1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
|
/*
* src/utils.c Utilities
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation version 2.1
* of the License.
*
* Copyright (c) 2003-2009 Thomas Graf <tgraf@suug.ch>
*/
/**
* @defgroup cli Command Line Interface API
*
* @{
*
* These modules provide an interface for text based applications. The
* functions provided are wrappers for their libnl equivalent with
* added error handling. The functions check for allocation failures,
* invalid input, and unknown types and will print error messages
* accordingly via nl_cli_fatal().
*/
#include <netlink/cli/utils.h>
/**
* Parse a text based 32 bit unsigned integer argument
* @arg arg Integer in text form.
*
* Tries to convert the number provided in arg to a uint32_t. Will call
* nl_cli_fatal() if the conversion fails.
*
* @return 32bit unsigned integer.
*/
uint32_t nl_cli_parse_u32(const char *arg)
{
unsigned long lval;
char *endptr;
lval = strtoul(arg, &endptr, 0);
if (endptr == arg || lval == ULONG_MAX)
nl_cli_fatal(EINVAL, "Unable to parse \"%s\", not a number.",
arg);
return (uint32_t) lval;
}
void nl_cli_print_version(void)
{
printf("libnl tools version %s\n", LIBNL_VERSION);
printf(
"Copyright (C) 2003-2010 Thomas Graf <tgraf@redhat.com>\n"
"\n"
"This program comes with ABSOLUTELY NO WARRANTY. This is free \n"
"software, and you are welcome to redistribute it under certain\n"
"conditions. See the GNU General Public License for details.\n"
);
exit(0);
}
/**
* Print error message and quit application
* @arg err Error code.
* @arg fmt Error message.
*
* Prints the formatted error message to stderr and quits the application
* using the provided error code.
*/
void nl_cli_fatal(int err, const char *fmt, ...)
{
va_list ap;
fprintf(stderr, "Error: ");
if (fmt) {
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
fprintf(stderr, "\n");
} else
fprintf(stderr, "%s\n", strerror(err));
exit(abs(err));
}
int nl_cli_connect(struct nl_sock *sk, int protocol)
{
int err;
if ((err = nl_connect(sk, protocol)) < 0)
nl_cli_fatal(err, "Unable to connect netlink socket: %s",
nl_geterror(err));
return err;
}
struct nl_sock *nl_cli_alloc_socket(void)
{
struct nl_sock *sock;
if (!(sock = nl_socket_alloc()))
nl_cli_fatal(ENOBUFS, "Unable to allocate netlink socket");
return sock;
}
struct nl_addr *nl_cli_addr_parse(const char *str, int family)
{
struct nl_addr *addr;
int err;
if ((err = nl_addr_parse(str, family, &addr)) < 0)
nl_cli_fatal(err, "Unable to parse address \"%s\": %s",
str, nl_geterror(err));
return addr;
}
int nl_cli_parse_dumptype(const char *str)
{
if (!strcasecmp(str, "brief"))
return NL_DUMP_LINE;
else if (!strcasecmp(str, "details") || !strcasecmp(str, "detailed"))
return NL_DUMP_DETAILS;
else if (!strcasecmp(str, "stats"))
return NL_DUMP_STATS;
else
nl_cli_fatal(EINVAL, "Invalid dump type \"%s\".\n", str);
return 0;
}
int nl_cli_confirm(struct nl_object *obj, struct nl_dump_params *params,
int default_yes)
{
nl_object_dump(obj, params);
for (;;) {
char buf[32] = { 0 };
int answer;
printf("Delete? (%c/%c) ",
default_yes ? 'Y' : 'y',
default_yes ? 'n' : 'N');
if (!fgets(buf, sizeof(buf), stdin)) {
fprintf(stderr, "Error while reading\n.");
continue;
}
switch ((answer = tolower(buf[0]))) {
case '\n':
answer = default_yes ? 'y' : 'n';
case 'y':
case 'n':
return answer == 'y';
}
fprintf(stderr, "Invalid input, try again.\n");
}
return 0;
}
struct nl_cache *nl_cli_alloc_cache(struct nl_sock *sock, const char *name,
int (*ac)(struct nl_sock *, struct nl_cache **))
{
struct nl_cache *cache;
int err;
if ((err = ac(sock, &cache)) < 0)
nl_cli_fatal(err, "Unable to allocate %s cache: %s",
name, nl_geterror(err));
nl_cache_mngt_provide(cache);
return cache;
}
void nl_cli_load_module(const char *prefix, const char *name)
{
char path[FILENAME_MAX+1];
void *handle;
snprintf(path, sizeof(path), "%s/%s/%s.so",
PKGLIBDIR, prefix, name);
if (!(handle = dlopen(path, RTLD_NOW)))
nl_cli_fatal(ENOENT, "Unable to load module \"%s\": %s\n",
path, dlerror());
}
/** @} */
|
