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-rw-r--r--usr.bin/mandoc/cgi.c1255
1 files changed, 1255 insertions, 0 deletions
diff --git a/usr.bin/mandoc/cgi.c b/usr.bin/mandoc/cgi.c
new file mode 100644
index 0000000..766ac06
--- /dev/null
+++ b/usr.bin/mandoc/cgi.c
@@ -0,0 +1,1255 @@
+/* $OpenBSD: cgi.c,v 1.110 2020/04/03 11:34:19 schwarze Exp $ */
+/*
+ * Copyright (c) 2014-2019 Ingo Schwarze <schwarze@usta.de>
+ * Copyright (c) 2011, 2012 Kristaps Dzonsons <kristaps@bsd.lv>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS 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.
+ *
+ * Implementation of the man.cgi(8) program.
+ */
+#include <sys/types.h>
+#include <sys/time.h>
+
+#include <ctype.h>
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "mandoc_aux.h"
+#include "mandoc.h"
+#include "roff.h"
+#include "mdoc.h"
+#include "man.h"
+#include "mandoc_parse.h"
+#include "main.h"
+#include "manconf.h"
+#include "mansearch.h"
+#include "cgi.h"
+
+/*
+ * A query as passed to the search function.
+ */
+struct query {
+ char *manpath; /* desired manual directory */
+ char *arch; /* architecture */
+ char *sec; /* manual section */
+ char *query; /* unparsed query expression */
+ int equal; /* match whole names, not substrings */
+};
+
+struct req {
+ struct query q;
+ char **p; /* array of available manpaths */
+ size_t psz; /* number of available manpaths */
+ int isquery; /* QUERY_STRING used, not PATH_INFO */
+};
+
+enum focus {
+ FOCUS_NONE = 0,
+ FOCUS_QUERY
+};
+
+static void html_print(const char *);
+static void html_putchar(char);
+static int http_decode(char *);
+static void http_encode(const char *);
+static void parse_manpath_conf(struct req *);
+static void parse_path_info(struct req *, const char *);
+static void parse_query_string(struct req *, const char *);
+static void pg_error_badrequest(const char *);
+static void pg_error_internal(void);
+static void pg_index(const struct req *);
+static void pg_noresult(const struct req *, int, const char *,
+ const char *);
+static void pg_redirect(const struct req *, const char *);
+static void pg_search(const struct req *);
+static void pg_searchres(const struct req *,
+ struct manpage *, size_t);
+static void pg_show(struct req *, const char *);
+static void resp_begin_html(int, const char *, const char *);
+static void resp_begin_http(int, const char *);
+static void resp_catman(const struct req *, const char *);
+static void resp_copy(const char *);
+static void resp_end_html(void);
+static void resp_format(const struct req *, const char *);
+static void resp_searchform(const struct req *, enum focus);
+static void resp_show(const struct req *, const char *);
+static void set_query_attr(char **, char **);
+static int validate_arch(const char *);
+static int validate_filename(const char *);
+static int validate_manpath(const struct req *, const char *);
+static int validate_urifrag(const char *);
+
+static const char *scriptname = SCRIPT_NAME;
+
+static const int sec_prios[] = {1, 4, 5, 8, 6, 3, 7, 2, 9};
+static const char *const sec_numbers[] = {
+ "0", "1", "2", "3", "3p", "4", "5", "6", "7", "8", "9"
+};
+static const char *const sec_names[] = {
+ "All Sections",
+ "1 - General Commands",
+ "2 - System Calls",
+ "3 - Library Functions",
+ "3p - Perl Library",
+ "4 - Device Drivers",
+ "5 - File Formats",
+ "6 - Games",
+ "7 - Miscellaneous Information",
+ "8 - System Manager\'s Manual",
+ "9 - Kernel Developer\'s Manual"
+};
+static const int sec_MAX = sizeof(sec_names) / sizeof(char *);
+
+static const char *const arch_names[] = {
+ "amd64", "alpha", "armv7", "arm64",
+ "hppa", "i386", "landisk",
+ "loongson", "luna88k", "macppc", "mips64",
+ "octeon", "sgi", "socppc", "sparc64",
+ "amiga", "arc", "armish", "arm32",
+ "atari", "aviion", "beagle", "cats",
+ "hppa64", "hp300",
+ "ia64", "mac68k", "mvme68k", "mvme88k",
+ "mvmeppc", "palm", "pc532", "pegasos",
+ "pmax", "powerpc", "solbourne", "sparc",
+ "sun3", "vax", "wgrisc", "x68k",
+ "zaurus"
+};
+static const int arch_MAX = sizeof(arch_names) / sizeof(char *);
+
+/*
+ * Print a character, escaping HTML along the way.
