/*-
 * Copyright (c) 2011-2025 Baptiste Daroussin <bapt@FreeBSD.org>
 * Copyright (c) 2014 Matthew Seaman <matthew@FreeBSD.org>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#if __has_include(<sys/capsicum.h>)
#include <sys/capsicum.h>
#define HAVE_CAPSICUM 1
#endif

#include <err.h>
#include <errno.h>
#include <fnmatch.h>
#include <getopt.h>
#include <pkg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include <regex.h>

#include <xmalloc.h>
#include "pkgcli.h"

void
usage_updating(void)
{
	fprintf(stderr, "Usage: pkg updating [-i] [-d YYYYMMDD] [-f file] [portname ...]\n");
	fprintf(stderr, "For more information see 'pkg help updating'.\n");

}

static char *
convert_re(const char *src)
{
	const char *p;
	char *q;
	bool brace_flag = false;
	size_t len = strlen(src);
	char *buf = xmalloc(len*2+1);

	for (p=src, q=buf; p < src+len; p++) {
		switch (*p) {
		case '*':
			*q++ = '.';
			*q++ = '*';
			break;
		case '?':
			*q++ = '.';
			break;
		case '.':
			*q++ = '\\';
			*q++ = '.';
			break;
		case '{':
			*q++='(';
			brace_flag=true;
			break;
		case ',':
			if (brace_flag)
				*q++='|';
			else
				*q++=*p;
			break;
		case '}':
			*q++=')';
			brace_flag=false;
			break;
		default:
			*q++ = *p;
		}
	}
	*q ='\0';
	return buf;
}

int
matcher(const char *affects, const char *origin, bool ignorecase)
{
	int i, n, count, ret, fnflags;
	bool was_spc;
	size_t len;
	char *re, *buf, *p, **words;

	len = strlen(affects);
	buf = xstrdup(affects);

	for (count = 0, was_spc = true, p = buf; p < buf + len ; p++) {
		if (isspace(*p)) {
			if (!was_spc)
				was_spc = true;
			*p = '\0';
		} else {
			if (was_spc) {
				count++;
				was_spc = false;
			}
		}
	}

	words = xmalloc(sizeof(char*)*count);

	for (i = 0, was_spc = true, p = buf; p < buf + len ; p++) {
		if (*p == '\0') {
			if (!was_spc)
				was_spc = true;
		} else {
			if (was_spc) {
				words[i++] = p;
				was_spc = false;
			}
		}
	}

	for(ret = 0, i = 0; i < count; i++) {
		n = strlen(words[i]);
		if (words[i][n-1] == ',') {
			words[i][n-1] = '\0';
		}

		fnflags = ignorecase ? FNM_CASEFOLD : 0;

		/* Try glob match in both directions: AFFECTS word as
		 * pattern against origin, and origin as pattern against
		 * AFFECTS word (for user-provided globs on the command
		 * line, issue #1786) */
		if (fnmatch(words[i], origin, fnflags) == 0 ||
		    fnmatch(origin, words[i], fnflags) == 0) {
			ret = 1;
			break;
		}

		/* Handle {a,b} brace expansion and (a|b) alternation
		 * via regex conversion (not supported by fnmatch) */
		if ((strchr(words[i], '{') != NULL && strchr(words[i], '}') != NULL) ||
		    (strchr(words[i], '(') != NULL && strchr(words[i], ')') != NULL)) {
			re = convert_re(words[i]);
			if (re != NULL) {
				regex_t reg;
				if (regcomp(&reg, re,
				    REG_EXTENDED | (ignorecase ? REG_ICASE : 0)) == 0) {
					if (regexec(&reg, origin, 0, NULL, 0) == 0)
						ret = 1;
					regfree(&reg);
				}
				free(re);
				if (ret)
					break;
			}
		}
	}

	free(words);
	free(buf);
	return (ret);
}

int
exec_updating(int argc, char **argv)
{
	char			*date = NULL;
	char			*dateline = NULL;
	char			*updatingfile = NULL;
	bool			caseinsensitive = false;
	charv_t 		 origins = vec_init();
	int			 ch;
	char			*line = NULL;
	size_t			 linecap = 0;
	char			*tmp;
	int			 head = 0;
	int			 found = 0;
	struct pkgdb		*db = NULL;
	struct pkg		*pkg = NULL;
	struct pkgdb_it		*it = NULL;
	FILE			*fd;
	int			 retcode = EXIT_SUCCESS;
#ifdef HAVE_CAPSICUM
	cap_rights_t rights;
#endif

