/* $Id: local.c,v 1.14 2002/02/04 15:18:42 ukai Exp $ */
#include "fm.h"
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <signal.h>
#include <errno.h>
#ifdef HAVE_READLINK
#include <unistd.h>
#endif				/* HAVE_READLINK */
#ifdef __EMX__
#include <limits.h>		/* _MAX_PATH ? */
#endif				/* __EMX__ */
#include "local.h"

#define CGIFN_NORMAL     0
#define CGIFN_DROOT      1
#define CGIFN_CGIBIN     2
#define CGIFN_MODE(x) ((x)&3)

#define CGIFN_CONTAIN_SLASH 4

/* setup cookie for local CGI */
void
setLocalCookie()
{
    Str buf;
    char hostname[256];
    gethostname(hostname, 256);

    buf = Sprintf("%d.%ld@%s", getpid(), lrand48(), hostname);
    Local_cookie = buf->ptr;
}

Buffer *
dirBuffer(char *dname)
{
    Str tmp;
    DIR *d;
    Directory *dir;
    struct stat st;
    char **flist;
    char *p, *qdir;
    Str fbuf = Strnew();
#ifdef HAVE_LSTAT
    struct stat lst;
#ifdef HAVE_READLINK
    char lbuf[1024];
#endif				/* HAVE_READLINK */
#endif				/* HAVE_LSTAT */
    int i, l, nrow = 0, n = 0, maxlen = 0;
    int nfile, nfile_max = 100;
    Str dirname;
    Buffer *buf;

    d = opendir(dname);
    if (d == NULL)
	return NULL;
    dirname = Strnew_charp(dname);
    qdir = html_quote(Str_conv_from_system(dirname)->ptr);
    tmp =
	Sprintf
	("<title>Directory list of %s</title><h1>Directory list of %s</h1>\n",
	 qdir, qdir);
    flist = New_N(char *, nfile_max);
    nfile = 0;
    while ((dir = readdir(d)) != NULL) {
	flist[nfile++] = allocStr(dir->d_name, -1);
	if (nfile == nfile_max) {
	    nfile_max *= 2;
	    flist = New_Reuse(char *, flist, nfile_max);
	}
	if (multicolList) {
	    l = strlen(dir->d_name);
	    if (l > maxlen)
		maxlen = l;
	    n++;
	}
    }

    if (multicolList) {
	l = COLS / (maxlen + 2);
	if (!l)
	    l = 1;
	nrow = (n + l - 1) / l;
	n = 1;
	Strcat_charp(tmp, "<TABLE CELLPADDING=0><TR VALIGN=TOP>\n");
    }
    qsort((void *)flist, nfile, sizeof(char *), strCmp);
    for (i = 0; i < nfile; i++) {
	p = flist[i];
	if (strcmp(p, ".") == 0)
	    continue;
	Strcopy(fbuf, dirname);
	if (Strlastchar(fbuf) != '/')
	    Strcat_char(fbuf, '/');
	Strcat_charp(fbuf, p);
#ifdef HAVE_LSTAT
	if (lstat(fbuf->ptr, &lst) < 0)
	    continue;
#endif				/* HAVE_LSTAT */
	if (stat(fbuf->ptr, &st) < 0)
	    continue;
	if (multicolList) {
	    if (n == 1)
		Strcat_charp(tmp, "<TD><NOBR>");
	}
	else {
	    if (S_ISDIR(st.st_mode))
		Strcat_charp(tmp, "[DIR]&nbsp; ");
#ifdef HAVE_LSTAT
	    else if (S_ISLNK(lst.st_mode))
		Strcat_charp(tmp, "[LINK] ");
#endif				/* HAVE_LSTAT */
	    else
		Strcat_charp(tmp, "[FILE] ");
	}
	Strcat_m_charp(tmp, "<A HREF=\"", file_to_url(fbuf->ptr), NULL);
	if (S_ISDIR(st.st_mode))
	    Strcat_char(tmp, '/');
	Strcat_m_charp(tmp, "\">", html_quote(conv_from_system(p)), NULL);
	if (S_ISDIR(st.st_mode))
	    Strcat_char(tmp, '/');
	Strcat_charp(tmp, "</a>");
	if (multicolList) {
	    if (n++ == nrow) {
		Strcat_charp(tmp, "</NOBR></TD>\n");
		n = 1;
	    }
	    else {
		Strcat_charp(tmp, "<BR>\n");
	    }
	}
	else {
#if defined(HAVE_LSTAT) && defined(HAVE_READLINK)
	    if (S_ISLNK(lst.st_mode)) {
		if ((l = readlink(fbuf->ptr, lbuf, sizeof(lbuf))) > 0) {
		    lbuf[l] = '\0';
		    Strcat_m_charp(tmp, " -> ",
				   html_quote(conv_from_system(lbuf)), NULL);
		    if (S_ISDIR(st.st_mode))
			Strcat_char(tmp, '/');
		}
	    }
#endif				/* HAVE_LSTAT && HAVE_READLINK */
	    Strcat_charp(tmp, "<br>\n");
	}
    }
    if (multicolList) {
	Strcat_charp(tmp, "</TR></TABLE>\n");
    }

