/*
 * Portions of this code are
 * Copyright (c) 1985 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#include <h/mh.h>
#include <h/utils.h>
#include <pwd.h>
#include <errno.h>

static FILE *cfile;

#ifndef MAXHOSTNAMELEN
# define MAXHOSTNAMELEN 64
#endif

#define	DEFAULT	1
#define	LOGIN	2
#define	PASSWD	3
#define	ACCOUNT 4
#define MACDEF  5
#define	ID	10
#define	MACH	11

static char tokval[100];

struct toktab {
    char *tokstr;
    int tval;
};

static struct toktab toktabs[] = {
    { "default",  DEFAULT },
    { "login",    LOGIN },
    { "password", PASSWD },
    { "passwd",   PASSWD },
    { "account",  ACCOUNT },
    { "machine",  MACH },
    { "macdef",   MACDEF },
    { 0,          0 }
};

/*
 * prototypes
 */
static int token(void);


void
ruserpass(char *host, char **aname, char **apass)
{
    char *hdir, buf[BUFSIZ];
    int t, usedefault = 0;
    struct stat stb;

    hdir = getenv("HOME");
    if (hdir == NULL)
	hdir = ".";
    snprintf(buf, sizeof(buf), "%s/.netrc", hdir);
    cfile = fopen(buf, "r");
    if (cfile == NULL) {
	if (errno != ENOENT)
	    perror(buf);
	goto done;
    }

    while ((t = token())) {
	switch(t) {
	case DEFAULT:
	    usedefault = 1;
	    /* FALL THROUGH */

	case MACH:
	    if (!usedefault) {
		if (token() != ID)
		    continue;
		/*
		 * Allow match either for user's host name.
		 */
		if (mh_strcasecmp(host, tokval) == 0)
		    goto match;
		continue;
	    }
match:
	    while ((t = token()) && t != MACH && t != DEFAULT) {
		switch(t) {
		case LOGIN:
		    if (token() && *aname == 0) {
			*aname = mh_xmalloc((size_t) strlen(tokval) + 1);
			strcpy(*aname, tokval);
		    }
		    break;
		case PASSWD:
		    if (fstat(fileno(cfile), &stb) >= 0 &&
			(stb.st_mode & 077) != 0) {
			/* We make this a fatal error to force the user to correct it */
			advise(NULL, "Error - ~/.netrc file must not be world or group readable.");
			adios(NULL, "Remove password or correct file permissions.");
		    }
		    if (token() && *apass == 0) {
			*apass = mh_xmalloc((size_t) strlen(tokval) + 1);
			strcpy(*apass, tokval);
		    }
		    break;
		case ACCOUNT:
		    break;

		case MACDEF:
		    goto done_close;
		    break;
		default:
		    fprintf(stderr, "Unknown .netrc keyword %s\n", tokval);
		    break;
		}
	    }
	    goto done;
	}
    }

done_close:
    fclose(cfile);

done:
    if (!*aname) {
	char tmp[80];
	char *myname;

	if ((myname = getlogin()) == NULL) {
	    struct passwd *pp;

	    if ((pp = getpwuid (getuid())) != NULL)
		myname = pp->pw_name;
	}
	printf("Name (%s:%s): ", host, myname);

	fgets(tmp, sizeof(tmp) - 1, stdin);
	tmp[strlen(tmp) - 1] = '\0';
	if (*tmp != '\0') {
	    myname = tmp;
	}

	*aname = mh_xmalloc((size_t) strlen(myname) + 1);
	strcpy (*aname, myname);
    }

    if (!*apass) {
	char prompt[256];
	char *mypass;

	snprintf(prompt, sizeof(prompt), "Password (%s:%s): ", host, *aname);
	mypass = nmh_getpass(prompt);
	
	if (*mypass == '\0') {
	    mypass = *aname;
	}

	*apass = mh_xmalloc((size_t) strlen(mypass) + 1);
	strcpy (*apass, mypass);
    }

}

static int
token(void)
{
    char *cp;
    int c;
    struct toktab *t;

    if (feof(cfile))
	return (0);
    while ((c = getc(cfile)) != EOF &&
	   (c == '\n' || c == '\t' || c == ' ' || c == ','))
	continue;
    if (c == EOF)
	return (0);
    cp = tokval;
    if (c == '"') {
	while ((c = getc(cfile)) != EOF && c != '"') {
	    if (c == '\\')
		c = getc(cfile);
	    *cp++ = c;
	}
    } else {
	*cp++ = c;
	while ((c = getc(cfile)) != EOF
	       && c != '\n' && c != '\t' && c != ' ' && c != ',') {
	    if (c == '\\')
		c = getc(cfile);
	    *cp++ = c;
	}
    }
    *cp = 0;
    if (tokval[0] == 0)
	return (0);
    for (t = toktabs; t->tokstr; t++)
	if (!strcmp(t->tokstr, tokval))
	    return (t->tval);
    return (ID);
}