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gopher-validator rewrite in C - gopher-validator - Gopher validator and happy h…
git clone git://git.codemadness.org/gopher-validator
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---
commit 5ca656215b1e77b7fef4dcf37cd6e429146b9426
parent 668e42abfef42e56f315c54ad8aea639f02871ca
Author: Hiltjo Posthuma <[email protected]>
Date: Mon, 22 Jul 2019 18:54:33 +0200
gopher-validator rewrite in C
gopher-validator is now a client of it's own and validates more things
according to the official RFC spec. It does not depend on sacc anymore.
Diffstat:
M LICENSE | 685 +----------------------------…
M Makefile | 84 ++++++++++++++++++-----------…
A README | 13 +++++++++++++
A TODO | 1 +
D gopher-validator | 10 ----------
M gopher-validator.1 | 88 ++++++++++++++++++++---------…
A gopher-validator.c | 529 +++++++++++++++++++++++++++++…
7 files changed, 661 insertions(+), 749 deletions(-)
---
diff --git a/LICENSE b/LICENSE
@@ -1,676 +1,15 @@
-© 2018 Christoph Lohmann <20h at r-36 dot net>
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-OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
-THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
-PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
-IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
-ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
-
- 16. Limitation of Liability.
-
- IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
-WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
-THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
-GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
-USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
-DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
-PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
-EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
-SUCH DAMAGES.
-
- 17. Interpretation of Sections 15 and 16.
-
- If the disclaimer of warranty and limitation of liability provided
-above cannot be given local legal effect according to their terms,
-reviewing courts shall apply local law that most closely approximates
-an absolute waiver of all civil liability in connection with the
-Program, unless a warranty or assumption of liability accompanies a
-copy of the Program in return for a fee.
-
- END OF TERMS AND CONDITIONS
-
- How to Apply These Terms to Your New Programs
-
- If you develop a new program, and you want it to be of the greatest
-possible use to the public, the best way to achieve this is to make it
-free software which everyone can redistribute and change under these terms.
-
- To do so, attach the following notices to the program. It is safest
-to attach them to the start of each source file to most effectively
-state the exclusion of warranty; and each file should have at least
-the "copyright" line and a pointer to where the full notice is found.
-
- <one line to give the program's name and a brief idea of what it does.>
- Copyright (C) <year> <name of author>
-
- This program is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 3 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-Also add information on how to contact you by electronic and paper mail.
-
- If the program does terminal interaction, make it output a short
-notice like this when it starts in an interactive mode:
-
- <program> Copyright (C) <year> <name of author>
- This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
- This is free software, and you are welcome to redistribute it
- under certain conditions; type `show c' for details.
-
-The hypothetical commands `show w' and `show c' should show the appropriate
-parts of the General Public License. Of course, your program's commands
-might be different; for a GUI interface, you would use an "about box".
-
- You should also get your employer (if you work as a programmer) or school,
-if any, to sign a "copyright disclaimer" for the program, if necessary.
-For more information on this, and how to apply and follow the GNU GPL, see
-<http://www.gnu.org/licenses/>.
-
- The GNU General Public License does not permit incorporating your program
-into proprietary programs. If your program is a subroutine library, you
-may consider it more useful to permit linking proprietary applications with
-the library. If this is what you want to do, use the GNU Lesser General
-Public License instead of this License. But first, please read
-<http://www.gnu.org/philosophy/why-not-lgpl.html>.
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
diff --git a/Makefile b/Makefile
@@ -1,47 +1,59 @@
-# gopher-validator - a tiny gopher validator
-# See LICENSE file for copyright and license details.
.POSIX:
+# paths
+PREFIX = /usr/local
+MANPREFIX = ${PREFIX}/man
+
+# compiler and linker
+CC = cc
+
NAME = gopher-validator
VERSION = 0.1
+BIN = ${NAME}
+SRC = ${BIN:=.c}
+OBJ = ${BIN:=.o}
+MAN1 = ${BIN:=.1}
+DOC = LICENSE README
-PREFIX = /usr/local
-BINDIR = ${PREFIX}/bin
-MANDIR = ${PREFIX}/share/man/man1
+# build static: useful in a chroot.