    buf = loadHTMLString(tmp);
#ifdef JP_CHARSET
    if (buf)
	buf->document_code = SystemCode;
#endif
    return buf;
}

static int
check_local_cgi(char *file, int status)
{
    struct stat st;

    if (status & CGIFN_CONTAIN_SLASH) {
	/* local CGI file must be just under /cgi-bin/
	 * or /$LIB/
	 */
	return -1;
    }
#ifdef __EMX__
    if (CGIFN_MODE(status) != CGIFN_CGIBIN) {
	char tmp[_MAX_PATH];
	int len;

	_abspath(tmp, w3m_lib_dir(), _MAX_PATH);	/* Translate '\\' to '/' */
	len = strlen(tmp);
	while (len > 1 && tmp[len - 1] == '/')
	    len--;
	if (strnicmp(file, tmp, len) ||	/* and ignore case  */
	    (file[len] != '/'))
	    return -1;
    }
#else				/* not __EMX__ */
    if (CGIFN_MODE(status) != CGIFN_CGIBIN) {
	char *tmp = Strnew_charp(w3m_lib_dir())->ptr;
	int len = strlen(tmp);

	while (len > 1 && tmp[len - 1] == '/')
	    len--;
	if (strncmp(file, tmp, len) || (file[len] != '/'))
	    /* 
	     * a local-CGI script should be located on either
	     * /cgi-bin/ directory or LIB_DIR (typically /usr/local/lib/w3m).
	     */
	    return -1;
    }
#endif				/* not __EMX__ */
    if (stat(file, &st) < 0)
	return -1;
    if ((st.st_uid == geteuid() && (st.st_mode & S_IXUSR)) || (st.st_gid == getegid() && (st.st_mode & S_IXGRP)) || (st.st_mode & S_IXOTH)) {	/* executable */
	return 0;
    }
    return -1;
}

void
set_environ(char *var, char *value)
{
#ifdef HAVE_SETENV
    if (var != NULL && value != NULL)
	setenv(var, value, 1);
#else				/* not HAVE_SETENV */
#ifdef HAVE_PUTENV
    Str tmp = Strnew_m_charp(var, "=", value, NULL);
    putenv(tmp->ptr);
#else				/* not HAVE_PUTENV */
    extern char **environ;
    char **ne;
    char *p;
    int i, l, el;
    char **e, **newenv;

