crashy and buggy skeletonHEADmaster

1 files changed, 107 insertions, 0 deletions

diff --git a/pathchk.c b/pathchk.c
new file mode 100644
index 0000000..0bd5b00
--- /dev/null
+++ b/pathchk.c
@@ -0,0 +1,107 @@
+#define _XOPEN_SOURCE 700
+#include <errno.h>
+#include <limits.h>
+#include <locale.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+static int pathchk(const char *pathname, int posix_max, int dangerous_globs)
+{
+	size_t pathlen = strlen(pathname);
+	size_t chklen = 0;
+	char chkpath[pathlen + 1];
+	char chkname[pathlen + 1];
+
+	if (dangerous_globs && pathlen == 0) {
+		fprintf(stderr, "pathchk: empty pathname\n");
+		return 0;
+	}
+
+	if (pathname[0] == '/') {
+		strcpy(chkpath, "/");
+		chklen = 1;
+	} else {
+		memset(chkpath, 0, sizeof(chkpath));
+		for (chklen = 0; pathname[chklen] != '/' && chklen < pathlen; chklen++) {
+			chkpath[chklen] = pathname[chklen];
+		}
+	}
+
+	while (chklen < pathlen) {
+		memset(chkname, 0, sizeof(chkname));
+		size_t namelen = 0;
+		for (size_t namelen = 0; pathname[namelen + chklen] != '/' && namelen + chklen < pathlen; namelen++) {
+			chkname[namelen] = pathname[namelen + chklen];
+		}
+
+		#if 0
+		printf("checking '%s' in '%s'\n", chkname, chkpath);
+		#endif
+
+		size_t path_max = posix_max ? _POSIX_PATH_MAX : pathconf(chkpath, _PC_PATH_MAX);
+		if (namelen + chklen + 1 > path_max) {
+			fprintf(stderr, "pathchk: %s/%s is longer than %s\n", chkpath, chkname, posix_max ? "_POSIX_PATH_MAX" : "PATH_MAX");
+		}
+
+		size_t name_max = posix_max ? _POSIX_NAME_MAX : pathconf(chkpath, _PC_NAME_MAX);
+		if (namelen > name_max) {
+			fprintf(stderr, "pathchk: %s/%s is longer than %s\n", chkpath, chkname, posix_max ? "_POSIX_NAME_MAX" : "NAME_MAX");
+		}
+
+		if (!posix_max && !(access(chkpath, X_OK) == 0)) {
+			fprintf(stderr, "pathchk: %s is not searchable\n", chkpath);
+		}
+
+		if (posix_max) {
+			/* check portable character set */
+		} else {
+			/* check directory allowed characters */
+		}
+
+		if (dangerous_globs && chkname[0] == '-') {
+			fprintf(stderr, "pathchk: %s begins with '-'\n", chkname);
+		}
+
+		strcat(chkpath, "/");
+		strcat(chkpath, chkname);
+		chklen += (namelen + 2);
+	}
+	
+	return 0;
+}
+
+int main(int argc, char *argv[])
+{
+	int posix_max = 0;
+	int dangerous_globs = 0;
+	int c;
+
+	setlocale(LC_ALL, "");
+
+	while ((c = getopt(argc, argv, "pP")) != -1) {
+		switch (c) {
+		case 'p':
+			posix_max = 1;
+			break;
+
+		case 'P':
+			dangerous_globs = 1;
+			break;
+
+		default:
+			return 1;
+		}
+	}
+
+	if (optind >= argc) {
+		return 1;
+	}
+
+	int ret = 0;
+	do {
+		ret |= pathchk(argv[optind++], posix_max, dangerous_globs);
+	} while (argv[optind]);
+
+	return ret;
+}