+ * This will pass non-ASCII straight to output: be warned!
+ */
+static void
+html_putchar(char c)
+{
+
+ switch (c) {
+ case '"':
+ printf("&quot;");
+ break;
+ case '&':
+ printf("&amp;");
+ break;
+ case '>':
+ printf("&gt;");
+ break;
+ case '<':
+ printf("&lt;");
+ break;
+ default:
+ putchar((unsigned char)c);
+ break;
+ }
+}
+
+/*
+ * Call through to html_putchar().
+ * Accepts NULL strings.
+ */
+static void
+html_print(const char *p)
+{
+
+ if (NULL == p)
+ return;
+ while ('\0' != *p)
+ html_putchar(*p++);
+}
+
+/*
+ * Transfer the responsibility for the allocated string *val
+ * to the query structure.
+ */
+static void
+set_query_attr(char **attr, char **val)
+{
+
+ free(*attr);
+ if (**val == '\0') {
+ *attr = NULL;
+ free(*val);
+ } else
+ *attr = *val;
+ *val = NULL;
+}
+
+/*
+ * Parse the QUERY_STRING for key-value pairs
+ * and store the values into the query structure.
+ */
+static void
+parse_query_string(struct req *req, const char *qs)
+{
+ char *key, *val;
+ size_t keysz, valsz;
+
+ req->isquery = 1;
+ req->q.manpath = NULL;
+ req->q.arch = NULL;
+ req->q.sec = NULL;
+ req->q.query = NULL;
+ req->q.equal = 1;
+
+ key = val = NULL;
+ while (*qs != '\0') {
+
+ /* Parse one key. */
+
+ keysz = strcspn(qs, "=;&");
+ key = mandoc_strndup(qs, keysz);
+ qs += keysz;
+ if (*qs != '=')
+ goto next;
+
+ /* Parse one value. */
+
+ valsz = strcspn(++qs, ";&");
+ val = mandoc_strndup(qs, valsz);
+ qs += valsz;
+
+ /* Decode and catch encoding errors. */
+
+ if ( ! (http_decode(key) && http_decode(val)))
+ goto next;
+
+ /* Handle key-value pairs. */
+
+ if ( ! strcmp(key, "query"))
+ set_query_attr(&req->q.query, &val);
+
+ else if ( ! strcmp(key, "apropos"))
+ req->q.equal = !strcmp(val, "0");
+
+ else if ( ! strcmp(key, "manpath")) {
+#ifdef COMPAT_OLDURI
+ if ( ! strncmp(val, "OpenBSD ", 8)) {
+ val[7] = '-';
+ if ('C' == val[8])
+ val[8] = 'c';
+ }
+#endif
+ set_query_attr(&req->q.manpath, &val);
+ }
+
+ else if ( ! (strcmp(key, "sec")
+#ifdef COMPAT_OLDURI
+ && strcmp(key, "sektion")
+#endif
+ )) {
+ if ( ! strcmp(val, "0"))
+ *val = '\0';
+ set_query_attr(&req->q.sec, &val);
+ }
+
+ else if ( ! strcmp(key, "arch")) {
+ if ( ! strcmp(val, "default"))
+ *val = '\0';
+ set_query_attr(&req->q.arch, &val);
+ }
+
+ /*
+ * The key must be freed in any case.
+ * The val may have been handed over to the query
+ * structure, in which case it is now NULL.
+ */
+next:
+ free(key);
+ key = NULL;
+ free(val);
+ val = NULL;
+
+ if (*qs != '\0')
+ qs++;
+ }
+}
+
+/*
+ * HTTP-decode a string. The standard explanation is that this turns
+ * "%4e+foo" into "n foo" in the regular way. This is done in-place
+ * over the allocated string.
