Initial commit

Makefile

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+DESTDIR=/usr/local/
+BINDIR=bin
+
+PROG=	elfdbg
+SRCS=	elfdbg.c
+
+CFLAGS+=-lelf
+
+.include <bsd.prog.mk>

README.md

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+# elfdbg

elfdbg.1

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+.\" Copyright (c) 2015 Sofian Brabez <sbz@FreeBSD.org>
+.\" 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.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+.\"
+.Dd January 20, 2015
+.Dt ELFDBG 1
+.Os
+.Sh NAME
+.Nm elfdbg
+.Nd analyze if binary is compiled with debug sections
+.Sh SYNOPSIS
+.Nm
+.Op Ar file
+.Sh DESCRIPTION
+The
+.Nm
+utility reports if a binary is compiled with debug sections, commonly
+known as 
+.Ar -g 
+compiler toolchain flag.
+.Sh SEE ALSO
+.Xr libelf 3 ,
+.Sh AUTHORS
+.An -nosplit
+The
+.Nm
+program was written by
+.An Sofian Brabez Aq Mt sbz@FreeBSD.org .

elfdbg.c

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+/*-
+ * Copyright (c) 2015 Sofian Brabez <sbz@FreeBSD.org>
+ * 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
+ *    in this position and unchanged.
+ * 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.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``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 AUTHOR(S) 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 <err.h>
+#include <fcntl.h>
+#include <gelf.h>
+#include <stdint.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sysexits.h>
+#include <unistd.h>
+
+static int
+elf_debug_sections(Elf *e) {
+        Elf_Scn *scn=NULL;
+        GElf_Shdr shdr;
+        size_t n, shstrndx, sz;
+        char *name;
+        int has_debug=0;
+
+        if (elf_getshdrstrndx(e, &shstrndx) != 0)
+                errx(EX_SOFTWARE, "elf_getshdrstrndx() failed : %s . " , elf_errmsg(-1));
+
+        while ((scn = elf_nextscn(e, scn)) != NULL) {
+                gelf_getshdr(scn, &shdr);
+
+                name = elf_strptr(e, shstrndx, shdr.sh_name);
+                if (!strstr(name, "debug_"))
+                    continue;
+
+                has_debug++;
+
+        }
+
+        return (has_debug > 0);
+}
+
+int main(int argc, char *argv[]) {
+        int fd, rc;
+        Elf *e;
+        int has_debug;
+
+        if (elf_version(EV_CURRENT) == EV_NONE )
+                errx(EX_SOFTWARE, "ELF library initialization failed : %s ", elf_errmsg(-1));
+
+        if ((fd =open(argv [1], O_RDONLY , 0)) < 0)
+                err(EX_NOINPUT,"open %s failed ", argv [1]);
+        if ((e = elf_begin(fd, ELF_C_READ , NULL)) == NULL)
+                errx(EX_SOFTWARE, "elf_begin () failed : %s . ", elf_errmsg(-1));
+        if (elf_kind(e) != ELF_K_ELF)
+                errx(EX_DATAERR, "%s is not an ELF object . ", argv[1]);
+
+        has_debug=elf_debug_sections(e);
+        printf(has_debug ? "HAS DEBUG\n" : "NO DEBUG\n");
+
+	rc=close(fd);
+	rc=elf_end(e);
+
+	return (rc);
+}