548 lines
12 KiB
C
548 lines
12 KiB
C
// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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/* Copyright (C) 2017-2018 Netronome Systems, Inc. */
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#include <ctype.h>
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#include <errno.h>
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#include <getopt.h>
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#include <linux/bpf.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <bpf/bpf.h>
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#include <bpf/btf.h>
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#include <bpf/hashmap.h>
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#include <bpf/libbpf.h>
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#include "main.h"
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#define BATCH_LINE_LEN_MAX 65536
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#define BATCH_ARG_NB_MAX 4096
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const char *bin_name;
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static int last_argc;
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static char **last_argv;
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static int (*last_do_help)(int argc, char **argv);
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json_writer_t *json_wtr;
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bool pretty_output;
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bool json_output;
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bool show_pinned;
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bool block_mount;
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bool verifier_logs;
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bool relaxed_maps;
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bool use_loader;
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struct btf *base_btf;
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struct hashmap *refs_table;
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static void __noreturn clean_and_exit(int i)
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{
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if (json_output)
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jsonw_destroy(&json_wtr);
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exit(i);
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}
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void usage(void)
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{
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last_do_help(last_argc - 1, last_argv + 1);
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clean_and_exit(-1);
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}
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static int do_help(int argc, char **argv)
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{
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if (json_output) {
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jsonw_null(json_wtr);
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return 0;
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}
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fprintf(stderr,
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"Usage: %s [OPTIONS] OBJECT { COMMAND | help }\n"
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" %s batch file FILE\n"
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" %s version\n"
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"\n"
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" OBJECT := { prog | map | link | cgroup | perf | net | feature | btf | gen | struct_ops | iter }\n"
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" " HELP_SPEC_OPTIONS " |\n"
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" {-V|--version} }\n"
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"",
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bin_name, bin_name, bin_name);
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return 0;
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}
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static int do_batch(int argc, char **argv);
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static int do_version(int argc, char **argv);
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static const struct cmd commands[] = {
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{ "help", do_help },
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{ "batch", do_batch },
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{ "prog", do_prog },
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{ "map", do_map },
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{ "link", do_link },
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{ "cgroup", do_cgroup },
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{ "perf", do_perf },
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{ "net", do_net },
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{ "feature", do_feature },
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{ "btf", do_btf },
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{ "gen", do_gen },
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{ "struct_ops", do_struct_ops },
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{ "iter", do_iter },
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{ "version", do_version },
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{ 0 }
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};
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#ifndef BPFTOOL_VERSION
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/* bpftool's major and minor version numbers are aligned on libbpf's. There is
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* an offset of 6 for the version number, because bpftool's version was higher
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* than libbpf's when we adopted this scheme. The patch number remains at 0
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* for now. Set BPFTOOL_VERSION to override.
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*/
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#define BPFTOOL_MAJOR_VERSION (LIBBPF_MAJOR_VERSION + 6)
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#define BPFTOOL_MINOR_VERSION LIBBPF_MINOR_VERSION
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#define BPFTOOL_PATCH_VERSION 0
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#endif
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static void
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print_feature(const char *feature, bool state, unsigned int *nb_features)
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{
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if (state) {
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printf("%s %s", *nb_features ? "," : "", feature);
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*nb_features = *nb_features + 1;
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}
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}
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static int do_version(int argc, char **argv)
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{
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#ifdef HAVE_LIBBFD_SUPPORT
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const bool has_libbfd = true;
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#else
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const bool has_libbfd = false;
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#endif
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#ifdef HAVE_LLVM_SUPPORT
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const bool has_llvm = true;
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#else
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const bool has_llvm = false;
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#endif
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#ifdef BPFTOOL_WITHOUT_SKELETONS
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const bool has_skeletons = false;
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#else
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const bool has_skeletons = true;
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#endif
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bool bootstrap = false;
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int i;
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for (i = 0; commands[i].cmd; i++) {
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if (!strcmp(commands[i].cmd, "prog")) {
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/* Assume we run a bootstrap version if "bpftool prog"
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* is not available.