+ */
+static int
+http_decode(char *p)
+{
+ char hex[3];
+ char *q;
+ int c;
+
+ hex[2] = '\0';
+
+ q = p;
+ for ( ; '\0' != *p; p++, q++) {
+ if ('%' == *p) {
+ if ('\0' == (hex[0] = *(p + 1)))
+ return 0;
+ if ('\0' == (hex[1] = *(p + 2)))
+ return 0;
+ if (1 != sscanf(hex, "%x", &c))
+ return 0;
+ if ('\0' == c)
+ return 0;
+
+ *q = (char)c;
+ p += 2;
+ } else
+ *q = '+' == *p ? ' ' : *p;
+ }
+
+ *q = '\0';
+ return 1;
+}
+
+static void
+http_encode(const char *p)
+{
+ for (; *p != '\0'; p++) {
+ if (isalnum((unsigned char)*p) == 0 &&
+ strchr("-._~", *p) == NULL)
+ printf("%%%2.2X", (unsigned char)*p);
+ else
+ putchar(*p);
+ }
+}
+
+static void
+resp_begin_http(int code, const char *msg)
+{
+
+ if (200 != code)
+ printf("Status: %d %s\r\n", code, msg);
+
+ printf("Content-Type: text/html; charset=utf-8\r\n"
+ "Cache-Control: no-cache\r\n"
+ "Content-Security-Policy: default-src 'none'; "
+ "style-src 'self' 'unsafe-inline'\r\n"
+ "Pragma: no-cache\r\n"
+ "\r\n");
+
+ fflush(stdout);
+}
+
+static void
+resp_copy(const char *filename)
+{
+ char buf[4096];
+ ssize_t sz;
+ int fd;
+
+ if ((fd = open(filename, O_RDONLY)) != -1) {
+ fflush(stdout);
+ while ((sz = read(fd, buf, sizeof(buf))) > 0)
+ write(STDOUT_FILENO, buf, sz);
+ close(fd);
+ }
+}
+
+static void
+resp_begin_html(int code, const char *msg, const char *file)
+{
+ char *cp;
+
+ resp_begin_http(code, msg);
+
+ printf("<!DOCTYPE html>\n"
+ "<html>\n"
+ "<head>\n"
+ " <meta charset=\"UTF-8\"/>\n"
+ " <meta name=\"viewport\""
+ " content=\"width=device-width, initial-scale=1.0\">\n"
+ " <link rel=\"stylesheet\" href=\"%s/mandoc.css\""
+ " type=\"text/css\" media=\"all\">\n"
+ " <title>",
+ CSS_DIR);
+ if (file != NULL) {
+ if ((cp = strrchr(file, '/')) != NULL)
+ file = cp + 1;
+ if ((cp = strrchr(file, '.')) != NULL) {
+ printf("%.*s(%s) - ", (int)(cp - file), file, cp + 1);
+ } else
+ printf("%s - ", file);
+ }
+ printf("%s</title>\n"
+ "</head>\n"
+ "<body>\n",
+ CUSTOMIZE_TITLE);
+
+ resp_copy(MAN_DIR "/header.html");
+}
+
+static void
+resp_end_html(void)
+{
+
+ resp_copy(MAN_DIR "/footer.html");
+
+ puts("</body>\n"
+ "</html>");
+}
+
+static void
+resp_searchform(const struct req *req, enum focus focus)
+{
+ int i;
+
+ printf("<form action=\"/%s\" method=\"get\" "
+ "autocomplete=\"off\" autocapitalize=\"none\">\n"
+ " <fieldset>\n"
+ " <legend>Manual Page Search Parameters</legend>\n",
+ scriptname);
+
+ /* Write query input box. */
+
+ printf(" <input type=\"search\" name=\"query\" value=\"");
+ if (req->q.query != NULL)
+ html_print(req->q.query);
+ printf( "\" size=\"40\"");
+ if (focus == FOCUS_QUERY)
+ printf(" autofocus");
+ puts(">");
+
+ /* Write submission buttons. */
+
+ printf( " <button type=\"submit\" name=\"apropos\" value=\"0\">"
+ "man</button>\n"
+ " <button type=\"submit\" name=\"apropos\" value=\"1\">"
+ "apropos</button>\n"
+ " <br/>\n");
+
+ /* Write section selector. */
+
+ puts(" <select name=\"sec\">");
+ for (i = 0; i < sec_MAX; i++) {
+ printf(" <option value=\"%s\"", sec_numbers[i]);
+ if (NULL != req->q.sec &&
+ 0 == strcmp(sec_numbers[i], req->q.sec))
+ printf(" selected=\"selected\"");
+ printf(">%s</option>\n", sec_names[i]);
+ }
+ puts(" </select>");
+
+ /* Write architecture selector. */
+
+ printf( " <select name=\"arch\">\n"
+ " <option value=\"default\"");
+ if (NULL == req->q.arch)
+ printf(" selected=\"selected\"");
+ puts(">All Architectures</option>");
+ for (i = 0; i < arch_MAX; i++) {
+ printf(" <option");
+ if (NULL != req->q.arch &&
+ 0 == strcmp(arch_names[i], req->q.arch))
+ printf(" selected=\"selected\"");
+ printf(">%s</option>\n", arch_names[i]);
+ }
+ puts(" </select>");
+
+ /* Write manpath selector. */
+
