Add colors to error output and improve messages

* Add more section types to prevent "unknown" from printing
* Add alloc, exec, and write flags of sections to output table

AUR/PKGBUILD

@@ -1,14 +1,14 @@
 # Maintainer: Mario Hüttel <mario (dot) huettel (!) gmx (dot) net>
 
 pkgname=patchelfcrc
-pkgver=5e7f697
+pkgver=v1.0.0_rc1
 pkgrel=1
 pkgdesc="Tool for patching CRC checksums of sections into ELF binaries"
 arch=('i686' 'x86_64')
 url="https://git.shimatta.de/mhu/patchelfcrc"
 licence=('GPLv2')
 depends=('libelf' 'libxml2')
-makedepends=('cmake' 'pandoc' 'git' 'gvim')
+makedepends=('cmake' 'pandoc' 'git' 'gvim' 'bash')
 provides=('patchelfcrc')
 source=("${pkgname}-git"::"git+https://git.shimatta.de/mhu/patchelfcrc" "git+https://git.shimatta.de/3rd-party/libfort.git" "git+https://git.shimatta.de/mhu/linklist-lib")
 sha1sums=('SKIP' 'SKIP' 'SKIP')

include/patchelfcrc/reporting.h

@@ -21,14 +21,25 @@
 
 #include <stdbool.h>
 
-#define print_err(fmt, ...) fprintf(stderr, "[ERR] " fmt, ## __VA_ARGS__)
+/**
+ * @brief Setting for reporting to console.
+ */
+enum reporting_color_mode {
+    COLOR_MODE_DETECT, /**< @brief Automatically detect if tty. If tty, color is used */
+    COLOR_MODE_COLOR, /**< @brief Force color mode on stderr */
+    COLOR_MODE_COLOR_OFF, /**< @brief Force no color on stderr */
+};
 
-#define print_warn(fmt, ...) fprintf(stderr, "[WARN] " fmt, ## __VA_ARGS__)
+void print_err(const char *fmt, ...);
+
+void print_warn(const char *fmt, ...);
 
 void print_debug(const char *fmt, ...);
 
-void reporting_enable_verbose(void);
+void reporting_enable_verbose(bool state);
 
 bool reporting_get_verbosity(void);
 
+void reporting_init(enum reporting_color_mode mode);
+
 #endif /* _REPORTING_H_ */

man/CMakeLists.txt

@@ -10,10 +10,10 @@ add_custom_command(
 	OUTPUT
 		${CMAKE_CURRENT_BINARY_DIR}/${MAN_PAGE_NAME}
 	COMMAND
-		bash -c "pandoc \"${CMAKE_CURRENT_SOURCE_DIR}/patchelfcrc.1.md\" -s -t man | gzip > \"${CMAKE_CURRENT_BINARY_DIR}/${MAN_PAGE_NAME}\""
+		bash -c "cat \"${CMAKE_CURRENT_SOURCE_DIR}/patchelfcrc.1.md\" | sed \"s/!version!/`git describe --tags --always --dirty`/\" | pandoc  -s -t man | gzip > \"${CMAKE_CURRENT_BINARY_DIR}/${MAN_PAGE_NAME}\""
 	VERBATIM
 	WORKING_DIRECTORY
-		${CMAKE_CURRENT_BINARY_DIR}
+		${CMAKE_CURRENT_SOURCE_DIR}
 	MAIN_DEPENDENCY
 		${CMAKE_CURRENT_SOURCE_DIR}/patchelfcrc.1.md
 )

man/patchelfcrc.1.md

@@ -1,4 +1,4 @@
-% patchelfcrc(1) 0.0.2
+% patchelfcrc(1) !version!
 % Mario Huettel
 % October 2022
 
@@ -84,6 +84,9 @@
 **--usage**
 : Print usage hints on command line options.
 
+**--no-color**
+: Force output on stdout and stderr to be pure text without color codes.
+
 # EXAMPLES
 
 **patchelfcrc** --list-crcs

src/elfpatch.c

@@ -30,6 +30,19 @@
 #include <fort.h>
 #include <inttypes.h>
 #include <patchelfcrc/crc-output-struct.h>
+#include <byteswap.h>
+
+static const union  {
+	uint8_t data[4];
+	uint32_t val;
+} _endianess_check_union = {{1u, 2u, 3u, 4u}};
+
+enum endianess {
+	END_LITTLE = 0x04030201ul,
+	END_BIG = 0x01020304ul,
+};
+
+#define HOST_ENDIANESS (_endianess_check_union.val)
 
 struct elf_section {
 	GElf_Shdr section_header;
@@ -77,15 +90,16 @@ static uint32_t get_uint32_from_byte_string(const uint8_t *data, bool little_end
 	uint32_t out = 0ul;
 	int i;
 
