New libfetch-based fetch.

1 files changed, 644 insertions, 0 deletions

diff --git a/usr.bin/fetch/fetch.c b/usr.bin/fetch/fetch.c
new file mode 100644
index 0000000..d063100
--- /dev/null
+++ b/usr.bin/fetch/fetch.c
@@ -0,0 +1,644 @@
+/*-
+ * Copyright (c) 2000 Dag-Erling Coïdan Smørgrav
+ * 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
+ *    in this position and unchanged.
+ * 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. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission
+ *
+ * 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.
+ *
+ *	$FreeBSD$
+ */
+
+#include <sys/param.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+
+#include <ctype.h>
+#include <err.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sysexits.h>
+#include <unistd.h>
+
+#include <fetch.h>
+
+#define MINBUFSIZE	4096
+
+/* Option flags */
+int	 A_flag;	/*    -A: do not follow 302 redirects */
+int	 a_flag;	/*    -a: auto retry */
+size_t	 B_size;	/*    -B: buffer size */
+int	 b_flag;	/*!   -b: workaround TCP bug */
+int	 d_flag;	/*    -d: direct connection */
+int	 F_flag;	/*    -F: restart without checking mtime  */
+char	*f_filename;	/*    -f: file to fetch */
+int	 H_flag;	/*    -H: use high port */
+char	*h_hostname;	/*    -h: host to fetch from */
+int	 l_flag;	/*    -l: link rather than copy file: URLs */
+int	 m_flag;	/* -[Mm]: set local timestamp to remote timestamp */
+int	 o_flag;	/*    -o: specify output file */
+int	 o_directory;	/*        output file is a directory */
+char	*o_filename;	/*        name of output file */
+int	 o_stdout;	/*        output file is stdout */
+int	 once_flag;	/*    -1: stop at first successful file */
+int	 p_flag = 1;	/* -[Pp]: use passive FTP */
+int	 R_flag;	/*    -R: don't delete partially transferred files */
+int	 r_flag;	/*    -r: restart previously interrupted transfer */
+u_int	 T_secs = 0;	/*    -T: transfer timeout in seconds */
+int	 s_flag;        /*    -s: show size, don't fetch */
+off_t	 S_size;        /*    -S: require size to match */
+int	 t_flag;	/*!   -t: workaround TCP bug */
+int	 v_level = 1;	/*    -v: verbosity level */
+int	 v_tty;		/*        stdout is a tty */
+u_int	 w_secs;	/*    -w: retry delay */
+int	 family = PF_UNSPEC;	/* -[46]: address family to use */
+
+
+u_int	 ftp_timeout;	/* default timeout for FTP transfers */
+u_int	 http_timeout;	/* default timeout for HTTP transfers */
+u_char	*buf;		/* transfer buffer */
+
+
+void
+sig_handler(int sig)
+{
+    errx(1, "Transfer timed out");
+}
+
+struct xferstat {
+    char		 name[40];
+    struct timeval	 start;
+    struct timeval	 end;
+    struct timeval	 last;
+    off_t		 size;
+    off_t		 offset;
+    off_t		 rcvd;
+};
+
+void
+stat_start(struct xferstat *xs, char *name, off_t size, off_t offset)