+#LDFLAGS += -static
+# Linux
+#CPPFLAGS += -D_DEFAULT_SOURCE
+
+all: ${BIN}
-all: info ${NAME}
+${BIN}: ${OBJ}
+ ${CC} -o $@ ${OBJ} ${LDFLAGS}
-info:
- @echo Just run make install.
+${OBJ}: Makefile
clean:
- @echo cleaning
- @rm -f ${NAME}-${VERSION}.tar.gz
-
-install: all
- @echo installing script to ${DESTDIR}${BINDIR}
- @mkdir -p "${DESTDIR}${BINDIR}"
- @cp -f ${NAME} "${DESTDIR}${BINDIR}"
- @chmod 755 "${DESTDIR}${BINDIR}/${NAME}"
- @echo installing manpage to "${DESTDIR}${MANDIR}"
- @mkdir -p "${DESTDIR}${MANDIR}"
- @cp -f ${NAME}.1 "${DESTDIR}${MANDIR}"
- @chmod 644 "${DESTDIR}${MANDIR}/${NAME}.1"
+ rm -f ${BIN} ${OBJ}
+
+install:
+ # installing executable files and scripts.
+ mkdir -p "${DESTDIR}${PREFIX}/bin"
+ cp -f ${BIN} "${DESTDIR}${PREFIX}/bin"
+ for f in ${BIN}; do chmod 755 "${DESTDIR}${PREFIX}/bin/$$f"; done
+ # installing manual pages for general commands: section 1.
+ mkdir -p "${DESTDIR}${MANPREFIX}/man1"
+ cp -f ${MAN1} "${DESTDIR}${MANPREFIX}/man1"
+ for m in ${MAN1}; do chmod 644 "${DESTDIR}${MANPREFIX}/man1/$$m"; done
uninstall:
- @echo removing executable file from ${DESTDIR}${BINDIR}
- @rm -f "${DESTDIR}${BINDIR}/${NAME}"
- @echo removing manpage from "${DESTDIR}${MANDIR}"
- @rm -f "${DESTDIR}${MANDIR}/${NAME}.8"
-
-dist: clean
- @echo creating dist tarball
- @mkdir -p ${NAME}-${VERSION}
- @cp -R README LICENSE Makefile ${NAME}.1 \
- ${NAME}-${VERSION}
- @tar -cf ${NAME}-${VERSION}.tar ${NAME}-${VERSION}
- @gzip ${NAME}-${VERSION}.tar
- @mv ${NAME}-${VERSION}.tar.gz ${NAME}-${VERSION}.tgz
- @rm -rf "${NAME}-${VERSION}"
-
-.PHONY: all info clean dist install uninstall
+ # removing executable files and scripts.
+ for f in ${BIN}; do rm -f "${DESTDIR}${PREFIX}/bin/$$f"; done
+ # removing manual pages.
+ for m in ${MAN1}; do rm -f "${DESTDIR}${MANPREFIX}/man1/$$m"; done
+
+dist:
+ rm -rf "${NAME}-${VERSION}"
+ mkdir -p "${NAME}-${VERSION}"
+ cp -f ${DOC} ${MAN1} ${SRC} Makefile "${NAME}-${VERSION}"
+ # make tarball
+ tar -cf - "${NAME}-${VERSION}" | \
+ gzip -c > "${NAME}-${VERSION}.tar.gz"
+ rm -rf "${NAME}-${VERSION}"
+
+
+.PHONY: all clean dist install uninstall
diff --git a/README b/README
@@ -0,0 +1,13 @@
+gopher-validator
+----------------
+
+Validate Gopher directory and search types.
+
+
+Dependencies
+------------
+
+- C compiler.