+ if (req->psz > 1) {
+ puts(" <select name=\"manpath\">");
+ for (i = 0; i < (int)req->psz; i++) {
+ printf(" <option");
+ if (strcmp(req->q.manpath, req->p[i]) == 0)
+ printf(" selected=\"selected\"");
+ printf(">");
+ html_print(req->p[i]);
+ puts("</option>");
+ }
+ puts(" </select>");
+ }
+
+ puts(" </fieldset>\n"
+ "</form>");
+}
+
+static int
+validate_urifrag(const char *frag)
+{
+
+ while ('\0' != *frag) {
+ if ( ! (isalnum((unsigned char)*frag) ||
+ '-' == *frag || '.' == *frag ||
+ '/' == *frag || '_' == *frag))
+ return 0;
+ frag++;
+ }
+ return 1;
+}
+
+static int
+validate_manpath(const struct req *req, const char* manpath)
+{
+ size_t i;
+
+ for (i = 0; i < req->psz; i++)
+ if ( ! strcmp(manpath, req->p[i]))
+ return 1;
+
+ return 0;
+}
+
+static int
+validate_arch(const char *arch)
+{
+ int i;
+
+ for (i = 0; i < arch_MAX; i++)
+ if (strcmp(arch, arch_names[i]) == 0)
+ return 1;
+
+ return 0;
+}
+
+static int
+validate_filename(const char *file)
+{
+
+ if ('.' == file[0] && '/' == file[1])
+ file += 2;
+
+ return ! (strstr(file, "../") || strstr(file, "/..") ||
+ (strncmp(file, "man", 3) && strncmp(file, "cat", 3)));
+}
+
+static void
+pg_index(const struct req *req)
+{
+
+ resp_begin_html(200, NULL, NULL);
+ resp_searchform(req, FOCUS_QUERY);
+ printf("<p>\n"
+ "This web interface is documented in the\n"
+ "<a class=\"Xr\" href=\"/%s%sman.cgi.8\">man.cgi(8)</a>\n"
+ "manual, and the\n"
+ "<a class=\"Xr\" href=\"/%s%sapropos.1\">apropos(1)</a>\n"
+ "manual explains the query syntax.\n"
+ "</p>\n",
+ scriptname, *scriptname == '\0' ? "" : "/",
+ scriptname, *scriptname == '\0' ? "" : "/");
+ resp_end_html();
+}
+
+static void
+pg_noresult(const struct req *req, int code, const char *http_msg,
+ const char *user_msg)
+{
+ resp_begin_html(code, http_msg, NULL);
+ resp_searchform(req, FOCUS_QUERY);
+ puts("<p>");
+ puts(user_msg);
+ puts("</p>");
+ resp_end_html();
+}
+
+static void
+pg_error_badrequest(const char *msg)
+{
+
+ resp_begin_html(400, "Bad Request", NULL);
+ puts("<h1>Bad Request</h1>\n"
+ "<p>\n");
+ puts(msg);
+ printf("Try again from the\n"
+ "<a href=\"/%s\">main page</a>.\n"
+ "</p>", scriptname);
+ resp_end_html();
+}
+
+static void
+pg_error_internal(void)
+{
+ resp_begin_html(500, "Internal Server Error", NULL);
+ puts("<p>Internal Server Error</p>");
+ resp_end_html();
+}
+
+static void
+pg_redirect(const struct req *req, const char *name)
+{
+ printf("Status: 303 See Other\r\n"
+ "Location: /");
+ if (*scriptname != '\0')
+ printf("%s/", scriptname);
+ if (strcmp(req->q.manpath, req->p[0]))
+ printf("%s/", req->q.manpath);
+ if (req->q.arch != NULL)
+ printf("%s/", req->q.arch);
+ http_encode(name);
+ if (req->q.sec != NULL) {
+ putchar('.');
+ http_encode(req->q.sec);
+ }
+ printf("\r\nContent-Type: text/html; charset=utf-8\r\n\r\n");
+}
+
+static void
+pg_searchres(const struct req *req, struct manpage *r, size_t sz)
+{
+ char *arch, *archend;
+ const char *sec;
+ size_t i, iuse;
+ int archprio, archpriouse;
+ int prio, priouse;
+
+ for (i = 0; i < sz; i++) {
+ if (validate_filename(r[i].file))
+ continue;
+ warnx("invalid filename %s in %s database",
+ r[i].file, req->q.manpath);
+ pg_error_internal();
+ return;
+ }
+
+ if (req->isquery && sz == 1) {
+ /*
+ * If we have just one result, then jump there now
+ * without any delay.
+ */
+ printf("Status: 303 See Other\r\n"
+ "Location: /");
+ if (*scriptname != '\0')
+ printf("%s/", scriptname);
+ if (strcmp(req->q.manpath, req->p[0]))
+ printf("%s/", req->q.manpath);
+ printf("%s\r\n"
+ "Content-Type: text/html; charset=utf-8\r\n\r\n",
+ r[0].file);
+ return;
+ }
+
+ /*
+ * In man(1) mode, show one of the pages
+ * even if more than one is found.