+{
+    snprintf(xs->name, sizeof xs->name, "%s", name);
+    xs->size = size;
+    xs->offset = offset;
+    if (v_level) {
+	fprintf(stderr, "Receiving %s", xs->name);
+	if (xs->size != -1)
+	    fprintf(stderr, " (%lld bytes)", xs->size - xs->offset);
+    }
+    gettimeofday(&xs->start, NULL);
+    xs->last = xs->start;
+}
+
+void
+stat_update(struct xferstat *xs, off_t rcvd)
+{
+    struct timeval now;
+    
+    xs->rcvd = rcvd;
+
+    if (v_level <= 1 || !v_tty)
+	return;
+    
+    gettimeofday(&now, NULL);
+    if (now.tv_sec <= xs->last.tv_sec)
+	return;
+    xs->last = now;
+    
+    fprintf(stderr, "\rReceiving %s", xs->name);
+    if (xs->size == -1)
+	fprintf(stderr, ": %lld bytes", xs->rcvd - xs->offset);
+    else
+	fprintf(stderr, " (%lld bytes): %d%%", xs->size - xs->offset,
+		(int)((100.0 * xs->rcvd) / (xs->size - xs->offset)));
+}
+
+void
+stat_end(struct xferstat *xs)
+{
+    double delta;
+    double bps;
+    
+    gettimeofday(&xs->end, NULL);
+    
+    if (!v_level)
+	return;
+    
+    fputc('\n', stderr);
+    delta = (xs->end.tv_sec + (xs->end.tv_usec / 1.e6))
+	- (xs->start.tv_sec + (xs->start.tv_usec / 1.e6));
+    fprintf(stderr, "%lld bytes transferred in %.1f seconds ",
+	    xs->size - xs->offset, delta);
+    bps = (xs->size - xs->offset) / delta;
+    if (bps > 1024*1024)
+	fprintf(stderr, "(%.2f MBps)\n", bps / (1024*1024));
+    else if (bps > 1024)
+	fprintf(stderr, "(%.2f kBps)\n", bps / 1024);
+    else
+	fprintf(stderr, "(%.2f Bps)\n", bps);
+}
+
+int
+fetch(char *URL, char *path)
+{
+    struct url *url;
+    struct url_stat us;
+    struct stat sb;
+    struct xferstat xs;
+    FILE *f, *of;
+    size_t size;
+    off_t count;
+    char flags[8];
+    int ch, n, r;
+    u_int timeout;
+
+    f = of = NULL;
+
+    /* parse URL */
+    if ((url = fetchParseURL(URL)) == NULL) {
+	warnx("%s: parse error", URL);
+	goto failure;
+    }
+
+    timeout = 0;
+    *flags = 0;
+
+    /* common flags */
+    if (v_level > 2)
+	strcat(flags, "v");
+    switch (family) {
+    case PF_INET:
+	strcat(flags, "4");
+	break;
+    case PF_INET6:
+	strcat(flags, "6");
+	break;
+    }
+
+    /* FTP specific flags */
+    if (strcmp(url->scheme, "ftp") == 0) {
+	if (p_flag)
+	    strcat(flags, "p");
+	if (d_flag)
+	    strcat(flags, "d");
+	if (H_flag)
+	    strcat(flags, "h");
+	timeout = T_secs ? T_secs : ftp_timeout;
+    }
+    
+    /* HTTP specific flags */
+    if (strcmp(url->scheme, "http") == 0) {
+	if (d_flag)
+	    strcat(flags, "d");
+	if (A_flag)
+	    strcat(flags, "A");
+	timeout = T_secs ? T_secs : http_timeout;
+    }
+
+    /*
+     * Set the protocol timeout.
+     * This currently only works for FTP, so we still use
+     * alarm(timeout) further down.