+	/* Always shift in in big endian format */
 	for (i = 0; i < 4; i++) {
-		if (little_endian)
-			out >>= 8u;
-		else
 			out <<= 8u;
-
+		out |= (uint32_t)data[i];
-		out |= (((uint32_t)data[i]) << (little_endian ? 24u : 0u));
 	}
 
+	/* Swap bytes if little endian */
+	if (little_endian)
+		out = bswap_32(out);
+
 	return out;
 }
 
@@ -96,14 +110,12 @@ static void write_crc_to_byte_array(uint8_t *byte_array, uint32_t crc, uint8_t c
 	if (!byte_array)
 		return;
 
+	if (!little_endian)
+		crc = bswap_32(crc);
+
 	for (i = 0; i < crc_size_bytes; i++) {
-		if (little_endian) {
+		byte_array[i] = (uint8_t)(crc & 0xFFul);
-			byte_array[i] = (uint8_t)(crc & 0xFFul);
+		crc >>= 8u;
-			crc >>= 8u;
-		} else {
-			byte_array[i] = (uint8_t)((crc & 0xFF000000ul) >> 24u);
-			crc <<= 8u;
-		}
 	}
 }
 
@@ -136,6 +148,14 @@ static const char *section_type_to_str(Elf64_Word type)
 		return "INIT_ARRAY";
 	case SHT_FINI_ARRAY:
 		return "FINI_ARRAY";
+	case SHT_PREINIT_ARRAY:
+		return "PREINIT_ARRAY";
+	case SHT_DYNAMIC:
+		return "DYNAMIC";
+	case SHT_ARM_ATTRIBUTES:
+		return "ARM_ATTRIBUTES";
+	case SHT_ARM_PREEMPTMAP:
+		return "ARM_PREEMPTMAP";
 	default:
 		break;
 	}
@@ -147,6 +167,7 @@ static void print_sections(elfpatch_handle_t *ep)
 	SlList *iter;
 	ft_table_t *table;
 	const struct elf_section *section;
+	bool alloc, write, exec;
 
 	ret_if_ep_err(ep);
 
@@ -162,15 +183,23 @@ static void print_sections(elfpatch_handle_t *ep)
 
 	/* Write header */
 	ft_set_cell_prop(table, 0, FT_ANY_COLUMN, FT_CPROP_ROW_TYPE, FT_ROW_HEADER);
-	ft_write_ln(table, "Section", "Type", "Size", "VMA", "LMA", "File Offset");
+	ft_write_ln(table, "Section", "Type", "ALLOC", "WRITE", "EXEC", "Size", "VMA", "LMA", "File Offset");
 
 	for (iter = ep->sections; iter; iter = sl_list_next(iter)) {
 		section = (const struct elf_section *)iter->data;
 		if (!section)
 			continue;
-		ft_printf_ln(table, "%s|%s|%lu|%p|%p|%p",
+
+		alloc = !!(section->section_header.sh_flags & SHF_ALLOC);
+		write = !!(section->section_header.sh_flags & SHF_WRITE);
+		exec = !!(section->section_header.sh_flags & SHF_EXECINSTR);
+
+		ft_printf_ln(table, "%s|%s|%s|%s|%s|%lu|%p|%p|%p",
 			     section->name,
 			     section_type_to_str(section->section_header.sh_type),
+			     alloc ? "x" : "",
+			     write ? "x" : "",
+			     exec ? "x" : "",
 			     section->section_header.sh_size,
 			     (void *)section->section_header.sh_addr,
 			     (void *)section->lma,
@@ -261,6 +290,12 @@ static int elf_patch_read_program_headers(elfpatch_handle_t *ep)
 		return -1;
 	}
 
+	if (header_count == 0) {
+		/* No program headers found. This ELF file is probably not linked */
+		ep->program_headers_count = 0;
+		return 0;
+	}
+
 	ep->program_headers = (GElf_Phdr *)malloc(header_count * sizeof(GElf_Phdr));
 	if (!ep->program_headers) {
 		/* Mem error. Abort. Program will crash eventually */
@@ -306,9 +341,11 @@ static void resolve_section_lmas(elfpatch_handle_t *ep)
 		if (!sec)
 			continue;
 
+		/* By default each sections LMA is assumed to be its LMA as well */
+		sec->lma = (uint64_t)sec->section_header.sh_addr;
+
 		if (sec->section_header.sh_type == SHT_NOBITS) {
 			/* Section does not contain data. It may be allocated but is not loaded. Therefore, LMA=VMA. */
-			sec->lma = (uint64_t)sec->section_header.sh_addr;
 			continue;
 		}
 
