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Date: Sat, 22 Feb 2014 18:37:53 +0100
From: Daniel Borkmann <dborkman@...hat.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org
Subject: [PATCH net-next] 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@...hat.com>
---
tools/net/bpf_dbg.c | 119 ++++++++++++++++++++++++----------------------------
1 file changed, 55 insertions(+), 64 deletions(-)
diff --git a/tools/net/bpf_dbg.c b/tools/net/bpf_dbg.c
index 65dc757..bb31813 100644
--- a/tools/net/bpf_dbg.c
+++ b/tools/net/bpf_dbg.c
@@ -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;
}
--
1.7.11.7
--
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