Messages in this thread Patch in this message | | | From | Wang Nan <> | Subject | [RFC PATCH v2 10/37] tools lib bpf: iterater over elf sections to collect information. | Date | Fri, 15 May 2015 07:51:03 +0000 |
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bpf_obj_elf_collect() is introduced to iterate over each elf sections to collection informations in eBPF object files. This function will futher enhanced to collect license, kernel version, programs, configs and map information.
Signed-off-by: Wang Nan <wangnan0@huawei.com> --- tools/lib/bpf/libbpf.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+)
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index a4910a8..1af80c3 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -206,6 +206,58 @@ bpf_obj_swap_init(struct bpf_object *obj) } } +static int bpf_obj_elf_collect(struct bpf_object *obj) +{ + Elf *elf = obj->elf.elf; + GElf_Ehdr *ep = &obj->elf.ehdr; + Elf_Scn *scn = NULL; + int idx = 0, err = 0; + + /* Elf is corrupted/truncated, avoid calling elf_strptr. */ + if (!elf_rawdata(elf_getscn(elf, ep->e_shstrndx), NULL)) { + pr_warning("failed to get e_shstrndx from %s\n", + obj->path); + return -EINVAL; + } + + while ((scn = elf_nextscn(elf, scn)) != NULL) { + char *name; + GElf_Shdr sh; + Elf_Data *data; + + idx++; + if (gelf_getshdr(scn, &sh) != &sh) { + pr_warning("failed to get section header" + " from %s\n", obj->path); + err = -EINVAL; + goto out; + } + + name = elf_strptr(elf, ep->e_shstrndx, sh.sh_name); + if (!name) { + pr_warning("failed to get section name " + "from %s\n", obj->path); + err = -EINVAL; + goto out; + } + + data = elf_getdata(scn, 0); + if (!data) { + pr_warning("failed to get section data " + "from %s(%s)\n", name, obj->path); + err = -EINVAL; + goto out; + } + pr_debug("section %s, size %ld, link %d, " + "flags %lx, type=%d\n", + name, (unsigned long)data->d_size, + (int)sh.sh_link, (unsigned long)sh.sh_flags, + (int)sh.sh_type); + } +out: + return err; +} + struct bpf_object *bpf_open_object(const char *path) { struct bpf_object *obj; @@ -229,6 +281,8 @@ struct bpf_object *bpf_open_object(const char *path) goto out; if (bpf_obj_swap_init(obj)) goto out; + if (bpf_obj_elf_collect(obj)) + goto out; return obj; -- 1.8.3.4
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