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*/
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bootstrap = !commands[i].func;
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break;
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}
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}
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if (json_output) {
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jsonw_start_object(json_wtr); /* root object */
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jsonw_name(json_wtr, "version");
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#ifdef BPFTOOL_VERSION
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jsonw_printf(json_wtr, "\"%s\"", BPFTOOL_VERSION);
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#else
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jsonw_printf(json_wtr, "\"%d.%d.%d\"", BPFTOOL_MAJOR_VERSION,
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BPFTOOL_MINOR_VERSION, BPFTOOL_PATCH_VERSION);
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#endif
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jsonw_name(json_wtr, "libbpf_version");
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jsonw_printf(json_wtr, "\"%d.%d\"",
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libbpf_major_version(), libbpf_minor_version());
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jsonw_name(json_wtr, "features");
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jsonw_start_object(json_wtr); /* features */
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jsonw_bool_field(json_wtr, "libbfd", has_libbfd);
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jsonw_bool_field(json_wtr, "llvm", has_llvm);
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jsonw_bool_field(json_wtr, "skeletons", has_skeletons);
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jsonw_bool_field(json_wtr, "bootstrap", bootstrap);
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jsonw_end_object(json_wtr); /* features */
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jsonw_end_object(json_wtr); /* root object */
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} else {
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unsigned int nb_features = 0;
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#ifdef BPFTOOL_VERSION
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printf("%s v%s\n", bin_name, BPFTOOL_VERSION);
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#else
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printf("%s v%d.%d.%d\n", bin_name, BPFTOOL_MAJOR_VERSION,
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BPFTOOL_MINOR_VERSION, BPFTOOL_PATCH_VERSION);
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#endif
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printf("using libbpf %s\n", libbpf_version_string());
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printf("features:");
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print_feature("libbfd", has_libbfd, &nb_features);
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print_feature("llvm", has_llvm, &nb_features);
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print_feature("skeletons", has_skeletons, &nb_features);
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print_feature("bootstrap", bootstrap, &nb_features);
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printf("\n");
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}
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return 0;
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}
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int cmd_select(const struct cmd *cmds, int argc, char **argv,
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int (*help)(int argc, char **argv))
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{
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unsigned int i;
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last_argc = argc;
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last_argv = argv;
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last_do_help = help;
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if (argc < 1 && cmds[0].func)
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return cmds[0].func(argc, argv);
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for (i = 0; cmds[i].cmd; i++) {
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if (is_prefix(*argv, cmds[i].cmd)) {
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if (!cmds[i].func) {
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p_err("command '%s' is not supported in bootstrap mode",
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cmds[i].cmd);
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return -1;
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}
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return cmds[i].func(argc - 1, argv + 1);
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}
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}
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help(argc - 1, argv + 1);
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return -1;
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}
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bool is_prefix(const char *pfx, const char *str)
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{
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if (!pfx)
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return false;
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if (strlen(str) < strlen(pfx))
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return false;
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return !memcmp(str, pfx, strlen(pfx));
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}
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/* Last argument MUST be NULL pointer */
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int detect_common_prefix(const char *arg, ...)
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{
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unsigned int count = 0;
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const char *ref;
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char msg[256];
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va_list ap;
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snprintf(msg, sizeof(msg), "ambiguous prefix: '%s' could be '", arg);
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va_start(ap, arg);
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while ((ref = va_arg(ap, const char *))) {
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if (!is_prefix(arg, ref))
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continue;
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count++;
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if (count > 1)
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strncat(msg, "' or '", sizeof(msg) - strlen(msg) - 1);
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strncat(msg, ref, sizeof(msg) - strlen(msg) - 1);
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}
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va_end(ap);
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strncat(msg, "'", sizeof(msg) - strlen(msg) - 1);
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if (count >= 2) {
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p_err("%s", msg);
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return -1;
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}
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return 0;
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}
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void fprint_hex(FILE *f, void *arg, unsigned int n, const char *sep)
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{
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unsigned char *data = arg;
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unsigned int i;
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for (i = 0; i < n; i++) {
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const char *pfx = "";
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if (!i)
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/* nothing */;
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else if (!(i % 16))
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fprintf(f, "\n");
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else if (!(i % 8))
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fprintf(f, " ");
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else
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pfx = sep;
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fprintf(f, "%s%02hhx", i ? pfx : "", data[i]);
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}
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}
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/* Split command line into argument vector. */
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static int make_args(char *line, char *n_argv[], int maxargs, int cmd_nb)
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{
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static const char ws[] = " \t\r\n";
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char *cp = line;
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int n_argc = 0;
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while (*cp) {
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/* Skip leading whitespace. */
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cp += strspn(cp, ws);
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if (*cp == '\0')
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break;
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if (n_argc >= (maxargs - 1)) {
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p_err("too many arguments to command %d", cmd_nb);
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return -1;
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}
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/* Word begins with quote. */
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if (*cp == '\'' || *cp == '"') {
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char quote = *cp++;
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n_argv[n_argc++] = cp;
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/* Find ending quote. */
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cp = strchr(cp, quote);
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if (!cp) {
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p_err("unterminated quoted string in command %d",
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cmd_nb);
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return -1;
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}
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} else {
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n_argv[n_argc++] = cp;
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/* Find end of word. */
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cp += strcspn(cp, ws);
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if (*cp == '\0')
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break;
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}
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/* Separate words. */
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*cp++ = 0;
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}
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n_argv[n_argc] = NULL;
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return n_argc;
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}
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static int do_batch(int argc, char **argv)
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{
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char buf[BATCH_LINE_LEN_MAX], contline[BATCH_LINE_LEN_MAX];
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char *n_argv[BATCH_ARG_NB_MAX];
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unsigned int lines = 0;
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int n_argc;
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FILE *fp;
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char *cp;
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int err = 0;
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int i;
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if (argc < 2) {
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p_err("too few parameters for batch");
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return -1;
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} else if (argc > 2) {
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p_err("too many parameters for batch");
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return -1;
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} else if (!is_prefix(*argv, "file")) {
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p_err("expected 'file', got: %s", *argv);
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return -1;
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}
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NEXT_ARG();
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if (!strcmp(*argv, "-"))
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fp = stdin;
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else
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fp = fopen(*argv, "r");
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if (!fp) {
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p_err("Can't open file (%s): %s", *argv, strerror(errno));
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return -1;
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}
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if (json_output)
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jsonw_start_array(json_wtr);
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while (fgets(buf, sizeof(buf), fp)) {
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cp = strchr(buf, '#');
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if (cp)
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*cp = '\0';
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if (strlen(buf) == sizeof(buf) - 1) {
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errno = E2BIG;
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break;
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}
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/* Append continuation lines if any (coming after a line ending
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* with '\' in the batch file).
