/*      $NetBSD: spec.c,v 1.6 1995/03/07 21:12:12 cgd Exp $     */
/*      $OpenBSD: spec.c,v 1.30 2023/08/11 05:07:28 guenther Exp $      */

/*-
 * Copyright (c) 1989, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/types.h>
#include <sys/stat.h>
#include <pwd.h>
#include <grp.h>
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <ctype.h>
#include <vis.h>
#include "mtree.h"
#include "extern.h"

int lineno;                             /* Current spec line number. */

static void      set(char *, NODE *);
static void      unset(char *, NODE *);

NODE *
spec(void)
{
        NODE *centry, *last;
        char *p;
        NODE ginfo, *root;
        int c_cur, c_next;
        char *buf, *tbuf = NULL;
        size_t len;

        last = root = NULL;
        bzero(&ginfo, sizeof(ginfo));
        centry = &ginfo;
        c_cur = c_next = 0;
        for (lineno = 1; (buf = fgetln(stdin, &len));
            ++lineno, c_cur = c_next, c_next = 0) {
                /* Null-terminate the line. */
                if (buf[len - 1] == '\n') {
                        buf[--len] = '\0';
                } else {
                        /* EOF with no newline. */
                        tbuf = malloc(len + 1);
                        memcpy(tbuf, buf, len);
                        tbuf[len] = '\0';
                        buf = tbuf;
                }

                /* Skip leading whitespace. */
                for (p = buf; isspace((unsigned char)*p); p++)
                        ;

                /* If nothing but whitespace or comment char, continue. */
                if (*p == '\0' || *p == '#')
                        continue;

                /* See if next line is continuation line. */
                if (buf[len - 1] == '\\') {
                        c_next = 1;
                        if (--len == 0)
                                continue;
                        buf[len] = '\0';
                }

#ifdef DEBUG
                (void)fprintf(stderr, "line %d: {%s}\n", lineno, p);
#endif
                if (c_cur) {
                        set(p, centry);
                        continue;
                }

                /* Grab file name, "$", "set", or "unset". */
                if ((p = strtok(p, "\n\t ")) == NULL)
                        error("missing field");

                if (p[0] == '/')
                        switch(p[1]) {
                        case 's':
                                if (strcmp(p + 1, "set"))
                                        break;
                                set(NULL, &ginfo);
                                continue;
                        case 'u':
                                if (strcmp(p + 1, "unset"))
                                        break;
                                unset(NULL, &ginfo);
                                continue;
                        }

                if (strchr(p, '/'))
                        error("slash character in file name");

                if (!strcmp(p, "..")) {
                        /* Don't go up, if haven't gone down. */
                        if (!root)
                                goto noparent;
                        if (last->type != F_DIR || last->flags & F_DONE) {
                                if (last == root)
                                        goto noparent;
                                last = last->parent;
                        }
                        last->flags |= F_DONE;
                        continue;

noparent:               error("no parent node");
                }

                len = strlen(p) + 1;    /* NUL in struct _node */
                if ((centry = calloc(1, sizeof(NODE) + len - 1)) == NULL)
                        error("%s", strerror(errno));
                *centry = ginfo;
#define MAGIC   "?*["
                if (strpbrk(p, MAGIC))
                        centry->flags |= F_MAGIC;
                if (strunvis(centry->name, p) == -1) {
                        fprintf(stderr,
                            "mtree: filename (%s) encoded incorrectly\n", p);
                        strlcpy(centry->name, p, len);
                }
                set(NULL, centry);

                if (!root) {
                        last = root = centry;
                        root->parent = root;
                } else if (last->type == F_DIR && !(last->flags & F_DONE)) {
                        centry->parent = last;
                        last = last->child = centry;
                } else {
                        centry->parent = last->parent;
                        centry->prev = last;
                        last = last->next = centry;
                }
        }
        free(tbuf);
        return (root);
}

static void
set(char *t, NODE *ip)
{
        int type;
        char *kw, *val = NULL;
        void *m;
        int value;
        u_int32_t fset, fclr;
        char *ep;
        size_t len;

