fetch.c

EFI（Extensible Firmware Interface)是下一代BIOS

	oldintr = NULL;
	if (setjmp(httpabort)) {
		if (oldintr)
			(void)signal(SIGINT, oldintr);
		goto cleanup_url_get;
	}
	oldintr = signal(SIGINT, aborthttp);

	bytes = 0;
	hashbytes = mark;
	progressmeter(-1);

	/* Finally, suck down the file. */
	i = 0;
	while ((len = read(s, buf, sizeof(buf))) > 0) {
		bytes += len;
		for (cp = buf; len > 0; len -= i, cp += i) {
			if ((i = (int)write(out, cp, len)) == -1) {
				warn("Writing %s", savefile);
				goto cleanup_url_get;
			}
			else if (i == 0)
				break;
		}
		if (hash && !progress) {
			while (bytes >= hashbytes) {
				(void)putchar('#');
				hashbytes += mark;
			}
			(void)fflush(stdout);
		}
	}
	if (hash && !progress && bytes > 0) {
		if (bytes < mark)
			(void)putchar('#');
		(void)putchar('\n');
		(void)fflush(stdout);
	}
	if (len != 0) {
		warn("Reading from socket");
		goto cleanup_url_get;
	}
	progressmeter(1);
	if (verbose)
		puts("Successfully retrieved file.");
	(void)signal(SIGINT, oldintr);

	close(s);
	close(out);
	if (proxy)
		free(proxy);
	free(line);
	return (0);

noftpautologin:
	warnx(
	    "Auto-login using ftp URLs isn't supported when using $ftp_proxy");
	goto cleanup_url_get;

improper:
	warnx("Improper response from %s", host);

cleanup_url_get:
	if (s != -1)
		close(s);
	if (proxy)
		free(proxy);
	free(line);
	return (-1);
}

/*
 * Abort a http retrieval
 */
void
aborthttp(notused)
	int notused;
{

	alarmtimer(0);
	puts("\nhttp fetch aborted.");
	(void)fflush(stdout);
	longjmp(httpabort, 1);
}

/*
 * Retrieve multiple files from the command line, transferring
 * files of the form "host:path", "ftp://host/path" using the
 * ftp protocol, and files of the form "http://host/path" using
 * the http protocol.
 * If path has a trailing "/", then return (-1);
 * the path will be cd-ed into and the connection remains open,
 * and the function will return -1 (to indicate the connection
 * is alive).
 * If an error occurs the return value will be the offset+1 in
 * argv[] of the file that caused a problem (i.e, argv[x]
 * returns x+1)
 * Otherwise, 0 is returned if all files retrieved successfully.
 */
int
auto_fetch(argc, argv)
	int argc;
	char *argv[];
{
	static char lasthost[MAXHOSTNAMELEN];
	char *xargv[5];
	char *cp, *line, *host, *dir, *file, *portnum;
	char *user, *pass;
	char *ftpproxy, *httpproxy;
	int rval, xargc;
	volatile int argpos;
	int dirhasglob, filehasglob;
	char rempath[MAXPATHLEN];

	argpos = 0;

	if (setjmp(toplevel)) {
		if (connected)
			disconnect(0, NULL);
		return (argpos + 1);
	}
	(void)signal(SIGINT, (sig_t)intr);
	(void)signal(SIGPIPE, (sig_t)lostpeer);

	ftpproxy = getenv(FTP_PROXY);
	httpproxy = getenv(HTTP_PROXY);

	/*
	 * Loop through as long as there's files to fetch.
	 */
	for (rval = 0; (rval == 0) && (argpos < argc); free(line), argpos++) {
		if (strchr(argv[argpos], ':') == NULL)
			break;
		host = dir = file = portnum = user = pass = NULL;

		/*
		 * We muck with the string, so we make a copy.
		 */
		line = strdup(argv[argpos]);
		if (line == NULL)
			errx(1, "Can't allocate memory for auto-fetch.");

		/*
		 * Try HTTP URL-style arguments first.
		 */
		if (strncasecmp(line, HTTP_URL, sizeof(HTTP_URL) - 1) == 0) {
			if (url_get(line, httpproxy) == -1)
				rval = argpos + 1;
			continue;
		}

		/*
		 * Try FTP URL-style arguments next. If ftpproxy is
		 * set, use url_get() instead of standard ftp.
		 * Finally, try host:file.
		 */
		host = line;
		if (strncasecmp(line, FTP_URL, sizeof(FTP_URL) - 1) == 0) {
			if (ftpproxy) {
				if (url_get(line, ftpproxy) == -1)
					rval = argpos + 1;
				continue;
			}
			host += sizeof(FTP_URL) - 1;
			dir = strchr(host, '/');