+     */
+    fetchTimeout = timeout;
+
+    /* stat remote file */
+    alarm(timeout);
+    if (fetchStat(url, &us, flags) == -1)
+	warnx("%s: size not known", path);
+    alarm(timeout);
+
+    /* just print size */
+    if (s_flag) {
+	if (us.size == -1)
+	    printf("Unknown\n");
+	else
+	    printf("%lld\n", us.size);
+	goto success;
+    }
+
+    /* check that size is as expected */
+    if (S_size && us.size != -1 && us.size != S_size) {
+	warnx("%s: size mismatch: expected %lld, actual %lld",
+	      path, S_size, us.size);
+	goto failure;
+    }
+    
+    /* symlink instead of copy */
+    if (l_flag && strcmp(url->scheme, "file") == 0 && !o_stdout) {
+	if (symlink(url->doc, path) == -1) {
+	    warn("%s: symlink()", path);
+	    goto failure;
+	}
+	goto success;
+    }
+
+    if (o_stdout) {
+	/* output to stdout */
+	of = stdout;
+    } else if (r_flag && us.size != -1 && stat(path, &sb) != -1
+	       && (F_flag || (us.mtime && sb.st_mtime == us.mtime))) {
+	/* output to file, restart aborted transfer */
+	if (us.size == sb.st_size)
+	    goto success;
+	else if (sb.st_size > us.size && truncate(path, us.size) == -1) {
+	    warn("%s: truncate()", path);
+	    goto failure;
+	}
+	if ((of = fopen(path, "a")) == NULL) {
+	    warn("%s: open()", path);
+	    goto failure;
+	}
+	url->offset = sb.st_size;
+    } else if (m_flag && us.size != -1 && stat(path, &sb) != -1) {
+	/* output to file, mirror mode */
+	warnx(" local: %lld bytes, mtime %ld", sb.st_size, sb.st_mtime);
+	warnx("remote: %lld bytes, mtime %ld", us.size, us.mtime);
+	if (sb.st_size == us.size && sb.st_mtime == us.mtime)
+	    return 0;
+	if ((of = fopen(path, "w")) == NULL) {
+	    warn("%s: open()", path);
+	    goto failure;
+	}
+    } else {
+	/* output to file, all other cases */
+	if ((of = fopen(path, "w")) == NULL) {
+	    warn("%s: open()", path);
+	    goto failure;
+	}
+    }
+    count = url->offset;
+
+    /* start the transfer */
+    if ((f = fetchGet(url, flags)) == NULL) {
+	warnx("%s", fetchLastErrString);
+	goto failure;
+    }
+    
+    /* start the counter */
+    stat_start(&xs, path, us.size, count);
+
+    n = 0;
+
+    if (us.size == -1) {
+	/*	  
+	 * We have no idea how much data to expect, so do it byte by
+         * byte. This is incredibly inefficient, but there's not much
+         * we can do about it... :(	 
+	 */
+	while (1) {
+	    if (timeout)
+		alarm(timeout);
+#ifdef STDIO_HACK
+	    /*	      
+	     * This is a non-portable hack, but it makes things go
+	     * faster. Basically, if there is data in the input file's
+	     * buffer, write it out; then fall through to the fgetc()
+	     * which forces a refill. It saves a memcpy() and reduces
+	     * the number of iterations, i.e the number of calls to
+	     * alarm(). Empirical evidence shows this can cut user
+	     * time by up to 90%. There may be better (even portable)
+	     * ways to do this.
+	     */
+	    if (f->_r && (f->_ub._base == NULL)) {
+		if (fwrite(f->_p, f->_r, 1, of) < 1)
+		    break;
+		count += f->_r;
+		f->_p += f->_r;
+		f->_r = 0;
+	    }
+#endif
+	    if ((ch = fgetc(f)) == EOF || fputc(ch, of) == EOF)
