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Date: Tue, 26 Sep 2017 16:45:39 -0700
From: Julien Fortin <julien@...ulusnetworks.com>
To: netdev@...r.kernel.org
Cc: roopa@...ulusnetworks.com, nikolay@...ulusnetworks.com,
dsa@...ulusnetworks.com, Julien Fortin <julien@...ulusnetworks.com>
Subject: [PATCH iproute2 v3] lib: json_print: rework 'new_json_obj' drop FILE* argument
From: Julien Fortin <julien@...ulusnetworks.com>
As Stephen Hemminger mentioned on the last submission the new_json_obj
function is always called with fp == stdout, so right now, there's no
need of this extra argument.
The background for the rework is the following:
The ip monitor didn't call `new_json_obj` (even for in non json context),
so the static FILE* _fp variable wasn't initialized, thus raising a
SIGSEGV in ipaddress.c. This patch should fix this issue for good, new
paths won't have to call `new_json_obj`.
How to reproduce:
$ ip -t mon label link
(gdb) bt
.#0 _IO_vfprintf_internal (s=s@...ry=0x0, format=format@...ry=0x45460d “%d: “, ap=ap@...ry=0x7fffffff7f18) at vfprintf.c:1278
.#1 0x0000000000451310 in color_fprintf (fp=0x0, attr=<optimized out>, fmt=0x45460d “%d: “) at color.c:108
.#2 0x000000000044a856 in print_color_int (t=t@...ry=PRINT_ANY, color=color@...ry=4294967295, key=key@...ry=0x4545fc “ifindex”,
fmt=fmt@...ry=0x45460d “%d: “, value=<optimized out>) at ip_print.c:132
.#3 0x000000000040ccd2 in print_int (value=<optimized out>, fmt=0x45460d “%d: “, key=0x4545fc “ifindex”, t=PRINT_ANY) at ip_common.h:189
.#4 print_linkinfo (who=<optimized out>, n=0x7fffffffa380, arg=0x7ffff77a82a0 <_IO_2_1_stdout_>) at ipaddress.c:1107
.#5 0x0000000000422e13 in accept_msg (who=0x7fffffff8320, ctrl=0x7fffffff8310, n=0x7fffffffa380, arg=0x7ffff77a82a0 <_IO_2_1_stdout_>) at ipmonitor.c:89
.#6 0x000000000044c58f in rtnl_listen (rtnl=0x672160 <rth>, handler=handler@...ry=0x422c70 <accept_msg>, jarg=0x7ffff77a82a0 <_IO_2_1_stdout_>)
at libnetlink.c:761
.#7 0x00000000004233db in do_ipmonitor (argc=<optimized out>, argv=0x7fffffffe5a0) at ipmonitor.c:310
.#8 0x0000000000408f74 in do_cmd (argv0=0x7fffffffe7f5 “mon”, argc=3, argv=0x7fffffffe588) at ip.c:116
.#9 0x0000000000408a94 in main (argc=4, argv=0x7fffffffe580) at ip.c:311
Fixes: 6377572f ("ip: ip_print: add new API to print JSON or regular format output")
Reported-by: David Ahern <dsa@...ulusnetworks.com>
Signed-off-by: Julien Fortin <julien@...ulusnetworks.com>
---
include/json_print.h | 4 +---
ip/ipaddress.c | 4 ++--
lib/json_print.c | 31 ++++++++++---------------------
3 files changed, 13 insertions(+), 26 deletions(-)
diff --git a/include/json_print.h b/include/json_print.h
index 44cf5ac5..b6ce1f9f 100644
--- a/include/json_print.h
+++ b/include/json_print.h
@@ -29,13 +29,11 @@ enum output_type {
PRINT_ANY = 4,
};
-void new_json_obj(int json, FILE *fp);
+void new_json_obj(int json);
void delete_json_obj(void);
bool is_json_context(void);
-void set_current_fp(FILE *fp);
-
void fflush_fp(void);
void open_json_object(const char *str);
diff --git a/ip/ipaddress.c b/ip/ipaddress.c
index b8bc387a..9e9a7e0a 100644
--- a/ip/ipaddress.c
+++ b/ip/ipaddress.c
@@ -1815,7 +1815,7 @@ static int ipaddr_showdump(void)
if (ipadd_dump_check_magic())
exit(-1);
- new_json_obj(json, stdout);
+ new_json_obj(json);
open_json_object(NULL);
open_json_array(PRINT_JSON, "addr_info");
@@ -2176,7 +2176,7 @@ static int ipaddr_list_flush_or_save(int argc, char **argv, int action)
* Initialize a json_writer and open an array object
* if -json was specified.
