sltar

commit 0c3b317cab86de9a9ac645d4155c7238956bfd0c
Author: gottox@rootkit.lan <unknown>
Date:   Wed, 19 Dec 2007 00:16:32 +0100

initial checkin
Diffstat:
Makefile
 | 
57
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++
config.mk
 | 
19
+++++++++++++++++++
tar.c
 | 
57
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++

3 files changed, 133 insertions(+), 0 deletions(-)
diff --git a/Makefile b/Makefile
@@ -0,0 +1,57 @@
+# tar - a minimal implementation of tar
+# (c) 2007 Enno Boland
+
+include config.mk
+
+SRC = tar.c
+OBJ = ${SRC:.c=.o}
+TARGET = tar
+
+all: options ${TARGET}
+
+options:
+	@echo spiceman build options:
+	@echo "CFLAGS   = ${CFLAGS}"
+	@echo "LDFLAGS  = ${LDFLAGS}"
+	@echo "CC       = ${CC}"
+
+${OBJ}: config.mk
+
+%.o: %.c
+	@echo CC $@
+	@${CC} -c ${CFLAGS} $<
+
+${TARGET}: ${OBJ}
+	@echo CC -o $@
+	@${CC} -o $@ ${OBJ} ${LDFLAGS}
+
+clean:
+	@echo cleaning
+	@rm -f -- ${OBJ} ${TARGET} ${TARGET}-${VERSION}.tar.gz
+
+dist: clean
+	@echo creating dist tarball
+	@mkdir -p ${TARGET}-${VERSION}
+	@cp -R LICENSE Makefile \
+		${TARGET}.1 ${SRC} ${TARGET}-${VERSION}
+	@tar -cf ${TARGET}-${VERSION}.tar ${TARGET}-${VERSION}
+	@gzip ${TARGET}-${VERSION}.tar
+	@rm -rf ${TARGET}-${VERSION}
+
+install: all
+	@echo installing executable file to ${DESTDIR}${PREFIX}/bin
+	@mkdir -p ${DESTDIR}${PREFIX}/bin
+	@cp -f spiceman ${DESTDIR}${PREFIX}/bin
+	@chmod 755 ${DESTDIR}${PREFIX}/bin/spiceman
+	@echo installing manual page to ${DESTDIR}${MANPREFIX}/man1
+	@mkdir -p ${DESTDIR}${MANPREFIX}/man1
+	@sed "s/VERSION/${VERSION}/g" < spiceman.1 > ${DESTDIR}${MANPREFIX}/man1/spiceman.1
+	@chmod 644 ${DESTDIR}${MANPREFIX}/man1/spiceman.1
+
+uninstall:
+	@echo removing executable file from ${DESTDIR}${PREFIX}/bin
+	@rm -f ${DESTDIR}${PREFIX}/bin/spiceman
+	@echo removing manual page from ${DESTDIR}${MANPREFIX}/man1
+	@rm -f ${DESTDIR}${MANPREFIX}/man1/spiceman.1
+
+.PHONY: all options clean dist install uninstall
diff --git a/config.mk b/config.mk
@@ -0,0 +1,19 @@
+# tar version
+VERSION = 0.0
+
+# Customize below to fit your system
+
+# paths
+PREFIX = /usr/local
+MANPREFIX = ${PREFIX}/share/man
+
+# includes and libs
+INCS = -I. -I/usr/include
+LIBS = -L/usr/lib -lc
+
+# flags
+CFLAGS = -static -Os -g -Wall -Werror ${INCS} -DVERSION=\"${VERSION}\"
+LDFLAGS = -g ${LIBS}
+
+# compiler and linker
+CC = cc
diff --git a/tar.c b/tar.c
@@ -0,0 +1,57 @@
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdio.h>
+
+#define USAGE { puts("tar [xt]"); exit(EXIT_FAILURE); }
+#define FORBLOCK(x,b) for(l = x; l > 0 && (n = read(0,(void *)(b),512)) > 0; l -= n)
+
+/* POSIX tar Header Block, from POSIX 1003.1-1990  */
+struct Header
+{
+	/* Header: 512 Byte */
+	char name[100];		/* 0-99 */
+	char mode[8];		/* 100-107 */
+	char uid[8];		/* 108-115 */
+	char gid[8];		/* 116-123 */
+	char size[12];		/* 124-135 */
+	char mtime[12];		/* 136-147 */
+	char chksum[8];		/* 148-155 */
+	char typeflag;		/* 156-156 */
+	char linkname[100];	/* 157-256 */
+	char magic[6];		/* 257-262 */
+	char version[2];	/* 263-264 */
+	char uname[32];		/* 265-296 */
+	char gname[32];		/* 297-328 */
+	char devmajor[8];	/* 329-336 */
+	char devminor[8];	/* 337-344 */
+	char prefix[155];	/* 345-499 */
+	char padding[12];	/* 500-512 */
+};
+
+int main(int argc, char *argv[]) {
+	int a, l, n;
+	char b[512];
+	struct Header h;
+
+	if((argc != 2 || (a = argv[1][0]) == '\0') ||
+			argv[1][1] != '\0' || (a != 't' && a != 'x'))
+		USAGE;
+	while(1) {
+		FORBLOCK(sizeof(h),&h);
+		if(*h.name == '\0')
+			break;
+		else if(l != 0) {
+			fputs("Garbage!\n",stderr);
+			return EXIT_FAILURE;
+		}
+		if(a == 't') {
+			puts(h.name);
+			FORBLOCK(strtoull(h.size,0,8),b);
+		}
+		else {
+			FORBLOCK(strtoull(h.size,0,8),b)
+				puts("open, write, close, chmod, chown");
+		}
+	}
+	return EXIT_SUCCESS;
+}