				/* look for [user:pass@]host[:port] */
			pass = strpbrk(host, ":@/");
			if (pass == NULL || *pass == '/') {
				pass = NULL;
				goto parsed_url;
			}
			if (pass == host || *pass == '@') {
bad_ftp_url:
				warnx("Invalid URL: %s", argv[argpos]);
				rval = argpos + 1;
				continue;
			}
			*pass++ = '\0';
			cp = strpbrk(pass, ":@/");
			if (cp == NULL || *cp == '/') {
				portnum = pass;
				pass = NULL;
				goto parsed_url;
			}
			if (EMPTYSTRING(cp) || *cp == ':')
				goto bad_ftp_url;
			*cp++ = '\0';
			user = host;
			if (EMPTYSTRING(user))
				goto bad_ftp_url;
			host = cp;
			portnum = strchr(host, ':');
			if (portnum != NULL)
				*portnum++ = '\0';
		} else {			/* classic style `host:file' */
			dir = strchr(host, ':');
		}
parsed_url:
		if (EMPTYSTRING(host)) {
			rval = argpos + 1;
			continue;
		}

		/*
		 * If dir is NULL, the file wasn't specified
		 * (URL looked something like ftp://host)
		 */
		if (dir != NULL)
			*dir++ = '\0';

		/*
		 * Extract the file and (if present) directory name.
		 */
		if (! EMPTYSTRING(dir)) {
			cp = strrchr(dir, '/');
			if (cp != NULL) {
				*cp++ = '\0';
				file = cp;
			} else {
				file = dir;
				dir = NULL;
			}
		}
		if (debug)
			printf("user %s:%s host %s port %s dir %s file %s\n",
			    user, pass, host, portnum, dir, file);

		/*
		 * Set up the connection if we don't have one.
		 */
		if (strcmp(host, lasthost) != 0) {
			int oautologin;

			(void)strcpy(lasthost, host);
			if (connected)
				disconnect(0, NULL);
			xargv[0] = __progname;
			xargv[1] = host;
			xargv[2] = NULL;
			xargc = 2;
			if (! EMPTYSTRING(portnum)) {
				xargv[2] = portnum;
				xargv[3] = NULL;
				xargc = 3;
			}
			oautologin = autologin;
			if (user != NULL)
				autologin = 0;
			setpeer(xargc, xargv);
			autologin = oautologin;
			if ((connected == 0)
			 || ((connected == 1) && !login(host, user, pass)) ) {
				warnx("Can't connect or login to host `%s'",
				    host);
				rval = argpos + 1;
				continue;
			}

			/* Always use binary transfers. */
			setbinary(0, NULL);
		}
			/* cd back to '/' */
		xargv[0] = "cd";
		xargv[1] = "/";
		xargv[2] = NULL;
		cd(2, xargv);
		if (! dirchange) {
			rval = argpos + 1;
			continue;
		}

		dirhasglob = filehasglob = 0;
		if (doglob) {
			if (! EMPTYSTRING(dir) &&
			    strpbrk(dir, "*?[]{}") != NULL)
				dirhasglob = 1;
			if (! EMPTYSTRING(file) &&
			    strpbrk(file, "*?[]{}") != NULL)
				filehasglob = 1;
		}

		/* Change directories, if necessary. */
		if (! EMPTYSTRING(dir) && !dirhasglob) {
			xargv[0] = "cd";
			xargv[1] = dir;
			xargv[2] = NULL;
			cd(2, xargv);
			if (! dirchange) {
				rval = argpos + 1;
				continue;
			}
		}

		if (EMPTYSTRING(file)) {
			rval = -1;
			continue;
		}

		if (!verbose)
			printf("Retrieving %s/%s\n", dir ? dir : "", file);

		if (dirhasglob) {
			snprintf(rempath, sizeof(rempath), "%s/%s", dir, file);
			file = rempath;
		}

		/* Fetch the file(s). */
		xargv[0] = "get";
		xargv[1] = file;
		xargv[2] = NULL;
		if (dirhasglob || filehasglob) {
			int ointeractive;

			ointeractive = interactive;
			interactive = 0;
			xargv[0] = "mget";
			mget(2, xargv);
			interactive = ointeractive;
		} else
			get(2, xargv);

		if ((code / 100) != COMPLETE)
			rval = argpos + 1;
	}
	if (connected && rval != -1)
		disconnect(0, NULL);
	return (rval);
}