1
2
3
4#include <ctype.h>
5#include <errno.h>
6#include <getopt.h>
7#include <linux/bpf.h>
8#include <stdio.h>
9#include <stdlib.h>
10#include <string.h>
11
12#include <bpf.h>
13
14#include "main.h"
15
16#define BATCH_LINE_LEN_MAX 65536
17#define BATCH_ARG_NB_MAX 4096
18
19const char *bin_name;
20static int last_argc;
21static char **last_argv;
22static int (*last_do_help)(int argc, char **argv);
23json_writer_t *json_wtr;
24bool pretty_output;
25bool json_output;
26bool show_pinned;
27bool block_mount;
28int bpf_flags;
29struct pinned_obj_table prog_table;
30struct pinned_obj_table map_table;
31
32static void __noreturn clean_and_exit(int i)
33{
34 if (json_output)
35 jsonw_destroy(&json_wtr);
36
37 exit(i);
38}
39
40void usage(void)
41{
42 last_do_help(last_argc - 1, last_argv + 1);
43
44 clean_and_exit(-1);
45}
46
47static int do_help(int argc, char **argv)
48{
49 if (json_output) {
50 jsonw_null(json_wtr);
51 return 0;
52 }
53
54 fprintf(stderr,
55 "Usage: %s [OPTIONS] OBJECT { COMMAND | help }\n"
56 " %s batch file FILE\n"
57 " %s version\n"
58 "\n"
59 " OBJECT := { prog | map | cgroup | perf | net | feature }\n"
60 " " HELP_SPEC_OPTIONS "\n"
61 "",
62 bin_name, bin_name, bin_name);
63
64 return 0;
65}
66
67static int do_version(int argc, char **argv)
68{
69 if (json_output) {
70 jsonw_start_object(json_wtr);
71 jsonw_name(json_wtr, "version");
72 jsonw_printf(json_wtr, "\"%s\"", BPFTOOL_VERSION);
73 jsonw_end_object(json_wtr);
74 } else {
75 printf("%s v%s\n", bin_name, BPFTOOL_VERSION);
76 }
77 return 0;
78}
79
80int cmd_select(const struct cmd *cmds, int argc, char **argv,
81 int (*help)(int argc, char **argv))
82{
83 unsigned int i;
84
85 last_argc = argc;
86 last_argv = argv;
87 last_do_help = help;
88
89 if (argc < 1 && cmds[0].func)
90 return cmds[0].func(argc, argv);
91
92 for (i = 0; cmds[i].func; i++)
93 if (is_prefix(*argv, cmds[i].cmd))
94 return cmds[i].func(argc - 1, argv + 1);
95
96 help(argc - 1, argv + 1);
97
98 return -1;
99}
100
101bool is_prefix(const char *pfx, const char *str)
102{
103 if (!pfx)
104 return false;
105 if (strlen(str) < strlen(pfx))
106 return false;
107
108 return !memcmp(str, pfx, strlen(pfx));
109}
110
111void fprint_hex(FILE *f, void *arg, unsigned int n, const char *sep)
112{
113 unsigned char *data = arg;
114 unsigned int i;
115
116 for (i = 0; i < n; i++) {
117 const char *pfx = "";
118
119 if (!i)
120 ;
121 else if (!(i % 16))
122 fprintf(f, "\n");
123 else if (!(i % 8))
124 fprintf(f, " ");
125 else
126 pfx = sep;
127
128 fprintf(f, "%s%02hhx", i ? pfx : "", data[i]);
129 }
130}
131
132
133static int make_args(char *line, char *n_argv[], int maxargs, int cmd_nb)
134{
135 static const char ws[] = " \t\r\n";
136 char *cp = line;
137 int n_argc = 0;
138
139 while (*cp) {
140
141 cp += strspn(cp, ws);
142
143 if (*cp == '\0')
144 break;
145
146 if (n_argc >= (maxargs - 1)) {
147 p_err("too many arguments to command %d", cmd_nb);
148 return -1;
149 }
150
151
152 if (*cp == '\'' || *cp == '"') {
153 char quote = *cp++;
154
155 n_argv[n_argc++] = cp;
156
157 cp = strchr(cp, quote);
158 if (!cp) {
159 p_err("unterminated quoted string in command %d",
160 cmd_nb);
161 return -1;
162 }
163 } else {
164 n_argv[n_argc++] = cp;
165
166
167 cp += strcspn(cp, ws);
168 if (*cp == '\0')
169 break;
170 }
171
172
173 *cp++ = 0;
174 }
175 n_argv[n_argc] = NULL;
176
177 return n_argc;
178}
179
180static int do_batch(int argc, char **argv);
181
182static const struct cmd cmds[] = {
183 { "help", do_help },
184 { "batch", do_batch },
185 { "prog", do_prog },
186 { "map", do_map },
187 { "cgroup", do_cgroup },
188 { "perf", do_perf },
189 { "net", do_net },
190 { "feature", do_feature },
191 { "version", do_version },
192 { 0 }
193};
194
195static int do_batch(int argc, char **argv)
196{
197 char buf[BATCH_LINE_LEN_MAX], contline[BATCH_LINE_LEN_MAX];
198 char *n_argv[BATCH_ARG_NB_MAX];
199 unsigned int lines = 0;
200 int n_argc;
201 FILE *fp;
202 char *cp;
203 int err;