+		break;
+	    stat_update(&xs, count++);
+	    n++;
+	}
+    } else {
+	/* we know exactly how much to transfer, so do it efficiently */
+	for (size = B_size; count != us.size; n++) {
+	    if (us.size - count < B_size)
+		size = us.size - count;
+	    if (timeout)
+		alarm(timeout);
+	    if (fread(buf, size, 1, f) != 1 || fwrite(buf, size, 1, of) != 1)
+		break;
+	    stat_update(&xs, count += size);
+	}
+    }
+    
+    if (timeout)
+	alarm(0);
+
+    stat_end(&xs);
+    
+    /* check the status of our files */
+    if (ferror(f))
+	warn("%s", URL);
+    if (ferror(of))
+	warn("%s", path);
+    if (ferror(f) || ferror(of)) {
+	if (!R_flag && !o_stdout)
+	    unlink(path);
+	goto failure;
+    }
+
+    /* need to close the file before setting mtime */
+    if (of != stdout) {
+	fclose(of);
+	of = NULL;
+    }
+    
+    /* Set mtime of local file */
+    if (m_flag && us.size != -1 && !o_stdout) {
+	struct timeval tv[2];
+	
+	tv[0].tv_sec = (long)us.atime;
+	tv[1].tv_sec = (long)us.mtime;
+	tv[0].tv_usec = tv[1].tv_usec = 0;
+	if (utimes(path, tv))
+	    warn("%s: utimes()", path);
+    }
+    
+ success:
+    r = 0;
+    goto done;
+ failure:
+    r = -1;
+    goto done;
+ done:
+    if (f)
+	fclose(f);
+    if (of && of != stdout)
+	fclose(of);
+    fetchFreeURL(url);
+    return r;
+}
+
+void
+usage(void)
+{
+    /* XXX badly out of synch */
+    fprintf(stderr,
+	    "Usage: fetch [-1AFHMPRabdlmnpqrstv] [-o outputfile] [-S bytes]\n"
+	    "             [-B bytes] [-T seconds] [-w seconds]\n"
+	    "             [-f file -h host [-c dir] | URL ...]\n"
+	);
+}
+
+
+#define PARSENUM(NAME, TYPE)		\
+int					\
+NAME(char *s, TYPE *v)			\
+{					\
+    *v = 0;				\
+    for (*v = 0; *s; s++)		\
+	if (isdigit(*s))		\
+	    *v = *v * 10 + *s - '0';	\
+	else				\
+	    return -1;			\
+    return 0;				\
+}
+
+PARSENUM(parseint, u_int)
+PARSENUM(parsesize, size_t)
+PARSENUM(parseoff, off_t)
+
+int
+main(int argc, char *argv[])
+{
+    struct stat sb;
+    char *p, *q, *s;
+    int c, e, r;
+
+    while ((c = getopt(argc, argv,
+		       "146AaB:bdFf:h:lHMmnPpo:qRrS:sT:tvw:")) != EOF)
+	switch (c) {
+	case '1':
+	    once_flag = 1;
+	    break;
+	case '4':
+	    family = PF_INET;
+	    break;
+	case '6':
+	    family = PF_INET6;
+	    break;
+	case 'A':
+	    A_flag = 1;
+	    break;
+	case 'a':
+	    a_flag = 1;
+	    break;
+	case 'B':
+	    if (parsesize(optarg, &B_size) == -1)
+		errx(1, "invalid buffer size");
+	    break;
+	case 'b':
+	    warnx("warning: the -b option is deprecated");
+	    b_flag = 1;
+	    break;
+	case 'd':
+	    d_flag = 1;
+	    break;
+	case 'F':
+	    F_flag = 1;
+	    break;
+	case 'f':
+	    f_filename = optarg;
+	    break;
+	case 'H':
+	    H_flag = 1;
+	    break;
+	case 'h':
+	    h_hostname = optarg;
+	    break;
+	case 'l':
+	    l_flag = 1;
+	    break;
+	case 'o':
+	    o_flag = 1;
+	    o_filename = optarg;
+	    break;
+	case 'M':
+	case 'm':
+	    m_flag = 1;
+	    break;
+	case 'n':
+	    m_flag = 0;
+	    break;
+	case 'P':
+	case 'p':
+	    p_flag = 1;
+	    break;
+	case 'q':
+	    v_level = 0;
+	    break;
+	case 'R':
+	    R_flag = 1;
