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36#include <bfd.h>
37#include <ctype.h>
38#include <errno.h>
39#include <getopt.h>
40#include <linux/bpf.h>
41#include <stdio.h>
42#include <stdlib.h>
43#include <string.h>
44
45#include <bpf.h>
46
47#include "main.h"
48
49#define BATCH_LINE_LEN_MAX 65536
50#define BATCH_ARG_NB_MAX 4096
51
52const char *bin_name;
53static int last_argc;
54static char **last_argv;
55static int (*last_do_help)(int argc, char **argv);
56json_writer_t *json_wtr;
57bool pretty_output;
58bool json_output;
59bool show_pinned;
60struct pinned_obj_table prog_table;
61struct pinned_obj_table map_table;
62
63static void __noreturn clean_and_exit(int i)
64{
65 if (json_output)
66 jsonw_destroy(&json_wtr);
67
68 exit(i);
69}
70
71void usage(void)
72{
73 last_do_help(last_argc - 1, last_argv + 1);
74
75 clean_and_exit(-1);
76}
77
78static int do_help(int argc, char **argv)
79{
80 if (json_output) {
81 jsonw_null(json_wtr);
82 return 0;
83 }
84
85 fprintf(stderr,
86 "Usage: %s [OPTIONS] OBJECT { COMMAND | help }\n"
87 " %s batch file FILE\n"
88 " %s version\n"
89 "\n"
90 " OBJECT := { prog | map | cgroup }\n"
91 " " HELP_SPEC_OPTIONS "\n"
92 "",
93 bin_name, bin_name, bin_name);
94
95 return 0;
96}
97
98static int do_version(int argc, char **argv)
99{
100 if (json_output) {
101 jsonw_start_object(json_wtr);
102 jsonw_name(json_wtr, "version");
103 jsonw_printf(json_wtr, "\"%s\"", BPFTOOL_VERSION);
104 jsonw_end_object(json_wtr);
105 } else {
106 printf("%s v%s\n", bin_name, BPFTOOL_VERSION);
107 }
108 return 0;
109}
110
111int cmd_select(const struct cmd *cmds, int argc, char **argv,
112 int (*help)(int argc, char **argv))
113{
114 unsigned int i;
115
116 last_argc = argc;
117 last_argv = argv;
118 last_do_help = help;
119
120 if (argc < 1 && cmds[0].func)
121 return cmds[0].func(argc, argv);
122
123 for (i = 0; cmds[i].func; i++)
124 if (is_prefix(*argv, cmds[i].cmd))
125 return cmds[i].func(argc - 1, argv + 1);
126
127 help(argc - 1, argv + 1);
128
129 return -1;
130}
131
132bool is_prefix(const char *pfx, const char *str)
133{
134 if (!pfx)
135 return false;
136 if (strlen(str) < strlen(pfx))
137 return false;
138
139 return !memcmp(str, pfx, strlen(pfx));
140}
141
142void fprint_hex(FILE *f, void *arg, unsigned int n, const char *sep)
143{
144 unsigned char *data = arg;
145 unsigned int i;
146
147 for (i = 0; i < n; i++) {
148 const char *pfx = "";
149
150 if (!i)
151 ;
152 else if (!(i % 16))
153 fprintf(f, "\n");
154 else if (!(i % 8))
155 fprintf(f, " ");
156 else
157 pfx = sep;
158
159 fprintf(f, "%s%02hhx", i ? pfx : "", data[i]);
160 }
161}
162
163
164static int make_args(char *line, char *n_argv[], int maxargs, int cmd_nb)
165{
166 static const char ws[] = " \t\r\n";
167 char *cp = line;
168 int n_argc = 0;
169
170 while (*cp) {
171
172 cp += strspn(cp, ws);
173
174 if (*cp == '\0')
175 break;
176
177 if (n_argc >= (maxargs - 1)) {
178 p_err("too many arguments to command %d", cmd_nb);
179 return -1;
180 }
181
182
183 if (*cp == '\'' || *cp == '"') {
184 char quote = *cp++;
185
186 n_argv[n_argc++] = cp;
187
188 cp = strchr(cp, quote);
189 if (!cp) {
190 p_err("unterminated quoted string in command %d",
191 cmd_nb);
192 return -1;
193 }
194 } else {
195 n_argv[n_argc++] = cp;
196
197
198 cp += strcspn(cp, ws);
199 if (*cp == '\0')
200 break;
201 }
202
203
204 *cp++ = 0;
205 }
206 n_argv[n_argc] = NULL;
207
208 return n_argc;
209}
210
211static int do_batch(int argc, char **argv);
212
213static const struct cmd cmds[] = {
214 { "help", do_help },
215 { "batch", do_batch },
216 { "prog", do_prog },
217 { "map", do_map },
218 { "cgroup", do_cgroup },
219 { "version", do_version },
220 { 0 }
221};
222
223static int do_batch(int argc, char **argv)
224{
225 char buf[BATCH_LINE_LEN_MAX], contline[BATCH_LINE_LEN_MAX];
226 char *n_argv[BATCH_ARG_NB_MAX];