*/
- new_json_obj(json, stdout);
+ new_json_obj(json);
/*
* If only filter_dev present and none of the other
diff --git a/lib/json_print.c b/lib/json_print.c
index 93b4119d..aa527af6 100644
--- a/lib/json_print.c
+++ b/lib/json_print.c
@@ -16,15 +16,14 @@
#include "json_print.h"
static json_writer_t *_jw;
-static FILE *_fp;
#define _IS_JSON_CONTEXT(type) ((type & PRINT_JSON || type & PRINT_ANY) && _jw)
#define _IS_FP_CONTEXT(type) (!_jw && (type & PRINT_FP || type & PRINT_ANY))
-void new_json_obj(int json, FILE *fp)
+void new_json_obj(int json)
{
if (json) {
- _jw = jsonw_new(fp);
+ _jw = jsonw_new(stdout);
if (!_jw) {
perror("json object");
exit(1);
@@ -32,7 +31,6 @@ void new_json_obj(int json, FILE *fp)
jsonw_pretty(_jw, true);
jsonw_start_array(_jw);
}
- set_current_fp(fp);
}
void delete_json_obj(void)
@@ -48,15 +46,6 @@ bool is_json_context(void)
return _jw != NULL;
}
-void set_current_fp(FILE *fp)
-{
- if (!fp) {
- fprintf(stderr, "Error: invalid file pointer.\n");
- exit(1);
- }
- _fp = fp;
-}
-
json_writer_t *get_json_writer(void)
{
return _jw;
@@ -89,7 +78,7 @@ void open_json_array(enum output_type type, const char *str)
jsonw_name(_jw, str);
jsonw_start_array(_jw);
} else if (_IS_FP_CONTEXT(type)) {
- fprintf(_fp, "%s", str);
+ printf("%s", str);
}
}
@@ -103,7 +92,7 @@ void close_json_array(enum output_type type, const char *str)
jsonw_end_array(_jw);
jsonw_pretty(_jw, true);
} else if (_IS_FP_CONTEXT(type)) {
- fprintf(_fp, "%s", str);
+ printf("%s", str);
}
}
@@ -124,7 +113,7 @@ void close_json_array(enum output_type type, const char *str)
else \
jsonw_##type_name##_field(_jw, key, value); \
} else if (_IS_FP_CONTEXT(t)) { \
- color_fprintf(_fp, color, fmt, value); \
+ color_fprintf(stdout, color, fmt, value); \
} \
}
_PRINT_FUNC(int, int);
@@ -147,7 +136,7 @@ void print_color_string(enum output_type type,
else
jsonw_string_field(_jw, key, value);
} else if (_IS_FP_CONTEXT(type)) {
- color_fprintf(_fp, color, fmt, value);
+ color_fprintf(stdout, color, fmt, value);
}
}
@@ -168,7 +157,7 @@ void print_color_bool(enum output_type type,
else
jsonw_bool(_jw, value);
} else if (_IS_FP_CONTEXT(type)) {
- color_fprintf(_fp, color, fmt, value ? "true" : "false");
+ color_fprintf(stdout, color, fmt, value ? "true" : "false");
}
}
@@ -187,7 +176,7 @@ void print_color_0xhex(enum output_type type,
snprintf(b1, sizeof(b1), "%#x", hex);
print_string(PRINT_JSON, key, NULL, b1);
} else if (_IS_FP_CONTEXT(type)) {
- color_fprintf(_fp, color, fmt, hex);
+ color_fprintf(stdout, color, fmt, hex);
}
}
@@ -206,7 +195,7 @@ void print_color_hex(enum output_type type,
else
jsonw_string(_jw, b1);
} else if (_IS_FP_CONTEXT(type)) {
- color_fprintf(_fp, color, fmt, hex);
+ color_fprintf(stdout, color, fmt, hex);
}
}
@@ -226,6 +215,6 @@ void print_color_null(enum output_type type,
else
jsonw_null(_jw);
} else if (_IS_FP_CONTEXT(type)) {
- color_fprintf(_fp, color, fmt, value);
+ color_fprintf(stdout, color, fmt, value);
}
}
--
2.14.1
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