLTHROUGH */ case 1: /* error, followed by error msg */ case 2: /* fatal error, "" */ do { if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch)) lostconn(0); *cp++ = ch; } while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n'); if (!iamremote) (void) atomicio(vwrite, STDERR_FILENO, rbuf, cp - rbuf); ++errs; if (resp == 1) return (-1); exit(1); } /* NOTREACHED */ } void usage(void) { (void) fprintf(stderr, "usage: scp [-pqrvBC1246] [-F config] [-S program] [-P port]\n" " [-c cipher] [-i identity] [-l limit] [-o option]\n" " [[user@]host1:]file1 [...] [[user@]host2:]file2\n"); exit(1); } void run_err(const char *fmt,...) { static FILE *fp; va_list ap; ++errs; if (fp == NULL && !(fp = fdopen(remout, "w"))) return; (void) fprintf(fp, "%c", 0x01); (void) fprintf(fp, "scp: "); va_start(ap, fmt); (void) vfprintf(fp, fmt, ap); va_end(ap); (void) fprintf(fp, "\n"); (void) fflush(fp); if (!iamremote) { va_start(ap, fmt); vfprintf(stderr, fmt, ap); va_end(ap); fprintf(stderr, "\n"); } } void verifydir(char *cp) { struct stat stb; if (!stat(cp, &stb)) { if (S_ISDIR(stb.st_mode)) return; errno = ENOTDIR; } run_err("%s: %s", cp, strerror(errno)); exit(1); } int okname(char *cp0) { int c; char *cp; cp = cp0; do { c = (int)*cp; if (c & 0200) goto bad; if (!isalpha(c) && !isdigit(c)) { switch (c) { case '\'': case '"': case '`': case ' ': case '#': goto bad; default: break; } } } while (*++cp); return (1); bad: fprintf(stderr, "%s: invalid user name\n", cp0); return (0); } BUF * allocbuf(BUF *bp, int fd, int blksize) { size_t size; struct stat stb; if (fstat(fd, &stb) < 0) { run_err("fstat: %s", strerror(errno)); return (0); } size = roundup(stb.st_blksize, blksize); if (size == 0) size = blksize; if (bp->cnt >= size) return (bp); if (bp->buf == NULL) bp->buf = xmalloc(size); else bp->buf = xrealloc(bp->buf, size); memset(bp->buf, 0, size); bp->cnt = size; return (bp); } void lostconn(int signo) { if (!iamremote) write(STDERR_FILENO, "lost connection\n", 16); if (signo) _exit(1); else exit(1); }