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539 lines
11 KiB
539 lines
11 KiB
// 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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bool legacy_libbpf; |
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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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#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 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 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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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, "libbpf_strict", !legacy_libbpf); |
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jsonw_bool_field(json_wtr, "skeletons", has_skeletons); |
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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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if (has_libbfd) { |
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printf(" libbfd"); |
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nb_features++; |
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} |
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if (!legacy_libbpf) { |
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printf("%s libbpf_strict", nb_features++ ? "," : ""); |
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nb_features++; |
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} |
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if (has_skeletons) |
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printf("%s skeletons", 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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static const struct cmd cmds[] = { |
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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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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 (!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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} 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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} |
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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(cmds, 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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{ "legacy", no_argument, NULL, 'l' }, |
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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 = argv[0]; |
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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 (libbpf_get_error(base_btf)) { |
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p_err("failed to parse base BTF at '%s': %ld\n", |
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optarg, libbpf_get_error(base_btf)); |
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base_btf = NULL; |
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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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case 'l': |
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legacy_libbpf = 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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if (!legacy_libbpf) { |
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/* Allow legacy map definitions for skeleton generation. |
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* It will still be rejected if users use LIBBPF_STRICT_ALL |
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* mode for loading generated skeleton. |
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*/ |
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libbpf_set_strict_mode(LIBBPF_STRICT_ALL & ~LIBBPF_STRICT_MAP_DEFINITIONS); |
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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(cmds, 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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