+- libc + some BSD extensions (dprintf).
+- POSIX system.
+- make (optional).
diff --git a/TODO b/TODO
@@ -0,0 +1 @@
+- allow CGI-mode for HTTP (add header), keep compatible with Gopher CGI.
diff --git a/gopher-validator b/gopher-validator
@@ -1,10 +0,0 @@
-#!/bin/sh
-#
-# See the LICENSE for licensing details.
-#
-
-result="$(sacc "$@" | grep "^!")" || printf "valid\n" && exit 0
-
-printf "Errors found\n%s\n" "${result}"
-exit 1
-
diff --git a/gopher-validator.1 b/gopher-validator.1
@@ -1,43 +1,71 @@
-.Dd August 10, 2018
-.Dt GEOMYIDAE 1
+.Dd July 22, 2019
+.Dt GOPHER-VALIDATOR 1
.Os
-.
.Sh NAME
.Nm gopher-validator
.Nd a simple gopher validator
-.
.Sh SYNOPSIS
.Nm
-URL
-.
+.Op Ar url
.Sh DESCRIPTION
-.Bd -filled
.Nm
-is a simple script to validate gopher content served on some URI/selector in a
-gopher menu. The menu structure is defined in the RFC 1436 (Gopher).
+reads raw Gopher data from stdin.
+.Pp
+When an
+.Ar url
+is specified it retrieves the raw Gopher data from this url.
+.Pp
+When the environment variable
+.Ev QUERY_STRING
+is set the program runs in Command Gateway Interface (CGI) mode.
+It will use the content of this variable as if it was
+.Ar url .
+.Pp
.Nm
-is using sacc(1) as the gopher protocol implementation.
+validates Gopher data of directory (1) and search types (7).
+.Sh DIAGNOSTICS
+The following output format is used for the fatal, error and warning messages.
+These are prefixed with the following texts:
+.Bl -tag -width Ds
+.It Qq "fatal: "
+.Pp
+Fatal program errors such as connection errors.
+These messages are written to stderr, unless
+.Nm
+runs in CGI mode.
+.It Qq "error: "
+.Pp
+Gopher errors violating the RFC specification.
+These messages are written to stdout.
+.It Qq "warning: "
+.Pp
+Recommendations according to the RFC specification.
+These messages are written to stdout.
+.El
+.Pp
+If possible the messages are also prefixed with the output line number.
+.Sh EXIT STATUS
+When there is a fatal error the exitcode is 2.
+When there is any Gopher error the exitcode is 1.
+When there is no error (could still have a warning) the exitcode is 0.
+.Sh EXAMPLES
+.Bd -literal
+printf '\\r\\n' | nc codemadness.org 70 | gopher-validator
+.Ed
+.Bd -literal
+gopher-validator gopher://codemadness.org/1
.Ed
-.
-.Sh RETURN VALUES
-.Bd -filled
+.Sh SEE ALSO
+.Xr nc 1
+.Sh STANDARDS
+RFC1436 is followed as closely as possible.
+The only deviation is checking for UTF-8 instead of LATIN-1 text encoding,
+for now.
.Nm
-will return an exit status of 1 in case anything went wrong. It will write on
-stdout the error and lines found to be erroneous. If everything went right,
+uses the standard C library locale functions and respects the user locale
+environment.
+To check text encoding it is assumed
.Nm
-will return the string "valid" and an exit status of 0.
-.
-.Sh SEE ALSO
-sacc (1)
-.
+runs in the same locale environment as the server.
.Sh AUTHORS
-See LICENSE file for authors in the distribution.
-.
-.Sh LICENSE
-See LICENSE file for the license.
-.