+ */
+
+ iuse = 0;
+ if (req->q.equal || sz == 1) {
+ priouse = 20;
+ archpriouse = 3;
+ for (i = 0; i < sz; i++) {
+ sec = r[i].file;
+ sec += strcspn(sec, "123456789");
+ if (sec[0] == '\0')
+ continue;
+ prio = sec_prios[sec[0] - '1'];
+ if (sec[1] != '/')
+ prio += 10;
+ if (req->q.arch == NULL) {
+ archprio =
+ ((arch = strchr(sec + 1, '/'))
+ == NULL) ? 3 :
+ ((archend = strchr(arch + 1, '/'))
+ == NULL) ? 0 :
+ strncmp(arch, "amd64/",
+ archend - arch) ? 2 : 1;
+ if (archprio < archpriouse) {
+ archpriouse = archprio;
+ priouse = prio;
+ iuse = i;
+ continue;
+ }
+ if (archprio > archpriouse)
+ continue;
+ }
+ if (prio >= priouse)
+ continue;
+ priouse = prio;
+ iuse = i;
+ }
+ resp_begin_html(200, NULL, r[iuse].file);
+ } else
+ resp_begin_html(200, NULL, NULL);
+
+ resp_searchform(req,
+ req->q.equal || sz == 1 ? FOCUS_NONE : FOCUS_QUERY);
+
+ if (sz > 1) {
+ puts("<table class=\"results\">");
+ for (i = 0; i < sz; i++) {
+ printf(" <tr>\n"
+ " <td>"
+ "<a class=\"Xr\" href=\"/");
+ if (*scriptname != '\0')
+ printf("%s/", scriptname);
+ if (strcmp(req->q.manpath, req->p[0]))
+ printf("%s/", req->q.manpath);
+ printf("%s\">", r[i].file);
+ html_print(r[i].names);
+ printf("</a></td>\n"
+ " <td><span class=\"Nd\">");
+ html_print(r[i].output);
+ puts("</span></td>\n"
+ " </tr>");
+ }
+ puts("</table>");
+ }
+
+ if (req->q.equal || sz == 1) {
+ puts("<hr>");
+ resp_show(req, r[iuse].file);
+ }
+
+ resp_end_html();
+}
+
+static void
+resp_catman(const struct req *req, const char *file)
+{
+ FILE *f;
+ char *p;
+ size_t sz;
+ ssize_t len;
+ int i;
+ int italic, bold;
+
+ if ((f = fopen(file, "r")) == NULL) {
+ puts("<p>You specified an invalid manual file.</p>");
+ return;
+ }
+
+ puts("<div class=\"catman\">\n"
+ "<pre>");
+
+ p = NULL;
+ sz = 0;
+
+ while ((len = getline(&p, &sz, f)) != -1) {
+ bold = italic = 0;
+ for (i = 0; i < len - 1; i++) {
+ /*
+ * This means that the catpage is out of state.
+ * Ignore it and keep going (although the
+ * catpage is bogus).
+ */
+
+ if ('\b' == p[i] || '\n' == p[i])
+ continue;
+
+ /*
+ * Print a regular character.
+ * Close out any bold/italic scopes.
+ * If we're in back-space mode, make sure we'll
+ * have something to enter when we backspace.
+ */
+
+ if ('\b' != p[i + 1]) {
+ if (italic)
+ printf("</i>");
+ if (bold)
+ printf("</b>");
+ italic = bold = 0;
+ html_putchar(p[i]);
+ continue;
+ } else if (i + 2 >= len)
+ continue;
+
+ /* Italic mode. */
+
+ if ('_' == p[i]) {
+ if (bold)
+ printf("</b>");
+ if ( ! italic)
+ printf("<i>");
+ bold = 0;
+ italic = 1;
+ i += 2;
+ html_putchar(p[i]);
+ continue;
+ }
+
+ /*
+ * Handle funny behaviour troff-isms.
+ * These grok'd from the original man2html.c.