@@ -433,12 +470,12 @@ elfpatch_handle_t *elf_patch_open(const char *path, bool readonly, bool expect_l
 		case 1:
 			print_debug("ELF Endianess: little\n");
 			if (!expect_little_endian)
-				print_err("Big endian format expected. File is little endian. Double check settings!\n");
+				print_warn("Big endian format expected. File is little endian. Double check settings!\n");
 			break;
 		case 2:
 			print_debug("ELF Endianess: big\n");
 			if (expect_little_endian)
-				print_err("Little endian format expected. File is big endian. Double check settings!\n");
+				print_warn("Little endian format expected. File is big endian. Double check settings!\n");
 			break;
 		default:
 			print_err("Cannot determine endianess of ELF file. EI_DATA is: %d\n", ident[5]);
@@ -651,6 +688,7 @@ int elf_patch_write_crcs_to_section(elfpatch_handle_t *ep, const char *output_se
 	struct crc_out_struct_32bit crc_32bit;
 	struct crc_out_struct_64bit crc_64bit;
 	uint64_t in_sec_addr, in_sec_len;
+	bool needs_byteswap;
 
 	ret_val_if_ep_err(ep, -1000);
 
@@ -748,6 +786,12 @@ int elf_patch_write_crcs_to_section(elfpatch_handle_t *ep, const char *output_se
 		if (check_start_magic && crc_data->elf_bits == 64)
 			sec_bytes += 4u;
 
+		needs_byteswap = false;
+		if ((HOST_ENDIANESS != END_LITTLE && little_endian) ||
+				(HOST_ENDIANESS == END_LITTLE && !little_endian)) {
+			needs_byteswap = true;
+		}
+
 		for (iter = crc_data->crc_entries, idx = 0; iter; iter = sl_list_next(iter), idx++) {
 			crc_entry = (struct crc_entry *)iter->data;
 			in_sec_addr = use_vma ? crc_entry->vma : crc_entry->lma;
@@ -758,18 +802,19 @@ int elf_patch_write_crcs_to_section(elfpatch_handle_t *ep, const char *output_se
 			print_debug("Corresponding input section at 0x%"PRIx64", length: %"PRIu64"\n",
 				    in_sec_addr,
 				    in_sec_len);
+
 			if (crc_data->elf_bits == 32) {
-				crc_32bit.crc = crc_entry->crc;
+				crc_32bit.crc = needs_byteswap ? bswap_32(crc_entry->crc) : crc_entry->crc;
-				crc_32bit.length = (uint32_t)in_sec_len;
+				crc_32bit.length = needs_byteswap ? bswap_32((uint32_t)in_sec_len) : (uint32_t)in_sec_len;
-				crc_32bit.start_address = (uint32_t)in_sec_addr;
+				crc_32bit.start_address = needs_byteswap ? bswap_32((uint32_t)in_sec_addr) : (uint32_t)in_sec_addr;
 				memcpy(sec_bytes, &crc_32bit, sizeof(crc_32bit));
 				sec_bytes += sizeof(crc_32bit);
 			} else {
 				/* 64 bit case */
-				crc_64bit.crc = crc_entry->crc;
+				crc_64bit.crc = needs_byteswap ? bswap_32(crc_entry->crc) : crc_entry->crc;
 				crc_64bit._unused_dummy = 0ul;
-				crc_64bit.length = in_sec_len;
+				crc_64bit.length = needs_byteswap ? bswap_64(in_sec_len) : in_sec_len;
-				crc_64bit.start_address = in_sec_addr;
+				crc_64bit.start_address = needs_byteswap ? bswap_64(in_sec_addr) : in_sec_addr;
 				memcpy(sec_bytes, &crc_64bit, sizeof(crc_64bit));
 				sec_bytes += sizeof(crc_64bit);
 			}

src/main.c

@@ -40,8 +40,10 @@ const char *argp_program_bug_address = "<mario [dot] huettel [at] linux [dot] co
 #define ARG_KEY_IMPORT (6)
 #define ARG_KEY_USE_VMA (7)
 #define ARG_KEY_XSD (8)
+#define ARG_KEY_FORCE_NO_COLOR (9)
 
 struct command_line_options {
+	bool force_nocolor;
 	bool little_endian;
 	bool dry_run;
 	bool verbose;
@@ -104,6 +106,9 @@ static error_t parse_opt(int key, char *arg, struct argp_state *state)
 	case ARG_KEY_USE_VMA:
 		args->use_vma = true;
 		break;
+	case ARG_KEY_FORCE_NO_COLOR:
+		args->force_nocolor = true;
+		break;
 	case 'p':
 		/* Polyniomial */
 		args->crc.polynomial = strtoull(arg, &endptr, 0);
@@ -195,6 +200,7 @@ static int parse_cmdline_options(int *argc, char ***argv, struct command_line_op
 		{"import", ARG_KEY_IMPORT, "XML", 0, "Do not caclulate CRCs but import them from file", 3},
 		{"xsd", ARG_KEY_XSD, 0, 0, "Print XSD to stdout", 0},
 		{"use-vma", ARG_KEY_USE_VMA, 0, 0, "Use the VMA instead of the LMA for struct output", 2},
+		{"no-color", ARG_KEY_FORCE_NO_COLOR, 0, 0, "Force the output to be text only without colors", 0},
 		/* Sentinel */
 		{NULL, 0, 0, 0, NULL, 0}
 	};
@@ -425,8 +431,11 @@ int main(int argc, char **argv)
 		goto free_cmds;
 	}
 