-.Sh BUGS
-.Ss "Reporting Bugs"
-Report bugs to:
-.An "Christoph Lohmann" Aq [email protected]
-
+.An Hiltjo Posthuma Aq Mt [email protected]
diff --git a/gopher-validator.c b/gopher-validator.c
@@ -0,0 +1,529 @@
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <sys/types.h>
+
+#include <ctype.h>
+#include <errno.h>
+#include <locale.h>
+#include <limits.h>
+#include <netdb.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <wchar.h>
+#include <wctype.h>
+
+#define MAX_RESPONSETIMEOUT 10 /* timeout in seconds */
+
+#ifndef __OpenBSD__
+#define pledge(a,b) 0
+#endif
+
+struct uri {
+ char host[256];
+ char port[8];
+ char path[1024];
+};
+
+struct visited {
+ int _type;
+ char username[1024];
+ char path[1024];
+ char server[256];
+ char port[8];
+};
+
+/* check valid types with extension in path */
+struct {
+ const char *ext;
+ const char *allow;
+} types [] = {
+ { .ext = "md5", "0" },
+ { .ext = "md5sum", "0" },
+ { .ext = "sha1", "0" },
+ { .ext = "sha1sum", "0" },
+ { .ext = "sha256", "0" },
+ { .ext = "sha256sum", "0" },
+ { .ext = "sha512", "0" },
+ { .ext = "sha512sum", "0" },
+ { .ext = "asc", "0" },
+ { .ext = "rss", "0" },
+ { .ext = "xml", "0" },
+ { .ext = "txt", "0" },
+ { .ext = "json", "0" },
+ { .ext = "md", "0" },
+ { .ext = "c", "0" },
+ { .ext = "h", "0" },
+ { .ext = "sh", "0" },
+ { .ext = "go", "0" },
+ { .ext = "srt", "0" },
+ { .ext = "m3u", "0" },
+ { .ext = "htm", "0h" },
+ { .ext = "html", "0h" },
+ { .ext = "gph", "1" },
+ { .ext = "dcgi", "17" },
+ { .ext = "gif", "gI" },
+ { .ext = "jpg", "I" },
+ { .ext = "jpeg", "I" },
+ { .ext = "png", "I" },
+ { .ext = "doc", "9" },
+ { .ext = "pdf", "9" },
+ { .ext = "iso", "9" },
+ { .ext = "exe", "9" },
+ { .ext = "gz", "9" },
+ { .ext = "tgz", "9" },
+ { .ext = "bz2", "9" },
+ { .ext = "xz", "9" },
+ { .ext = "lzma", "9" },
+ { .ext = "wav", "9" },
+ { .ext = "mp3", "9" },
+ { .ext = "ogg", "9" },
+ { .ext = "avi", "9" },
+ { .ext = "mp4", "9" },
+ { .ext = "mkv", "9" },
+ { .ext = "ogv", "9" },
+};
+
+int exitcode = 0;
+FILE *errfp, *outfp;
+
+void
+die(const char *fmt, ...)
+{
+ va_list ap;
+
+ fputs("fatal: ", errfp);
+
+ va_start(ap, fmt);
+ vfprintf(errfp, fmt, ap);
+ va_end(ap);
+
+ exit(2);
+}
+
+void
+error(const char *fmt, ...)
+{
+ va_list ap;
+
+ fputs("error: ", outfp);
+
+ va_start(ap, fmt);
+ vfprintf(outfp, fmt, ap);
+ va_end(ap);
+
+ exitcode = 1;
+}
+
+void
+warning(const char *fmt, ...)