+ */
+
+ if (('+' == p[i] && 'o' == p[i + 2]) ||
+ ('o' == p[i] && '+' == p[i + 2]) ||
+ ('|' == p[i] && '=' == p[i + 2]) ||
+ ('=' == p[i] && '|' == p[i + 2]) ||
+ ('*' == p[i] && '=' == p[i + 2]) ||
+ ('=' == p[i] && '*' == p[i + 2]) ||
+ ('*' == p[i] && '|' == p[i + 2]) ||
+ ('|' == p[i] && '*' == p[i + 2])) {
+ if (italic)
+ printf("</i>");
+ if (bold)
+ printf("</b>");
+ italic = bold = 0;
+ putchar('*');
+ i += 2;
+ continue;
+ } else if (('|' == p[i] && '-' == p[i + 2]) ||
+ ('-' == p[i] && '|' == p[i + 1]) ||
+ ('+' == p[i] && '-' == p[i + 1]) ||
+ ('-' == p[i] && '+' == p[i + 1]) ||
+ ('+' == p[i] && '|' == p[i + 1]) ||
+ ('|' == p[i] && '+' == p[i + 1])) {
+ if (italic)
+ printf("</i>");
+ if (bold)
+ printf("</b>");
+ italic = bold = 0;
+ putchar('+');
+ i += 2;
+ continue;
+ }
+
+ /* Bold mode. */
+
+ if (italic)
+ printf("</i>");
+ if ( ! bold)
+ printf("<b>");
+ bold = 1;
+ italic = 0;
+ i += 2;
+ html_putchar(p[i]);
+ }
+
+ /*
+ * Clean up the last character.
+ * We can get to a newline; don't print that.
+ */
+
+ if (italic)
+ printf("</i>");
+ if (bold)
+ printf("</b>");
+
+ if (i == len - 1 && p[i] != '\n')
+ html_putchar(p[i]);
+
+ putchar('\n');
+ }
+ free(p);
+
+ puts("</pre>\n"
+ "</div>");
+
+ fclose(f);
+}
+
+static void
+resp_format(const struct req *req, const char *file)
+{
+ struct manoutput conf;
+ struct mparse *mp;
+ struct roff_meta *meta;
+ void *vp;
+ int fd;
+ int usepath;
+
+ if (-1 == (fd = open(file, O_RDONLY, 0))) {
+ puts("<p>You specified an invalid manual file.</p>");
+ return;
+ }
+
+ mchars_alloc();
+ mp = mparse_alloc(MPARSE_SO | MPARSE_UTF8 | MPARSE_LATIN1 |
+ MPARSE_VALIDATE, MANDOC_OS_OTHER, req->q.manpath);
+ mparse_readfd(mp, fd, file);
+ close(fd);
+ meta = mparse_result(mp);
+
+ memset(&conf, 0, sizeof(conf));
+ conf.fragment = 1;
+ conf.style = mandoc_strdup(CSS_DIR "/mandoc.css");
+ usepath = strcmp(req->q.manpath, req->p[0]);
+ mandoc_asprintf(&conf.man, "/%s%s%s%s%%N.%%S",
+ scriptname, *scriptname == '\0' ? "" : "/",
+ usepath ? req->q.manpath : "", usepath ? "/" : "");
+
+ vp = html_alloc(&conf);
+ if (meta->macroset == MACROSET_MDOC)
+ html_mdoc(vp, meta);
+ else
+ html_man(vp, meta);
+
+ html_free(vp);
+ mparse_free(mp);
+ mchars_free();
+ free(conf.man);
+ free(conf.style);
+}
+
+static void
+resp_show(const struct req *req, const char *file)
+{
+
+ if ('.' == file[0] && '/' == file[1])
+ file += 2;
+
+ if ('c' == *file)
+ resp_catman(req, file);
+ else
+ resp_format(req, file);
+}
+
+static void
+pg_show(struct req *req, const char *fullpath)
+{
+ char *manpath;
+ const char *file;
+
+ if ((file = strchr(fullpath, '/')) == NULL) {
+ pg_error_badrequest(
+ "You did not specify a page to show.");
+ return;
+ }
+ manpath = mandoc_strndup(fullpath, file - fullpath);
+ file++;
+
+ if ( ! validate_manpath(req, manpath)) {
+ pg_error_badrequest(
+ "You specified an invalid manpath.");
+ free(manpath);
+ return;
+ }
+
+ /*
+ * Begin by chdir()ing into the manpath.
+ * This way we can pick up the database files, which are
+ * relative to the manpath root.
+ */
+
+ if (chdir(manpath) == -1) {
+ warn("chdir %s", manpath);
+ pg_error_internal();
+ free(manpath);
+ return;
+ }
+ free(manpath);
+
+ if ( ! validate_filename(file)) {
+ pg_error_badrequest(
+ "You specified an invalid manual file.");
+ return;
+ }
+
+ resp_begin_html(200, NULL, file);
+ resp_searchform(req, FOCUS_NONE);
+ resp_show(req, file);
+ resp_end_html();
+}
+
+static void
+pg_search(const struct req *req)
+{
+ struct mansearch search;
+ struct manpaths paths;
+ struct manpage *res;
+ char **argv;
+ char *query, *rp, *wp;
+ size_t ressz;
+ int argc;
+
+ /*
+ * Begin by chdir()ing into the root of the manpath.
