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sysctl-util: make sysctl_read_ip_property() a wrapper around sysctl_read()

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let's do what we did for sysctl_write()/sysctl_write_ip_property() also
for the read paths: i.e. make one a wrapper of the other, and add more
careful input validation.
This commit is contained in:
Lennart Poettering 2021-09-15 09:22:06 +02:00
parent f9755203b9
commit d1469b7095
1 changed files with 9 additions and 13 deletions
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22
src/basic/sysctl-util.c
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@ -118,24 +118,20 @@ int sysctl_read(const char *property, char **ret) {
}
int sysctl_read_ip_property(int af, const char *ifname, const char *property, char **ret) {
_cleanup_free_ char *value = NULL;
const char *p;
int r;
assert(IN_SET(af, AF_INET, AF_INET6));
assert(property);
p = strjoina("/proc/sys/net/ipv", af == AF_INET ? "4" : "6",
ifname ? "/conf/" : "", strempty(ifname),
property[0] == '/' ? "" : "/", property);
if (!IN_SET(af, AF_INET, AF_INET6))
return -EAFNOSUPPORT;
r = read_full_virtual_file(p, &value, NULL);
if (r < 0)
return r;
if (ifname) {
if (!ifname_valid_full(ifname, IFNAME_VALID_SPECIAL))
return -EINVAL;
truncate_nl(value);
if (ret)
*ret = TAKE_PTR(value);
p = strjoina("net/", af_to_ipv4_ipv6(af), "/conf/", ifname, "/", property);
} else
p = strjoina("net/", af_to_ipv4_ipv6(af), "/", property);
return r;
return sysctl_read(p, ret);
}