+	    break;
+	case 'r':
+	    r_flag = 1;
+	    break;
+	case 'S':
+	    if (parseoff(optarg, &S_size) == -1)
+		errx(1, "invalid size");
+	    break;
+	case 's':
+	    s_flag = 1;
+	    break;
+	case 'T':
+	    if (parseint(optarg, &T_secs) == -1)
+		errx(1, "invalid timeout");
+	    break;
+	case 't':
+	    t_flag = 1;
+	    warnx("warning: the -t option is deprecated");
+	    break;
+	case 'v':
+	    v_level++;
+	    break;
+	case 'w':
+	    a_flag = 1;
+	    if (parseint(optarg, &w_secs) == -1)
+		errx(1, "invalid delay");
+	    break;
+	default:
+	    usage();
+	    exit(EX_USAGE);
+	}
+
+    argc -= optind;
+    argv += optind;
+
+    if (h_hostname || f_filename) {
+	if (!h_hostname || !f_filename || argc) {
+	    usage();
+	    exit(EX_USAGE);
+	}
+	/* XXX this is a hack. */
+	if (strcspn(h_hostname, "@:/") != strlen(h_hostname))
+	    errx(1, "invalid hostname");
+	if (asprintf(argv, "ftp://%s/%s", h_hostname, f_filename) == -1)
+	    errx(1, strerror(ENOMEM));
+	argc++;
+    }
+    
+    if (!argc) {
+	usage();
+	exit(EX_USAGE);
+    }
+
+    /* allocate buffer */
+    if (B_size < MINBUFSIZE)
+	B_size = MINBUFSIZE;
+    if ((buf = malloc(B_size)) == NULL)
+	errx(1, strerror(ENOMEM));
+
+    /* timeout handling */
+    signal(SIGALRM, sig_handler);
+    if ((s = getenv("FTP_TIMEOUT")) != NULL) {
+	if (parseint(s, &ftp_timeout) == -1) {
+	    warnx("FTP_TIMEOUT is not a positive integer");
+	    ftp_timeout = 0;
+	}
+    }
+    if ((s = getenv("HTTP_TIMEOUT")) != NULL) {
+	if (parseint(s, &http_timeout) == -1) {
+	    warnx("HTTP_TIMEOUT is not a positive integer");
+	    http_timeout = 0;
+	}
+    }
+
+    /* output file */
+    if (o_flag) {
+	if (strcmp(o_filename, "-") == 0) {
+	    o_stdout = 1;
+	} else if (stat(o_filename, &sb) == -1) {
+	    if (errno == ENOENT) {
+		if (argc > 1)
+		    errx(EX_USAGE, "%s is not a directory", o_filename);
+	    } else {
+		err(EX_IOERR, "%s", o_filename);
+	    }
+	} else {
+	    if (sb.st_mode & S_IFDIR)
+		o_directory = 1;
+	}
+    }
+
+    /* check if output is to a tty (for progress report) */
+    v_tty = isatty(STDOUT_FILENO);
+    r = 0;
+
+    while (argc) {
+	if ((p = strrchr(*argv, '/')) == NULL)
+	    p = *argv;
+	else
+	    p++;
+
+	if (!*p)
+	    p = "fetch.out";
+	
+	fetchLastErrCode = 0;
+	
+	if (o_flag) {
+	    if (o_stdout) {
+		e = fetch(*argv, "-");
+	    } else if (o_directory) {
+		asprintf(&q, "%s/%s", o_filename, p);
+		e = fetch(*argv, q);
+		free(q);
+	    } else {
+		e = fetch(*argv, o_filename);
+	    }
+	} else {
+	    e = fetch(*argv, p);
+	}
+
+	if (e == 0 && once_flag)
+	    exit(0);
+	
+	if (e) {
+	    r = 1;
+	    if ((fetchLastErrCode
+		 && fetchLastErrCode != FETCH_UNAVAIL
+		 && fetchLastErrCode != FETCH_MOVED
+		 && fetchLastErrCode != FETCH_URL
+		 && fetchLastErrCode != FETCH_RESOLV
+		 && fetchLastErrCode != FETCH_UNKNOWN)) {
+		if (w_secs) {
+		    if (v_level)
+			fprintf(stderr, "Waiting %d seconds before retrying\n", w_secs);
+		    sleep(w_secs);
+		}
+		if (a_flag)
+		    continue;
+		fprintf(stderr, "Skipping %s\n", *argv);
+	    }
+	}
+
+	argc--, argv++;
+    }
+    
+    exit(r);
+}