+{
+ va_list ap;
+
+ fputs("warning: ", outfp);
+
+ va_start(ap, fmt);
+ vfprintf(outfp, fmt, ap);
+ va_end(ap);
+}
+
+int
+edial(const char *host, const char *port)
+{
+ struct addrinfo hints, *res, *res0;
+ int error, save_errno, s;
+ const char *cause = NULL;
+ struct timeval timeout;
+
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_family = AF_UNSPEC;
+ hints.ai_socktype = SOCK_STREAM;
+ hints.ai_flags = AI_NUMERICSERV; /* numeric port only */
+ if ((error = getaddrinfo(host, port, &hints, &res0)))
+ die("%s: %s: %s:%s\n", __func__, gai_strerror(error), host, po…
+ s = -1;
+ for (res = res0; res; res = res->ai_next) {
+ s = socket(res->ai_family, res->ai_socktype,
+ res->ai_protocol);
+ if (s == -1) {
+ cause = "socket";
+ continue;
+ }
+
+ timeout.tv_sec = MAX_RESPONSETIMEOUT;
+ timeout.tv_usec = 0;
+ if (setsockopt(s, SOL_SOCKET, SO_SNDTIMEO, &timeout, sizeof(ti…
+ die("%s: setsockopt: %s\n", __func__, strerror(errno));
+
+ timeout.tv_sec = MAX_RESPONSETIMEOUT;
+ timeout.tv_usec = 0;
+ if (setsockopt(s, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(ti…
+ die("%s: setsockopt: %s\n", __func__, strerror(errno));
+
+ if (connect(s, res->ai_addr, res->ai_addrlen) == -1) {
+ cause = "connect";
+ save_errno = errno;
+ close(s);
+ errno = save_errno;
+ s = -1;
+ continue;
+ }
+ break;
+ }
+ if (s == -1)
+ die("%s: %s: %s:%s\n", __func__, cause, host, port);
+ freeaddrinfo(res0);
+
+ return s;
+}
+
+void
+checkdir(FILE *fp)
+{
+ struct visited v;
+ char line[1024], *end, *s;
+ size_t linenr;
+ ssize_t n;
+ long long l;
+ int i, r, len, hasdotend = 0, c, primarytype = 0, wc, col;
+ wchar_t w;
+
+ if (pledge("stdio", NULL) == -1)
+ die("pledge: %s\n", strerror(errno));
+
+ for (linenr = 1; fgets(line, sizeof(line), fp); linenr++) {
+ n = strcspn(line, "\n");
+ if (line[n] != '\n')
+ die("%zu: line too long\n", linenr); /* fatal */
+ if (n && line[n] == '\n')
+ line[n] = '\0';
+ if (n && line[n - 1] == '\r')
+ line[--n] = '\0';
+ else
+ error("%zu: invalid line-ending, not CRLF (\\r\\n)\n",…
+ if (n == 1 && line[0] == '.') {
+ hasdotend = 1;
+ break;
+ }
+
+ memset(&v, 0, sizeof(v));
+
+ v._type = line[0];
+
+ /* "username" */
+ i = 1;
+ len = strcspn(line + i, "\t");
+ if (len + 1 < sizeof(v.username)) {
+ memcpy(v.username, line + i, len);
+ v.username[len] = '\0';
+ } else {
+ error("%zu: username field too long\n", linenr);
+ continue;
+ }
+ if (line[i + len] == '\t') {
+ i += len + 1;
+ } else {
+ error("%zu: invalid line / field count\n", linenr);
+ continue;
+ }
+
+ /* selector / path */
+ len = strcspn(line + i, "\t");
+ if (len + 1 < sizeof(v.path)) {
+ memcpy(v.path, line + i, len);
+ v.path[len] = '\0';
+ } else {
+ error("%zu: path field too long\n", linenr);
+ continue;
+ }
+ if (line[i + len] == '\t') {
+ i += len + 1;
+ } else {
+ error("%zu: invalid line / field count\n", linenr);
+ continue;
+ }
+
+ /* server */
+ len = strcspn(line + i, "\t");
+ if (len + 1 < sizeof(v.server)) {
+ memcpy(v.server, line + i, len);
+ v.server[len] = '\0';
+ } else {
+ error("%zu: server field too long\n", linenr);
+ continue;
+ }
+ if (line[i + len] == '\t') {
+ i += len + 1;
+ } else {
+ error("%zu: invalid line / field count\n", linenr);
+ continue;
+ }
+
+ /* port */
+ len = strcspn(line + i, "\t");
+ if (len + 1 < sizeof(v.port)) {
+ memcpy(v.port, line + i, len);
+ v.port[len] = '\0';
+ } else {
+ error("%zu: port field too long\n", linenr);
+ continue;
+ }
+
+ /* check non-standard types */
+ c = v._type;
+ if (v._type == '+' && !primarytype)
+ error("%zu: mirror type used, but no previous type set…
+ if (v._type != '+')
+ primarytype = v._type;
+
+ if (!(isdigit(c) || c == 'g' || c == 'I' || c == 'T' || c == '…
+ /* common-used */
+ if (c == 'i' || c == 'h') {
+#if 0
+ warning("%zu: non-standard, but common-used ty…
+ linenr, c);
+#endif
+ } else {
+ /* 3.8: "Characters '0' through 'Z' are reserv…
+ experiments should use other characters.