204 int i;
205
206 if (argc < 2) {
207 p_err("too few parameters for batch");
208 return -1;
209 } else if (!is_prefix(*argv, "file")) {
210 p_err("expected 'file', got: %s", *argv);
211 return -1;
212 } else if (argc > 2) {
213 p_err("too many parameters for batch");
214 return -1;
215 }
216 NEXT_ARG();
217
218 if (!strcmp(*argv, "-"))
219 fp = stdin;
220 else
221 fp = fopen(*argv, "r");
222 if (!fp) {
223 p_err("Can't open file (%s): %s", *argv, strerror(errno));
224 return -1;
225 }
226
227 if (json_output)
228 jsonw_start_array(json_wtr);
229 while (fgets(buf, sizeof(buf), fp)) {
230 cp = strchr(buf, '#');
231 if (cp)
232 *cp = '\0';
233
234 if (strlen(buf) == sizeof(buf) - 1) {
235 errno = E2BIG;
236 break;
237 }
238
239
240
241
242 while ((cp = strstr(buf, "\\\n")) != NULL) {
243 if (!fgets(contline, sizeof(contline), fp) ||
244 strlen(contline) == 0) {
245 p_err("missing continuation line on command %d",
246 lines);
247 err = -1;
248 goto err_close;
249 }
250
251 cp = strchr(contline, '#');
252 if (cp)
253 *cp = '\0';
254
255 if (strlen(buf) + strlen(contline) + 1 > sizeof(buf)) {
256 p_err("command %d is too long", lines);
257 err = -1;
258 goto err_close;
259 }
260 buf[strlen(buf) - 2] = '\0';
261 strcat(buf, contline);
262 }
263
264 n_argc = make_args(buf, n_argv, BATCH_ARG_NB_MAX, lines);
265 if (!n_argc)
266 continue;
267 if (n_argc < 0)
268 goto err_close;
269
270 if (json_output) {
271 jsonw_start_object(json_wtr);
272 jsonw_name(json_wtr, "command");
273 jsonw_start_array(json_wtr);
274 for (i = 0; i < n_argc; i++)
275 jsonw_string(json_wtr, n_argv[i]);
276 jsonw_end_array(json_wtr);
277 jsonw_name(json_wtr, "output");
278 }
279
280 err = cmd_select(cmds, n_argc, n_argv, do_help);
281
282 if (json_output)
283 jsonw_end_object(json_wtr);
284
285 if (err)
286 goto err_close;
287
288 lines++;
289 }
290
291 if (errno && errno != ENOENT) {
292 p_err("reading batch file failed: %s", strerror(errno));
293 err = -1;
294 } else {
295 if (!json_output)
296 printf("processed %d commands\n", lines);
297 err = 0;
298 }
299err_close:
300 if (fp != stdin)
301 fclose(fp);
302
303 if (json_output)
304 jsonw_end_array(json_wtr);
305
306 return err;
307}
308
309int main(int argc, char **argv)
310{
311 static const struct option options[] = {
312 { "json", no_argument, NULL, 'j' },
313 { "help", no_argument, NULL, 'h' },
314 { "pretty", no_argument, NULL, 'p' },
315 { "version", no_argument, NULL, 'V' },
316 { "bpffs", no_argument, NULL, 'f' },
317 { "mapcompat", no_argument, NULL, 'm' },
318 { "nomount", no_argument, NULL, 'n' },
319 { 0 }
320 };
321 int opt, ret;
322
323 last_do_help = do_help;
324 pretty_output = false;
325 json_output = false;
326 show_pinned = false;
327 block_mount = false;
328 bin_name = argv[0];
329
330 hash_init(prog_table.table);
331 hash_init(map_table.table);
332
333 opterr = 0;
334 while ((opt = getopt_long(argc, argv, "Vhpjfmn",
335 options, NULL)) >= 0) {
336 switch (opt) {
337 case 'V':
338 return do_version(argc, argv);
339 case 'h':
340 return do_help(argc, argv);
341 case 'p':
342 pretty_output = true;
343
344 case 'j':
345 if (!json_output) {
346 json_wtr = jsonw_new(stdout);
347 if (!json_wtr) {
348 p_err("failed to create JSON writer");
349 return -1;
350 }
351 json_output = true;
352 }
353 jsonw_pretty(json_wtr, pretty_output);
354 break;
355 case 'f':
356 show_pinned = true;
357 break;
358 case 'm':
359 bpf_flags = MAPS_RELAX_COMPAT;
360 break;
361 case 'n':
362 block_mount = true;
363 break;
364 default:
365 p_err("unrecognized option '%s'", argv[optind - 1]);
366 if (json_output)
367 clean_and_exit(-1);
368 else
369 usage();
370 }
371 }
372
373 argc -= optind;
374 argv += optind;
375 if (argc < 0)
376 usage();
377
378 ret = cmd_select(cmds, argc, argv, do_help);
379
380 if (json_output)
381 jsonw_destroy(&json_wtr);
382
383 if (show_pinned) {
384 delete_pinned_obj_table(&prog_table);
385 delete_pinned_obj_table(&map_table);
386 }
387
388 return ret;
389}
390