    /* I have no setenv() nor putenv() */
    /* This part is taken from terms.c of skkfep */
    l = strlen(var);
    for (e = environ, i = 0; *e != NULL; e++, i++) {
	if (strncmp(e, var, l) == 0 && (*e)[l] == '=') {
	    el = strlen(*e) - l - 1;
	    if (el >= strlen(value)) {
		strcpy(*e + l + 1, value);
		return 0;
	    }
	    else {
		for (; *e != NULL; e++, i++) {
		    *e = *(e + 1);
		}
		i--;
		break;
	    }
	}
    }
    newenv = (char **)GC_malloc((i + 2) * sizeof(char *));
    if (newenv == NULL)
	return;
    for (e = environ, ne = newenv; *e != NULL; *(ne++) = *(e++)) ;
    *(ne++) = p;
    *ne = NULL;
    environ = newenv;
#endif				/* not HAVE_PUTENV */
#endif				/* not HAVE_SETENV */
}

static void
set_cgi_environ(char *name, char *fn, char *req_uri)
{
    set_environ("SERVER_SOFTWARE", w3m_version);
    set_environ("SERVER_PROTOCOL", "HTTP/1.0");
    set_environ("SERVER_NAME", "localhost");
    set_environ("SERVER_PORT", "80");	/* dummy */
    set_environ("REMOTE_HOST", "localhost");
    set_environ("REMOTE_ADDR", "127.0.0.1");
    set_environ("GATEWAY_INTERFACE", "CGI/1.1");

    set_environ("SCRIPT_NAME", name);
    set_environ("SCRIPT_FILENAME", fn);
    set_environ("REQUEST_URI", req_uri);
    set_environ("LOCAL_COOKIE", Local_cookie);
}

static Str
checkPath(char *fn, char *path)
{
    Str tmp;
    struct stat st;
    while (*path) {
	tmp = Strnew();
	while (*path && *path != ':')
	    Strcat_char(tmp, *path++);
	if (*path == ':')
	    path++;
	if (Strlastchar(tmp) != '/')
	    Strcat_char(tmp, '/');
	Strcat_charp(tmp, fn);
	if (stat(tmp->ptr, &st) == 0)
	    return tmp;
    }
    return NULL;
}

static char *
cgi_filename(char *fn, int *status)
{
    Str tmp;
    struct stat st;
    if (cgi_bin != NULL && strncmp(fn, "/cgi-bin/", 9) == 0) {
	*status = CGIFN_CGIBIN;
	if (strchr(fn + 9, '/'))
	    *status |= CGIFN_CONTAIN_SLASH;
	tmp = checkPath(fn + 9, cgi_bin);
	if (tmp == NULL)
	    return fn;
	return tmp->ptr;
    }
    if (strncmp(fn, "/$LIB/", 6) == 0) {
	*status = CGIFN_NORMAL;
	tmp = Strnew_charp(w3m_lib_dir());
	fn += 5;
	if (strchr(fn + 1, '/'))
	    *status |= CGIFN_CONTAIN_SLASH;
	if (Strlastchar(tmp) == '/')
	    fn++;
	Strcat_charp(tmp, fn);
	return tmp->ptr;
    }
    if (*fn == '/' && document_root != NULL && stat(fn, &st) < 0) {
	*status = CGIFN_DROOT;
	if (strchr(fn + 1, '/'))
	    *status |= CGIFN_CONTAIN_SLASH;
	tmp = Strnew_charp(document_root);
	if (Strlastchar(tmp) != '/')
	    Strcat_char(tmp, '/');
	Strcat_charp(tmp, fn);
	return tmp->ptr;
    }
    *status = CGIFN_NORMAL;
    return fn;
}

static pid_t
localcgi_popen_r(FILE ** p_fp)
{
    int fd[2];
    FILE *fp;
    pid_t pid;
    Str emsg;

    if (pipe(fd) < 0) {
	emsg = Sprintf("localcgi_popen_r: pipe: %s", strerror(errno));
	disp_err_message(emsg->ptr, FALSE);
	return (pid_t) - 1;
    }

    flush_tty();
    if ((pid = fork()) < 0) {
	emsg = Sprintf("localcgi_popen_r: fork: %s", strerror(errno));
	disp_err_message(emsg->ptr, FALSE);
	close(fd[0]);
	close(fd[1]);
	return (pid_t) - 1;
    }
    else if (!pid) {
	close_tty();
	dup2(fd[1], 1);

	if (fd[1] > 1)
	    close(fd[1]);

	close(fd[0]);
    }
    else {
	close(fd[1]);

	if (!(fp = fdopen(fd[0], "r"))) {
	    emsg =
		Sprintf("localcgi_popen_r: fdopen(%d, \"r\"): %s", fd[0],
			strerror(errno));
	    disp_err_message(emsg->ptr, FALSE);
	    kill(pid, SIGTERM);
	    close(fd[0]);
	    return (pid_t) - 1;
	}