	struct option longopts[] = {
		{ "date",	required_argument,	NULL,	'd' },
		{ "file",	required_argument,	NULL,	'f' },
		{ "case-insensitive",	no_argument,	NULL,	'i' },
		{ NULL,		0,			NULL,	0   },
	};

	while ((ch = getopt_long(argc, argv, "+d:f:i", longopts, NULL)) != -1) {
		switch (ch) {
		case 'd':
			date = optarg;
			break;
		case 'f':
			updatingfile = optarg;
			break;
		case 'i':
			caseinsensitive = true;
			break;
		default:
			usage_updating();
			return (EXIT_FAILURE);
		}
	}
	argc -= optind;
	argv += optind;

	/* checking date format */
	if (date != NULL)
		if (strlen(date) != 8 || strspn(date, "0123456789") != 8)
			err(EXIT_FAILURE, "Invalid date format");

	if (pkgdb_open(&db, PKGDB_DEFAULT_READONLY) != EPKG_OK)
		return (EXIT_FAILURE);

	if (!pkgdb_lock_or_fail(db, PKGDB_LOCK_READONLY))
		return (EXIT_FAILURE);

	if (updatingfile == NULL) {
		const char *portsdir = pkg_object_string(pkg_config_get("PORTSDIR"));
		if (portsdir == NULL) {
			retcode = EXIT_FAILURE;
			goto cleanup;
		}
		xasprintf(&updatingfile, "%s/UPDATING", portsdir);
	}

	fd = fopen(updatingfile, "r");
	if (fd == NULL) {
		warnx("Unable to open: %s", updatingfile);
		goto cleanup;
	}

#ifdef HAVE_CAPSICUM
	cap_rights_init(&rights, CAP_READ);
	if (cap_rights_limit(fileno(fd), &rights) < 0 && errno != ENOSYS ) {
		warn("cap_rights_limit() failed");
		fclose(fd);
		return (EXIT_FAILURE);
	}

#ifndef COVERAGE
	if (cap_enter() < 0 && errno != ENOSYS) {
		warn("cap_enter() failed");
		fclose(fd);
		return (EXIT_FAILURE);
	}
#endif
#endif

	if (argc == 0) {
		if ((it = pkgdb_query(db, NULL, MATCH_ALL)) == NULL) {
			retcode = EXIT_FAILURE;
			fclose(fd);
			goto cleanup;
		}

		while (pkgdb_it_next(it, &pkg, PKG_LOAD_BASIC) == EPKG_OK) {
			char *orig;
			pkg_asprintf(&orig, "%o", pkg);
			vec_push(&origins, orig);
		}
	} else {
		while (*argv) {
			char *orig = xstrdup(*argv);
			vec_push(&origins, orig);
			argv++;
		}
	}

	while (getline(&line, &linecap, fd) > 0) {
		if (strspn(line, "0123456789:") == 9) {
			free(dateline);
			dateline = xstrdup(line);
			found = 0;
			head = 1;
		} else if (head == 0) {
			continue;
		}

		tmp = NULL;
		if (found == 0) {
			if (strstr(line, "AFFECTS") != NULL) {
				vec_foreach(origins, i) {
					if (matcher(line, origins.d[i], caseinsensitive) != 0) {
						tmp = "";
						break;
					}
				}
				if (tmp == NULL)
					tmp = strcasestr(line, "all users\n");
				if (tmp == NULL)
					tmp = strcasestr(line, "all ports users\n");
				if (tmp != NULL) {
					if ((date != NULL) && strncmp(dateline, date, 8) < 0) {
						continue;
					}
					printf("%s%s",dateline, line);
					found = 1;
				}
			}
		} else {
			printf("%s",line);
		}
	}
	fclose(fd);

cleanup:
	vec_free_and_free(&origins, free);
	pkgdb_it_free(it);
	pkgdb_release_lock(db, PKGDB_LOCK_READONLY);
	pkgdb_close(db);
	pkg_free(pkg);
	free(line);
	free(dateline);

	return (retcode);
}