tools: bpf_dbg: various misc code cleanups
Lets clean up bpf_dbg a bit and improve its code slightly in various areas: i) Get rid of some macros as there's no good reason for keeping them, ii) remove one unused variable and reduce scope of various variables found by cppcheck, iii) Close non-default file descriptors when exiting the shell. Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
b17c706987
commit
7debf7806e
|
@ -87,9 +87,6 @@
|
|||
__attribute__ ((format (printf, (pos_fmtstr), (pos_fmtargs))))
|
||||
#endif
|
||||
|
||||
#define CMD(_name, _func) { .name = _name, .func = _func, }
|
||||
#define OP(_op, _name) [_op] = _name
|
||||
|
||||
enum {
|
||||
CMD_OK,
|
||||
CMD_ERR,
|
||||
|
@ -145,32 +142,32 @@ static size_t pcap_map_size = 0;
|
|||
static char *pcap_ptr_va_start, *pcap_ptr_va_curr;
|
||||
|
||||
static const char * const op_table[] = {
|
||||
OP(BPF_ST, "st"),
|
||||
OP(BPF_STX, "stx"),
|
||||
OP(BPF_LD_B, "ldb"),
|
||||
OP(BPF_LD_H, "ldh"),
|
||||
OP(BPF_LD_W, "ld"),
|
||||
OP(BPF_LDX, "ldx"),
|
||||
OP(BPF_LDX_B, "ldxb"),
|
||||
OP(BPF_JMP_JA, "ja"),
|
||||
OP(BPF_JMP_JEQ, "jeq"),
|
||||
OP(BPF_JMP_JGT, "jgt"),
|
||||
OP(BPF_JMP_JGE, "jge"),
|
||||
OP(BPF_JMP_JSET, "jset"),
|
||||
OP(BPF_ALU_ADD, "add"),
|
||||
OP(BPF_ALU_SUB, "sub"),
|
||||
OP(BPF_ALU_MUL, "mul"),
|
||||
OP(BPF_ALU_DIV, "div"),
|
||||
OP(BPF_ALU_MOD, "mod"),
|
||||
OP(BPF_ALU_NEG, "neg"),
|
||||
OP(BPF_ALU_AND, "and"),
|
||||
OP(BPF_ALU_OR, "or"),
|
||||
OP(BPF_ALU_XOR, "xor"),
|
||||
OP(BPF_ALU_LSH, "lsh"),
|
||||
OP(BPF_ALU_RSH, "rsh"),
|
||||
OP(BPF_MISC_TAX, "tax"),
|
||||
OP(BPF_MISC_TXA, "txa"),
|
||||
OP(BPF_RET, "ret"),
|
||||
[BPF_ST] = "st",
|
||||
[BPF_STX] = "stx",
|
||||
[BPF_LD_B] = "ldb",
|
||||
[BPF_LD_H] = "ldh",
|
||||
[BPF_LD_W] = "ld",
|
||||
[BPF_LDX] = "ldx",
|
||||
[BPF_LDX_B] = "ldxb",
|
||||
[BPF_JMP_JA] = "ja",
|
||||
[BPF_JMP_JEQ] = "jeq",
|
||||
[BPF_JMP_JGT] = "jgt",
|
||||
[BPF_JMP_JGE] = "jge",
|
||||
[BPF_JMP_JSET] = "jset",
|
||||
[BPF_ALU_ADD] = "add",
|
||||
[BPF_ALU_SUB] = "sub",
|
||||
[BPF_ALU_MUL] = "mul",
|
||||
[BPF_ALU_DIV] = "div",
|
||||
[BPF_ALU_MOD] = "mod",
|
||||
[BPF_ALU_NEG] = "neg",
|
||||
[BPF_ALU_AND] = "and",
|
||||
[BPF_ALU_OR] = "or",
|
||||
[BPF_ALU_XOR] = "xor",
|
||||
[BPF_ALU_LSH] = "lsh",
|
||||
[BPF_ALU_RSH] = "rsh",
|
||||
[BPF_MISC_TAX] = "tax",
|
||||
[BPF_MISC_TXA] = "txa",
|
||||
[BPF_RET] = "ret",
|
||||
};
|
||||
|
||||
static __check_format_printf(1, 2) int rl_printf(const char *fmt, ...)