	*p_fp = fp;
    }

    return pid;
}

FILE *
localcgi_post(char *uri, char *qstr, FormList *request, char *referer)
{
    FILE *f, *f1;
    Str tmp1;
    int status;
    pid_t pid;
    char *file;

    file = cgi_filename(uri, &status);
    if (check_local_cgi(file, status) < 0)
	return NULL;
    tmp1 = tmpfname(TMPF_DFL, NULL);
    f1 = fopen(tmp1->ptr, "w");
    if (f1 == NULL)
	return NULL;
    pushText(fileToDelete, tmp1->ptr);
    if ((pid = localcgi_popen_r(&f))) {
	fclose(f1);
	return pid > 0 ? f : NULL;
    }
    if (qstr == NULL) {
	set_cgi_environ(uri, file, uri);
    }
    else {
	set_cgi_environ(uri, file, Strnew_m_charp(uri, "?", qstr, NULL)->ptr);
    }
    set_environ("REQUEST_METHOD", "POST");
    if (qstr)
	set_environ("QUERY_STRING", qstr);
    set_environ("CONTENT_LENGTH", Sprintf("%d", request->length)->ptr);
    if (referer && referer != NO_REFERER)
	set_environ("HTTP_REFERER", referer);
    if (request->enctype == FORM_ENCTYPE_MULTIPART) {
	set_environ("CONTENT_TYPE",
		    Sprintf("multipart/form-data; boundary=%s",
			    request->boundary)->ptr);
    }
    else {
	set_environ("CONTENT_TYPE", "application/x-www-form-urlencoded");
    }
    if (request->enctype == FORM_ENCTYPE_MULTIPART) {
	FILE *fd;
	int c;
	fd = fopen(request->body, "r");
	if (fd != NULL) {
	    while ((c = fgetc(fd)) != EOF)
		fputc(c, f1);
	    fclose(fd);
	}
    }
    else {
	fputs(request->body, f1);
    }
    fclose(f1);
    freopen(tmp1->ptr, "r", stdin);
#ifdef HAVE_CHDIR		/* ifndef __EMX__ ? */
    chdir(mydirname(file));
#endif
    execl(file, mybasename(file), NULL);
    fprintf(stderr, "execl(\"%s\", \"%s\", NULL): %s\n",
	    file, mybasename(file), strerror(errno));
    exit(1);
    return NULL;
}

FILE *
localcgi_get(char *uri, char *request, char *referer)
{
    FILE *f;
    int status;
    pid_t pid;
    char *file;

    file = cgi_filename(uri, &status);
    if (check_local_cgi(file, status) < 0)
	return NULL;
    if ((pid = localcgi_popen_r(&f)) < 0)
	return NULL;
    else if (pid)
	return f;
    if (request == NULL) {
	set_cgi_environ(Strnew_charp(uri)->ptr, file, Strnew_charp(uri)->ptr);
    }
    else {
	set_cgi_environ(Strnew_charp(uri)->ptr, file,
			Strnew_m_charp(uri, "?", request, NULL)->ptr);
    }
    if (referer && referer != NO_REFERER)
	set_environ("HTTP_REFERER", referer);
    set_environ("REQUEST_METHOD", "GET");
    set_environ("QUERY_STRING", request ? request : "");
    freopen(DEV_NULL_PATH, "r", stdin);
#ifdef HAVE_CHDIR		/* ifndef __EMX__? */
    chdir(mydirname(file));
#endif
    execl(file, mybasename(file), NULL);
    fprintf(stderr, "execl(\"%s\", \"%s\", NULL): %s\n",
	    file, mybasename(file), strerror(errno));
    exit(1);
    return NULL;
}