        for (; (kw = strtok(t, "= \t\n")); t = NULL) {
                ip->flags |= type = parsekey(kw, &value);
                if (value && (val = strtok(NULL, " \t\n")) == NULL)
                        error("missing value");
                switch(type) {
                case F_CKSUM:
                        ip->cksum = strtoul(val, &ep, 10);
                        if (*ep)
                                error("invalid checksum %s", val);
                        break;
                case F_MD5:
                        ip->md5digest = strdup(val);
                        if (!ip->md5digest)
                                error("%s", strerror(errno));
                        break;
                case F_FLAGS:
                        if (!strcmp(val, "none")) {
                                ip->file_flags = 0;
                                break;
                        }
                        if (strtofflags(&val, &fset, &fclr))
                                error("%s", strerror(errno));
                        ip->file_flags = fset;
                        break;
                case F_GID:
                        ip->st_gid = strtoul(val, &ep, 10);
                        if (*ep)
                                error("invalid gid %s", val);
                        break;
                case F_GNAME:
                        if (gid_from_group(val, &ip->st_gid) == -1)
                            error("unknown group %s", val);
                        break;
                case F_IGN:
                        /* just set flag bit */
                        break;
                case F_MODE:
                        if ((m = setmode(val)) == NULL)
                                error("invalid file mode %s", val);
                        ip->st_mode = getmode(m, 0);
                        free(m);
                        break;
                case F_NLINK:
                        ip->st_nlink = strtoul(val, &ep, 10);
                        if (*ep)
                                error("invalid link count %s", val);
                        break;
                case F_RMD160:
                        ip->rmd160digest = strdup(val);
                        if (!ip->rmd160digest)
                                error("%s", strerror(errno));
                        break;
                case F_SHA1:
                        ip->sha1digest = strdup(val);
                        if (!ip->sha1digest)
                                error("%s", strerror(errno));
                        break;
                case F_SHA256:
                        ip->sha256digest = strdup(val);
                        if (!ip->sha256digest)
                                error("%s", strerror(errno));
                        break;
                case F_SIZE:
                        ip->st_size = strtoll(val, &ep, 10);
                        if (*ep)
                                error("invalid size %s", val);
                        break;
                case F_SLINK:
                        len = strlen(val) + 1;
                        if ((ip->slink = malloc(len)) == NULL)
                                error("%s", strerror(errno));
                        if (strunvis(ip->slink, val) == -1) {
                                fprintf(stderr,
                                    "mtree: filename (%s) encoded incorrectly\n", val);
                                strlcpy(ip->slink, val, len);
                        }
                        break;
                case F_TIME:
                        ip->st_mtim.tv_sec = strtoull(val, &ep, 10);
                        if (*ep != '.')
                                error("invalid time %s", val);
                        val = ep + 1;
                        ip->st_mtim.tv_nsec = strtoul(val, &ep, 10);
                        if (*ep)
                                error("invalid time %s", val);
                        break;
                case F_TYPE:
                        switch(*val) {
                        case 'b':
                                if (!strcmp(val, "block"))
                                        ip->type = F_BLOCK;
                                break;
                        case 'c':
                                if (!strcmp(val, "char"))
                                        ip->type = F_CHAR;
                                break;
                        case 'd':
                                if (!strcmp(val, "dir"))
                                        ip->type = F_DIR;
                                break;
                        case 'f':
                                if (!strcmp(val, "file"))
                                        ip->type = F_FILE;
                                if (!strcmp(val, "fifo"))
                                        ip->type = F_FIFO;
                                break;
                        case 'l':
                                if (!strcmp(val, "link"))
                                        ip->type = F_LINK;
                                break;
                        case 's':
                                if (!strcmp(val, "socket"))
                                        ip->type = F_SOCK;
                                break;
                        default:
                                error("unknown file type %s", val);
                        }
                        break;
                case F_UID:
                        ip->st_uid = strtoul(val, &ep, 10);
                        if (*ep)
                                error("invalid uid %s", val);
                        break;
                case F_UNAME:
                        if (uid_from_user(val, &ip->st_uid) == -1)
                            error("unknown user %s", val);
                        break;
                }
        }
}

static void
unset(char *t, NODE *ip)
{
        char *p;

        while ((p = strtok(t, "\n\t ")))
                ip->flags &= ~parsekey(p, NULL);
}