|
||||
|
@ -1127,7 +1124,6 @@ static int cmd_step(char *num)
|
|||
static int cmd_select(char *num)
|
||||
{
|
||||
unsigned int which, i;
|
||||
struct pcap_pkthdr *hdr;
|
||||
bool have_next = true;
|
||||
|
||||
if (!pcap_loaded() || strlen(num) == 0)
|
||||
|
@ -1144,7 +1140,7 @@ static int cmd_select(char *num)
|
|||
|
||||
for (i = 0; i < which && (have_next = pcap_next_pkt()); i++)
|
||||
/* noop */;
|
||||
if (!have_next || (hdr = pcap_curr_pkt()) == NULL) {
|
||||
if (!have_next || pcap_curr_pkt() == NULL) {
|
||||
rl_printf("no packet #%u available!\n", which);
|
||||
pcap_reset_pkt();
|
||||
return CMD_ERR;
|
||||
|
@ -1177,9 +1173,8 @@ static int cmd_breakpoint(char *subcmd)
|
|||
static int cmd_run(char *num)
|
||||
{
|
||||
static uint32_t pass = 0, fail = 0;
|
||||
struct pcap_pkthdr *hdr;
|
||||
bool has_limit = true;
|
||||
int ret, pkts = 0, i = 0;
|
||||
int pkts = 0, i = 0;
|
||||
|
||||
if (!bpf_prog_loaded() || !pcap_loaded())
|
||||
return CMD_ERR;
|
||||
|
@ -1189,10 +1184,10 @@ static int cmd_run(char *num)
|
|||
has_limit = false;
|
||||
|
||||
do {
|
||||
hdr = pcap_curr_pkt();
|
||||
ret = bpf_run_all(bpf_image, bpf_prog_len,
|
||||
(uint8_t *) hdr + sizeof(*hdr),
|
||||
hdr->caplen, hdr->len);
|
||||
struct pcap_pkthdr *hdr = pcap_curr_pkt();
|
||||
int ret = bpf_run_all(bpf_image, bpf_prog_len,
|
||||
(uint8_t *) hdr + sizeof(*hdr),
|
||||
hdr->caplen, hdr->len);
|
||||
if (ret > 0)
|
||||
pass++;
|
||||
else if (ret == 0)
|
||||
|
@ -1245,14 +1240,14 @@ static int cmd_quit(char *dontcare)
|
|||
}
|
||||
|
||||
static const struct shell_cmd cmds[] = {
|
||||
CMD("load", cmd_load),
|
||||
CMD("select", cmd_select),
|
||||
CMD("step", cmd_step),
|
||||
CMD("run", cmd_run),
|
||||
CMD("breakpoint", cmd_breakpoint),
|
||||
CMD("disassemble", cmd_disassemble),
|
||||
CMD("dump", cmd_dump),
|
||||
CMD("quit", cmd_quit),
|
||||
{ .name = "load", .func = cmd_load },
|
||||
{ .name = "select", .func = cmd_select },
|
||||
{ .name = "step", .func = cmd_step },
|
||||
{ .name = "run", .func = cmd_run },
|
||||
{ .name = "breakpoint", .func = cmd_breakpoint },
|
||||
{ .name = "disassemble", .func = cmd_disassemble },
|
||||
{ .name = "dump", .func = cmd_dump },
|
||||
{ .name = "quit", .func = cmd_quit },
|
||||
};
|
||||
|
||||
static int execf(char *arg)
|
||||
|
@ -1280,7 +1275,6 @@ out:
|
|||
static char *shell_comp_gen(const char *buf, int state)
|
||||
{
|
||||
static int list_index, len;
|
||||
const char *name;
|
||||
|
||||
if (!state) {
|
||||
list_index = 0;
|
||||
|
@ -1288,9 +1282,9 @@ static char *shell_comp_gen(const char *buf, int state)
|
|||
}
|
||||
|
||||
for (; list_index < array_size(cmds); ) {
|
||||
name = cmds[list_index].name;
|
||||
list_index++;
|
||||
const char *name = cmds[list_index].name;
|
||||
|
||||
list_index++;
|
||||
if (strncmp(name, buf, len) == 0)
|
||||
return strdup(name);
|
||||
}
|
||||
|
@ -1322,16 +1316,9 @@ static void init_shell(FILE *fin, FILE *fout)
|
|||
{
|
||||
char file[128];
|
||||
|
||||
memset(file, 0, sizeof(file));
|
||||
snprintf(file, sizeof(file) - 1,
|
||||
"%s/.bpf_dbg_history", getenv("HOME"));
|
||||
|
||||
snprintf(file, sizeof(file), "%s/.bpf_dbg_history", getenv("HOME"));
|
||||
read_history(file);
|
||||
|
||||
memset(file, 0, sizeof(file));
|
||||
snprintf(file, sizeof(file) - 1,
|
||||
"%s/.bpf_dbg_init", getenv("HOME"));
|
||||
|
||||
rl_instream = fin;
|
||||
rl_outstream = fout;
|
||||
|
||||
|
@ -1348,37 +1335,41 @@ static void init_shell(FILE *fin, FILE *fout)
|
|||
rl_bind_key_in_map('\t', rl_complete, emacs_meta_keymap);
|
||||
rl_bind_key_in_map('\033', rl_complete, emacs_meta_keymap);
|
||||
|
||||
snprintf(file, sizeof(file), "%s/.bpf_dbg_init", getenv("HOME"));
|
||||
rl_read_init_file(file);
|
||||
|
||||
rl_prep_terminal(0);
|
||||
rl_set_signals();
|
||||
|
||||
signal(SIGINT, intr_shell);
|
||||
}
|
||||
|
||||
static void exit_shell(void)
|
||||
static void exit_shell(FILE *fin, FILE *fout)
|
||||
{
|
||||
char file[128];
|
||||
|
||||
memset(file, 0, sizeof(file));
|
||||
snprintf(file, sizeof(file) - 1,
|
||||
"%s/.bpf_dbg_history", getenv("HOME"));
|
||||
|
||||
snprintf(file, sizeof(file), "%s/.bpf_dbg_history", getenv("HOME"));
|
||||
write_history(file);
|
||||
|
||||
clear_history();
|
||||
rl_deprep_terminal();
|
||||
|
||||
try_close_pcap();
|
||||
|
||||
if (fin != stdin)
|
||||
fclose(fin);
|
||||
if (fout != stdout)
|
||||
fclose(fout);
|
||||
}
|
||||
|
||||
static int run_shell_loop(FILE *fin, FILE *fout)
|
||||
{
|
||||
char *buf;
|
||||
int ret;
|
||||
|
||||
init_shell(fin, fout);
|
||||
|
||||
while ((buf = readline("> ")) != NULL) {
|
||||
ret = execf(buf);
|
||||
int ret = execf(buf);
|
||||
if (ret == CMD_EX)
|
||||
break;
|
||||
if (ret == CMD_OK && strlen(buf) > 0)
|
||||
|
@ -1387,7 +1378,7 @@ static int run_shell_loop(FILE *fin, FILE *fout)
|
|||
free(buf);
|
||||
}
|
||||
|
||||
exit_shell();
|
||||
exit_shell(fin, fout);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
Loading…
Reference in a new issue