+	/* Initialize console output */
+	reporting_init(cmd_opts.force_nocolor ? COLOR_MODE_COLOR_OFF : COLOR_MODE_DETECT);
+
 	if (cmd_opts.verbose || cmd_opts.dry_run)
-		reporting_enable_verbose();
+		reporting_enable_verbose(true);
 
 	print_verbose_start_info(&cmd_opts);
 
@@ -450,7 +459,7 @@ int main(int argc, char **argv)
 		print_warn("--use-vma option only has an effect when exporting as struct output.\n");
 
 	if (!cmd_opts.output_section && cmd_opts.export_xml == NULL)
-		print_err("No output section / XML export specified. Will continue but not create any output\n");
+		print_warn("No output section / XML export specified. Will continue but not create any output\n");
 
 	/* Prepare libelf for use with the latest ELF version */
 	elf_version(EV_CURRENT);

src/reporting.c

@@ -19,9 +19,66 @@
 #include <patchelfcrc/reporting.h>
 #include <stdarg.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <stdbool.h>
+#include <string.h>
+#include <unistd.h>
 
 static bool global_verbosity_state = false;
+static bool reporting_use_color = false;
+
+#define COLOR_RESET "\e[0m"
+
+#define COLOR_BOLD_RED "\e[31;1m"
+#define COLOR_RED "\e[31m"
+
+#define COLOR_BOLD_YELLOW "\e[33;1m"
+#define COLOR_YELLOW "\e[33m"
+
+
+void print_err(const char *fmt, ...)
+{
+	va_list va;
+	va_start(va, fmt);
+
+	/* Set color */
+	if (reporting_use_color)
+		fprintf(stderr, COLOR_BOLD_RED "[ERR]" COLOR_RESET " " COLOR_RED);
+	else
+		fprintf(stderr, "[ERR] ");
+
+
+	vfprintf(stderr, fmt, va);
+
+	/* Reset color */
+	if (reporting_use_color) {
+		fprintf(stderr, COLOR_RESET);
+	}
+
+	va_end(va);
+}
+
+void print_warn(const char *fmt, ...)
+{
+	va_list va;
+	va_start(va, fmt);
+
+	/* Set color */
+	if (reporting_use_color)
+		fprintf(stderr, COLOR_BOLD_YELLOW "[WARN]" COLOR_RESET " " COLOR_YELLOW);
+	else
+		fprintf(stderr, "[WARN] ");
+
+
+	vfprintf(stderr, fmt, va);
+
+	/* Reset color */
+	if (reporting_use_color) {
+		fprintf(stderr, COLOR_RESET);
+	}
+
+	va_end(va);
+}
 
 void print_debug(const char *fmt, ...)
 {
@@ -34,12 +91,52 @@ void print_debug(const char *fmt, ...)
 	}
 }
 
-void reporting_enable_verbose(void)
+void reporting_enable_verbose(bool state)
 {
-	global_verbosity_state = true;
+	global_verbosity_state = state;
 }
 
 bool reporting_get_verbosity(void)
 {
 	return global_verbosity_state;
 }
+
+/**
+ * @brief Check whether stderr supports colors.
+ * @note This function checks for a tty and the TERM environment variable. It has to contain "xterm".
+ * @return true if colors are supported
+ * @return false if no colors should be used
+ */
+static bool stderr_supports_colors(void)
+{
+	const char *env_var;
+	const char *tmp;
+
+	if (isatty(2) != 1)
+		return false;
+
+	env_var = getenv("TERM");
+	if (!env_var)
+		return false;
+
+	tmp = strstr(env_var, "xterm");
+	if (!tmp)
+		return false;
+
+	return true;
+}
+
+void reporting_init(enum reporting_color_mode mode)
+{
+	switch (mode) {
+	case COLOR_MODE_COLOR:
+		reporting_use_color = true;
+		break;
+	case COLOR_MODE_COLOR_OFF:
+		reporting_use_color = false;
+		break;
+	default: /* Auto detect case and invalid settings */
+		reporting_use_color = stderr_supports_colors();
+		break;
+	}
+}