+ * This way we can pick up the database files, which are
+ * relative to the manpath root.
+ */
+
+ if (chdir(req->q.manpath) == -1) {
+ warn("chdir %s", req->q.manpath);
+ pg_error_internal();
+ return;
+ }
+
+ search.arch = req->q.arch;
+ search.sec = req->q.sec;
+ search.outkey = "Nd";
+ search.argmode = req->q.equal ? ARG_NAME : ARG_EXPR;
+ search.firstmatch = 1;
+
+ paths.sz = 1;
+ paths.paths = mandoc_malloc(sizeof(char *));
+ paths.paths[0] = mandoc_strdup(".");
+
+ /*
+ * Break apart at spaces with backslash-escaping.
+ */
+
+ argc = 0;
+ argv = NULL;
+ rp = query = mandoc_strdup(req->q.query);
+ for (;;) {
+ while (isspace((unsigned char)*rp))
+ rp++;
+ if (*rp == '\0')
+ break;
+ argv = mandoc_reallocarray(argv, argc + 1, sizeof(char *));
+ argv[argc++] = wp = rp;
+ for (;;) {
+ if (isspace((unsigned char)*rp)) {
+ *wp = '\0';
+ rp++;
+ break;
+ }
+ if (rp[0] == '\\' && rp[1] != '\0')
+ rp++;
+ if (wp != rp)
+ *wp = *rp;
+ if (*rp == '\0')
+ break;
+ wp++;
+ rp++;
+ }
+ }
+
+ res = NULL;
+ ressz = 0;
+ if (req->isquery && req->q.equal && argc == 1)
+ pg_redirect(req, argv[0]);
+ else if (mansearch(&search, &paths, argc, argv, &res, &ressz) == 0)
+ pg_noresult(req, 400, "Bad Request",
+ "You entered an invalid query.");
+ else if (ressz == 0)
+ pg_noresult(req, 404, "Not Found", "No results found.");
+ else
+ pg_searchres(req, res, ressz);
+
+ free(query);
+ mansearch_free(res, ressz);
+ free(paths.paths[0]);
+ free(paths.paths);
+}
+
+int
+main(void)
+{
+ struct req req;
+ struct itimerval itimer;
+ const char *path;
+ const char *querystring;
+ int i;
+
+ /*
+ * The "rpath" pledge could be revoked after mparse_readfd()
+ * if the file desciptor to "/footer.html" would be opened
+ * up front, but it's probably not worth the complication
+ * of the code it would cause: it would require scattering
+ * pledge() calls in multiple low-level resp_*() functions.
+ */
+
+ if (pledge("stdio rpath", NULL) == -1) {
+ warn("pledge");
+ pg_error_internal();
+ return EXIT_FAILURE;
+ }
+
+ /* Poor man's ReDoS mitigation. */
+
+ itimer.it_value.tv_sec = 2;
+ itimer.it_value.tv_usec = 0;
+ itimer.it_interval.tv_sec = 2;
+ itimer.it_interval.tv_usec = 0;
+ if (setitimer(ITIMER_VIRTUAL, &itimer, NULL) == -1) {
+ warn("setitimer");
+ pg_error_internal();
+ return EXIT_FAILURE;
+ }
+
+ /*
+ * First we change directory into the MAN_DIR so that
+ * subsequent scanning for manpath directories is rooted
+ * relative to the same position.
+ */
+
+ if (chdir(MAN_DIR) == -1) {
+ warn("MAN_DIR: %s", MAN_DIR);
+ pg_error_internal();
+ return EXIT_FAILURE;
+ }
+
+ memset(&req, 0, sizeof(struct req));
+ req.q.equal = 1;
+ parse_manpath_conf(&req);
+
+ /* Parse the path info and the query string. */
+
+ if ((path = getenv("PATH_INFO")) == NULL)
+ path = "";
+ else if (*path == '/')
+ path++;
+
+ if (*path != '\0') {
+ parse_path_info(&req, path);
+ if (req.q.manpath == NULL || req.q.sec == NULL ||
+ *req.q.query == '\0' || access(path, F_OK) == -1)
+ path = "";
+ } else if ((querystring = getenv("QUERY_STRING")) != NULL)
+ parse_query_string(&req, querystring);
+
+ /* Validate parsed data and add defaults. */
+
+ if (req.q.manpath == NULL)
+ req.q.manpath = mandoc_strdup(req.p[0]);
+ else if ( ! validate_manpath(&req, req.q.manpath)) {
+ pg_error_badrequest(
+ "You specified an invalid manpath.");
+ return EXIT_FAILURE;
+ }
+
+ if (req.q.arch != NULL && validate_arch(req.q.arch) == 0) {
+ pg_error_badrequest(
+ "You specified an invalid architecture.");
+ return EXIT_FAILURE;
+ }
+
+ /* Dispatch to the three different pages. */
+
+ if ('\0' != *path)
+ pg_show(&req, path);
+ else if (NULL != req.q.query)
+ pg_search(&req);
+ else
+ pg_index(&req);
+
+ free(req.q.manpath);
+ free(req.q.arch);
+ free(req.q.sec);
+ free(req.q.query);
+ for (i = 0; i < (int)req.psz; i++)
+ free(req.p[i]);
+ free(req.p);
+ return EXIT_SUCCESS;
+}
+
+/*
+ * Translate PATH_INFO to a query.
