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cgi.c
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cgi.c
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/* $Id: cgi.c,v 1.132 2016/05/28 13:40:48 schwarze Exp $ */
/*
* Copyright (c) 2011, 2012 Kristaps Dzonsons <[email protected]>
* Copyright (c) 2014, 2015, 2016 Ingo Schwarze <[email protected]>
*
* 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.
*/
#include "config.h"
#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 "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 parse_manpath_conf(struct req *);
static void parse_path_info(struct req *req, const char *path);
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 *, 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 *);
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_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", "armish", "armv7",
"hppa", "hppa64", "i386", "landisk",
"loongson", "luna88k", "macppc", "mips64",
"octeon", "sgi", "socppc", "sparc",
"sparc64", "zaurus",
"amiga", "arc", "arm32", "atari",
"aviion", "beagle", "cats", "hp300",
"ia64", "mac68k", "mvme68k", "mvme88k",
"mvmeppc", "palm", "pc532", "pegasos",
"pmax", "powerpc", "solbourne", "sun3",
"vax", "wgrisc", "x68k"
};
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(""e;");
break;
case ('&'):
printf("&");
break;
case ('>'):
printf(">");
break;
case ('<'):
printf("<");
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 *qsd, *qsp;
char *key, *val;
size_t qsl;
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;
qsd = NULL;
qsl = strlen(qs);
/* If the query string was lavishly encoded, decode it. */
if (strcspn(qs, "&") == qsl && strcspn(qs, "%") != qsl) {
qsp = qsd = mandoc_malloc(qsl + 1);
while (*qs != '\0') {
if ( ! strncmp(qs, "%26", 3)) {
*qsp++ = '&';
qs += 3;
} else if (! strncmp(qs, "%25", 3)) {
qs += 3;
while (! strncmp(qs, "25", 2))
qs += 2;
if (! strncmp(qs, "26", 2)) {
qs += 2;
*qsp++ = '&';
} else
*qsp++ = '%';
} else {
*qsp++ = *qs++;
}
}
*qsp = '\0';
qs = qsd;
}
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++;
}
free(qsd);
qsd = NULL;
}
/*
* 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
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"
"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);
}
}
static void
resp_begin_html(int code, const char *msg)
{
resp_begin_http(code, msg);
printf("<!DOCTYPE html>\n"
"<html>\n"
"<head>\n"
"<meta charset=\"UTF-8\"/>\n"
"<link rel=\"stylesheet\" href=\"%s/mandoc.css\""
" type=\"text/css\" media=\"all\">\n"
"<title>%s</title>\n"
"</head>\n"
"<body>\n"
"<!-- Begin page content. //-->\n",
CSS_DIR, 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;
puts("<!-- Begin search form. //-->");
printf("<div id=\"mancgi\">\n"
"<form action=\"/%s\" method=\"get\">\n"
"<fieldset>\n"
"<legend>Manual Page Search Parameters</legend>\n",
scriptname);
/* Write query input box. */
printf("<input type=\"text\" 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 value=\"%s\"", arch_names[i]);
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("value=\"");
html_print(req->p[i]);
printf("\">");
html_print(req->p[i]);
puts("</option>");
}
puts("</select>");
}
puts("</fieldset>\n"
"</form>\n"
"</div>");
puts("<!-- End search 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;
if ( ! strcmp(manpath, "mandoc"))
return 1;
for (i = 0; i < req->psz; i++)
if ( ! strcmp(manpath, req->p[i]))
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);
resp_searchform(req, FOCUS_QUERY);
printf("<p>\n"
"This web interface is documented in the\n"
"<a href=\"/%s%smandoc/man8/man.cgi.8\">man.cgi</a>\n"
"manual, and the\n"
"<a href=\"/%s%smandoc/man1/apropos.1\">apropos</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, const char *msg)
{
resp_begin_html(200, NULL);
resp_searchform(req, FOCUS_QUERY);
puts("<p>");
puts(msg);
puts("</p>");
resp_end_html();
}
static void
pg_error_badrequest(const char *msg)
{
resp_begin_html(400, "Bad Request");
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");
puts("<p>Internal Server Error</p>");
resp_end_html();
}
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");
printf("Location: http://%s/%s%s%s/%s",
HTTP_HOST, scriptname,
*scriptname == '\0' ? "" : "/",
req->q.manpath, r[0].file);
printf("\r\n"
"Content-Type: text/html; charset=utf-8\r\n"
"\r\n");
return;
}
resp_begin_html(200, NULL);
resp_searchform(req,
req->q.equal || sz == 1 ? FOCUS_NONE : FOCUS_QUERY);
if (sz > 1) {
puts("<div class=\"results\">");
puts("<table>");
for (i = 0; i < sz; i++) {
printf("<tr>\n"
"<td class=\"title\">\n"
"<a href=\"/%s%s%s/%s",
scriptname, *scriptname == '\0' ? "" : "/",
req->q.manpath, r[i].file);
printf("\">");
html_print(r[i].names);
printf("</a>\n"
"</td>\n"
"<td class=\"desc\">");
html_print(r[i].output);
puts("</td>\n"
"</tr>");
}
puts("</table>\n"
"</div>");
}
/*
* In man(1) mode, show one of the pages
* even if more than one is found.
*/
if (req->q.equal || sz == 1) {
puts("<hr>");
iuse = 0;
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_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_man *man;
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, MANDOCLEVEL_BADARG, NULL, req->q.manpath);
mparse_readfd(mp, fd, file);
close(fd);
memset(&conf, 0, sizeof(conf));
conf.fragment = 1;
usepath = strcmp(req->q.manpath, req->p[0]);
mandoc_asprintf(&conf.man, "/%s%s%%N.%%S",
usepath ? req->q.manpath : "", usepath ? "/" : "");
mparse_result(mp, &man, NULL);
if (man == NULL) {
warnx("fatal mandoc error: %s/%s", req->q.manpath, file);
pg_error_internal();
mparse_free(mp);
mchars_free();
return;
}
vp = html_alloc(&conf);
if (man->macroset == MACROSET_MDOC) {
mdoc_validate(man);
html_mdoc(vp, man);
} else {
man_validate(man);
html_man(vp, man);
}
html_free(vp);
mparse_free(mp);
mchars_free();
free(conf.man);
}
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;
}
if (strcmp(manpath, "mandoc")) {
free(req->q.manpath);
req->q.manpath = manpath;
} else
free(manpath);
if ( ! validate_filename(file)) {
pg_error_badrequest(
"You specified an invalid manual file.");
return;
}
resp_begin_html(200, NULL);
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++;
}
}
if (0 == mansearch(&search, &paths, argc, argv, &res, &ressz))