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*/
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while ((cp = strstr(buf, "\\\n")) != NULL) {
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if (!fgets(contline, sizeof(contline), fp) ||
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strlen(contline) == 0) {
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p_err("missing continuation line on command %d",
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lines);
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err = -1;
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goto err_close;
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}
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cp = strchr(contline, '#');
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if (cp)
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*cp = '\0';
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if (strlen(buf) + strlen(contline) + 1 > sizeof(buf)) {
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p_err("command %d is too long", lines);
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err = -1;
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goto err_close;
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}
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buf[strlen(buf) - 2] = '\0';
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strcat(buf, contline);
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}
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n_argc = make_args(buf, n_argv, BATCH_ARG_NB_MAX, lines);
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if (!n_argc)
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continue;
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if (n_argc < 0) {
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err = n_argc;
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goto err_close;
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}
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if (json_output) {
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jsonw_start_object(json_wtr);
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jsonw_name(json_wtr, "command");
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jsonw_start_array(json_wtr);
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for (i = 0; i < n_argc; i++)
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jsonw_string(json_wtr, n_argv[i]);
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jsonw_end_array(json_wtr);
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jsonw_name(json_wtr, "output");
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}
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err = cmd_select(commands, n_argc, n_argv, do_help);
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if (json_output)
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jsonw_end_object(json_wtr);
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if (err)
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goto err_close;
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lines++;
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}
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if (errno && errno != ENOENT) {
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p_err("reading batch file failed: %s", strerror(errno));
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err = -1;
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} else {
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if (!json_output)
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printf("processed %d commands\n", lines);
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}
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err_close:
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if (fp != stdin)
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fclose(fp);
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if (json_output)
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jsonw_end_array(json_wtr);
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return err;
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}
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int main(int argc, char **argv)
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{
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static const struct option options[] = {
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{ "json", no_argument, NULL, 'j' },
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{ "help", no_argument, NULL, 'h' },
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{ "pretty", no_argument, NULL, 'p' },
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{ "version", no_argument, NULL, 'V' },
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{ "bpffs", no_argument, NULL, 'f' },
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{ "mapcompat", no_argument, NULL, 'm' },
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{ "nomount", no_argument, NULL, 'n' },
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{ "debug", no_argument, NULL, 'd' },
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{ "use-loader", no_argument, NULL, 'L' },
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{ "base-btf", required_argument, NULL, 'B' },
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{ 0 }
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};
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bool version_requested = false;
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int opt, ret;
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setlinebuf(stdout);
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#ifdef USE_LIBCAP
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/* Libcap < 2.63 hooks before main() to compute the number of
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* capabilities of the running kernel, and doing so it calls prctl()
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* which may fail and set errno to non-zero.
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* Let's reset errno to make sure this does not interfere with the
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* batch mode.
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*/
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errno = 0;
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#endif
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last_do_help = do_help;
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pretty_output = false;
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json_output = false;
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show_pinned = false;
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block_mount = false;
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bin_name = "bpftool";
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opterr = 0;
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while ((opt = getopt_long(argc, argv, "VhpjfLmndB:l",
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options, NULL)) >= 0) {
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switch (opt) {
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case 'V':
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version_requested = true;
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break;
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case 'h':
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return do_help(argc, argv);
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case 'p':
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pretty_output = true;
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/* fall through */
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case 'j':
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if (!json_output) {
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json_wtr = jsonw_new(stdout);
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if (!json_wtr) {
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p_err("failed to create JSON writer");
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return -1;
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}
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json_output = true;
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}
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jsonw_pretty(json_wtr, pretty_output);
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break;
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case 'f':
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show_pinned = true;
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break;
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case 'm':
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relaxed_maps = true;
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break;
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case 'n':
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block_mount = true;
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break;
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case 'd':
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libbpf_set_print(print_all_levels);
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verifier_logs = true;
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break;
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case 'B':
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base_btf = btf__parse(optarg, NULL);
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if (!base_btf) {
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p_err("failed to parse base BTF at '%s': %d\n",
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optarg, -errno);
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return -1;
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}
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break;
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case 'L':
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use_loader = true;
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break;
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default:
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p_err("unrecognized option '%s'", argv[optind - 1]);
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if (json_output)
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clean_and_exit(-1);
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else
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if (argc < 0)
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usage();
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if (version_requested)
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return do_version(argc, argv);
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ret = cmd_select(commands, argc, argv, do_help);
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if (json_output)
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jsonw_destroy(&json_wtr);
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btf__free(base_btf);
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return ret;
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}
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