+ */
+static void
+parse_path_info(struct req *req, const char *path)
+{
+ const char *name, *sec, *end;
+
+ req->isquery = 0;
+ req->q.equal = 1;
+ req->q.manpath = NULL;
+ req->q.arch = NULL;
+
+ /* Mandatory manual page name. */
+ if ((name = strrchr(path, '/')) == NULL)
+ name = path;
+ else
+ name++;
+
+ /* Optional trailing section. */
+ sec = strrchr(name, '.');
+ if (sec != NULL && isdigit((unsigned char)*++sec)) {
+ req->q.query = mandoc_strndup(name, sec - name - 1);
+ req->q.sec = mandoc_strdup(sec);
+ } else {
+ req->q.query = mandoc_strdup(name);
+ req->q.sec = NULL;
+ }
+
+ /* Handle the case of name[.section] only. */
+ if (name == path)
+ return;
+
+ /* Optional manpath. */
+ end = strchr(path, '/');
+ req->q.manpath = mandoc_strndup(path, end - path);
+ if (validate_manpath(req, req->q.manpath)) {
+ path = end + 1;
+ if (name == path)
+ return;
+ } else {
+ free(req->q.manpath);
+ req->q.manpath = NULL;
+ }
+
+ /* Optional section. */
+ if (strncmp(path, "man", 3) == 0 || strncmp(path, "cat", 3) == 0) {
+ path += 3;
+ end = strchr(path, '/');
+ free(req->q.sec);
+ req->q.sec = mandoc_strndup(path, end - path);
+ path = end + 1;
+ if (name == path)
+ return;
+ }
+
+ /* Optional architecture. */
+ end = strchr(path, '/');
+ if (end + 1 != name) {
+ pg_error_badrequest(
+ "You specified too many directory components.");
+ exit(EXIT_FAILURE);
+ }
+ req->q.arch = mandoc_strndup(path, end - path);
+ if (validate_arch(req->q.arch) == 0) {
+ pg_error_badrequest(
+ "You specified an invalid directory component.");
+ exit(EXIT_FAILURE);
+ }
+}
+
+/*
+ * Scan for indexable paths.
+ */
+static void
+parse_manpath_conf(struct req *req)
+{
+ FILE *fp;
+ char *dp;
+ size_t dpsz;
+ ssize_t len;
+
+ if ((fp = fopen("manpath.conf", "r")) == NULL) {
+ warn("%s/manpath.conf", MAN_DIR);
+ pg_error_internal();
+ exit(EXIT_FAILURE);
+ }
+
+ dp = NULL;
+ dpsz = 0;
+
+ while ((len = getline(&dp, &dpsz, fp)) != -1) {
+ if (dp[len - 1] == '\n')
+ dp[--len] = '\0';
+ req->p = mandoc_realloc(req->p,
+ (req->psz + 1) * sizeof(char *));
+ if ( ! validate_urifrag(dp)) {
+ warnx("%s/manpath.conf contains "
+ "unsafe path \"%s\"", MAN_DIR, dp);
+ pg_error_internal();
+ exit(EXIT_FAILURE);
+ }
+ if (strchr(dp, '/') != NULL) {
+ warnx("%s/manpath.conf contains "
+ "path with slash \"%s\"", MAN_DIR, dp);
+ pg_error_internal();
+ exit(EXIT_FAILURE);
+ }
+ req->p[req->psz++] = dp;
+ dp = NULL;
+ dpsz = 0;
+ }
+ free(dp);
+
+ if (req->p == NULL) {
+ warnx("%s/manpath.conf is empty", MAN_DIR);
+ pg_error_internal();
+ exit(EXIT_FAILURE);
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-04 05:23:55 +0000