+ Machine-specific extensions are not encoura…
+ if (c >= '0' && c <= 'Z')
+ error("%zu: unknown / non-standard typ…
+ linenr, c);
+ }
+ }
+
+ /* check type with file extension */
+ if ((s = strrchr(v.path, '.')) && !strchr(s, '/')) {
+ s++;
+ for (i = 0; i < sizeof(types) / sizeof(*types); i++) {
+ if (primarytype == 'h' &&
+ !strncmp(v.path, "URL:", sizeof("URL:") - …
+ continue;
+
+ if (!strcasecmp(s, types[i].ext) &&
+ !strchr(types[i].allow, primarytype)) {
+ warning("%zu: invalid type '%c' for ex…
+ linenr, primarytype, types[i].…
+ break;
+ }
+ }
+ }
+
+ /* check port, must be numeric and in range, port 0 is allowed:
+ "Appendix:
+ Note: Port corresponds the the TCP Port Number, its value shou…
+ be in the range [0..65535]; port 70 is officially assign…
+ to gopher." */
+
+ errno = 0;
+ l = strtoll(v.port, &end, 10);
+ if (errno || *end || l < 0 || l > 65535) {
+ error("%zu: invalid port: %s\n", linenr, v.port);
+ } else {
+#if 0
+ if (l != 70)
+ warning("%zu: non-standard gopher port: %lld, …
+ linenr, l);
+#endif
+ }
+
+ /* RFC "Notes": "The Selector string should be no longer than
+ 255 characters." */
+ if ((len = strlen(v.path)) > 255)
+ error("%zu: selector should not be longer than 255 cha…
+ linenr, len);
+
+ /* decode UTF-8 (text-encoding is ASCII/Latin1 in the RFC, but
+ Latin1 sucks, recommend UTF-8 instead.
+ Check column length as recommended as described in the RFC
+ in section 3.9. */
+ s = v.username;
+ len = strlen(s);
+ col = 0;
+ for (i = 0; i < len; i += r) {
+ r = mbtowc(&w, &s[i], len - i < 4 ? len - i : 4);
+ if (r == 0)
+ break;
+ if (r == -1) {
+ warning("%zu:%d: username: first invalid byte,…
+ linenr, i);
+ break;
+ }
+ if ((wc = wcwidth(w)) == -1)
+ wc = 1;
+ col += (size_t)wc;
+
+ /* RFC "Notes": "It is *highly* recommended that the
+ User_Name field contain only printable characters".…
+ if (!iswprint(w)) {
+ error("%zu:%d: first non-printable character i…
+ linenr, i);
+ break;
+ }
+ }
+#if 0
+ /* instead of 70 check 79 */
+ if (col > 79)
+ warning("%zu: username column length is > 79 (%d), see…
+ linenr, col);
+#endif
+
+ if (!strcmp(v.path, "..") || strstr(v.path, "../"))
+ warning("%zu: found ../ in path: don't use relative pa…
+ }
+ if (ferror(fp))
+ die("fgets: %s\n", strerror(errno));
+
+ if (!hasdotend)
+ error("no .\\r\\n end\n");
+}
+
+void
+checkremote(const char *server, const char *port, const char *path, const char…
+{
+ FILE *fp;
+ int fd, r;
+
+ fd = edial(server, port);
+
+ if (param[0])
+ r = dprintf(fd, "%s\t%s\r\n", path, param);