227 unsigned int lines = 0;
228 int n_argc;
229 FILE *fp;
230 char *cp;
231 int err;
232 int i;
233
234 if (argc < 2) {
235 p_err("too few parameters for batch");
236 return -1;
237 } else if (!is_prefix(*argv, "file")) {
238 p_err("expected 'file', got: %s", *argv);
239 return -1;
240 } else if (argc > 2) {
241 p_err("too many parameters for batch");
242 return -1;
243 }
244 NEXT_ARG();
245
246 if (!strcmp(*argv, "-"))
247 fp = stdin;
248 else
249 fp = fopen(*argv, "r");
250 if (!fp) {
251 p_err("Can't open file (%s): %s", *argv, strerror(errno));
252 return -1;
253 }
254
255 if (json_output)
256 jsonw_start_array(json_wtr);
257 while (fgets(buf, sizeof(buf), fp)) {
258 cp = strchr(buf, '#');
259 if (cp)
260 *cp = '\0';
261
262 if (strlen(buf) == sizeof(buf) - 1) {
263 errno = E2BIG;
264 break;
265 }
266
267
268
269
270 while ((cp = strstr(buf, "\\\n")) != NULL) {
271 if (!fgets(contline, sizeof(contline), fp) ||
272 strlen(contline) == 0) {
273 p_err("missing continuation line on command %d",
274 lines);
275 err = -1;
276 goto err_close;
277 }
278
279 cp = strchr(contline, '#');
280 if (cp)
281 *cp = '\0';
282
283 if (strlen(buf) + strlen(contline) + 1 > sizeof(buf)) {
284 p_err("command %d is too long", lines);
285 err = -1;
286 goto err_close;
287 }
288 buf[strlen(buf) - 2] = '\0';
289 strcat(buf, contline);
290 }
291
292 n_argc = make_args(buf, n_argv, BATCH_ARG_NB_MAX, lines);
293 if (!n_argc)
294 continue;
295 if (n_argc < 0)
296 goto err_close;
297
298 if (json_output) {
299 jsonw_start_object(json_wtr);
300 jsonw_name(json_wtr, "command");
301 jsonw_start_array(json_wtr);
302 for (i = 0; i < n_argc; i++)
303 jsonw_string(json_wtr, n_argv[i]);
304 jsonw_end_array(json_wtr);
305 jsonw_name(json_wtr, "output");
306 }
307
308 err = cmd_select(cmds, n_argc, n_argv, do_help);
309
310 if (json_output)
311 jsonw_end_object(json_wtr);
312
313 if (err)
314 goto err_close;
315
316 lines++;
317 }
318
319 if (errno && errno != ENOENT) {
320 p_err("reading batch file failed: %s", strerror(errno));
321 err = -1;
322 } else {
323 p_info("processed %d commands", lines);
324 err = 0;
325 }
326err_close:
327 if (fp != stdin)
328 fclose(fp);
329
330 if (json_output)
331 jsonw_end_array(json_wtr);
332
333 return err;
334}
335
336int main(int argc, char **argv)
337{
338 static const struct option options[] = {
339 { "json", no_argument, NULL, 'j' },
340 { "help", no_argument, NULL, 'h' },
341 { "pretty", no_argument, NULL, 'p' },
342 { "version", no_argument, NULL, 'V' },
343 { "bpffs", no_argument, NULL, 'f' },
344 { 0 }
345 };
346 int opt, ret;
347
348 last_do_help = do_help;
349 pretty_output = false;
350 json_output = false;
351 show_pinned = false;
352 bin_name = argv[0];
353
354 hash_init(prog_table.table);
355 hash_init(map_table.table);
356
357 opterr = 0;
358 while ((opt = getopt_long(argc, argv, "Vhpjf",
359 options, NULL)) >= 0) {
360 switch (opt) {
361 case 'V':
362 return do_version(argc, argv);
363 case 'h':
364 return do_help(argc, argv);
365 case 'p':
366 pretty_output = true;
367
368 case 'j':
369 if (!json_output) {
370 json_wtr = jsonw_new(stdout);
371 if (!json_wtr) {
372 p_err("failed to create JSON writer");
373 return -1;
374 }
375 json_output = true;
376 }
377 jsonw_pretty(json_wtr, pretty_output);
378 break;
379 case 'f':
380 show_pinned = true;
381 break;
382 default:
383 p_err("unrecognized option '%s'", argv[optind - 1]);
384 if (json_output)
385 clean_and_exit(-1);
386 else
387 usage();
388 }
389 }
390
391 argc -= optind;
392 argv += optind;
393 if (argc < 0)
394 usage();
395
396 bfd_init();
397
398 ret = cmd_select(cmds, argc, argv, do_help);
399
400 if (json_output)
401 jsonw_destroy(&json_wtr);
402
403 if (show_pinned) {
404 delete_pinned_obj_table(&prog_table);
405 delete_pinned_obj_table(&map_table);
406 }
407
408 return ret;
409}
410