+ else
+ r = dprintf(fd, "%s\r\n", path);
+ if (r == -1)
+ die("write: %s\n", strerror(errno));
+
+ if (!(fp = fdopen(fd, "rb+")))
+ die("fdopen: %s\n", strerror(errno));
+ checkdir(fp);
+ fclose(fp);
+}
+
+int
+parseuri(const char *str, struct uri *u)
+{
+ const char *s, *e;
+
+ memset(u, 0, sizeof(struct uri));
+
+ s = str;
+
+ /* IPv6 */
+ if (*s == '[') {
+ s++;
+ e = strchr(s, ']');
+ if (!e || e - s + 1 >= sizeof(u->host))
+ return 0;
+ memcpy(u->host, s, e - s);
+ u->host[e - s] = '\0';
+ e++;
+ } else {
+ e = &s[strcspn(s, ":/")];
+ if (e - s + 1 >= sizeof(u->host))
+ return 0;
+ memcpy(u->host, s, e - s);
+ u->host[e - s] = '\0';
+ }
+
+ if (*e == ':') {
+ s = e + 1;
+ e = &s[strcspn(s, "/")];
+
+ if (e - s + 1 >= sizeof(u->port))
+ return 0;
+ memcpy(u->port, s, e - s);
+ u->port[e - s] = '\0';
+ }
+ if (*e && *e != '/')
+ return 0; /* invalid path */
+
+ s = e;
+ e = s + strlen(s);
+
+ if (e - s + 1 >= sizeof(u->path))
+ return 0;
+ memcpy(u->path, s, e - s);
+ u->path[e - s] = '\0';
+
+ return 1;
+}
+
+int
+main(int argc, char **argv)
+{
+ struct uri u;
+ const char *path, *uri = "", *param = "", *s;
+ int _type = '1';
+
+ setlocale(LC_CTYPE, "");
+
+ outfp = stdout;
+ errfp = stderr;
+
+ /* CGI-mode or stand-alone */
+ if ((s = getenv("QUERY_STRING"))) {
+ uri = s;
+ param = "";
+ errfp = stdout; /* output errors to stdout also in CGI mode */
+ } else {
+ switch (argc) {
+ case 3:
+ param = argv[2];
+ case 2:
+ uri = argv[1];
+ break;
+ case 1:
+ checkdir(stdin);
+ return exitcode;
+ default:
+ fprintf(errfp, "usage: %s [uri] [param]\n", argv[0]);
+ return 1;
+ }
+ }
+
+ if (pledge("stdio inet dns", NULL) == -1)
+ die("pledge: %s\n", strerror(errno));
+
+ if (!strncmp(uri, "gopher://", sizeof("gopher://") - 1))
+ uri += sizeof("gopher://") - 1;
+
+ if (!parseuri(uri, &u))
+ die("Invalid uri\n");
+ if (u.host[0] == '\0')
+ die("Invalid hostname\n");
+
+ if (u.path[0] == '\0')
+ memcpy(u.path, "/", 2);
+ if (u.port[0] == '\0')
+ memcpy(u.port, "70", 3);
+
+ path = u.path;
+ if (path[0] == '/') {
+ path++;
+ if (*path) {
+ _type = *path;
+ path++;
+ }
+ } else {
+ path = "";
+ }
+
+ switch (_type) {
+ case '1':
+ case '7':
+ break; /* handled below */
+ default: /* these types are not validated */
+ fprintf(errfp, "only types 1 (dir) and 7 (search) are validate…
+ return 1;
+ }
+
+ if (_type != '7')
+ param = "";
+
+ checkremote(u.host, u.port, path, param);
+
+ return exitcode;
+}
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