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Fix getprotobyname missing on Android preventing use #470

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Fix getprotobyname missing on Android preventing use #470

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9d07f0c
FIX: getprotobyname missing on Android preventing use
Paliak May 17, 2026
85ee18b
Fix formatting in socket6.c
Paliak May 17, 2026
be8cc59
FIX: use existing OS detection for USE_GETPROTOBYNAME
Paliak May 31, 2026
0d09161
FIX: use value returned by getprotobyname when it is enabled
Paliak May 31, 2026
c2f67d0
Merge branch 'fix-getprotobyname-android' of https://github.com/Palia…
Paliak May 31, 2026
cb15cc5
MISC: remove extra new line
Paliak May 31, 2026
d335b8c
FIX: use AC_CHECK_FUNCS to check that getprotobyname exists before di…
Paliak Jun 9, 2026
4cd0304
FIX: remove use of getprotobyname
Paliak Jun 13, 2026
d48e910
Merge branch 'fix-getprotobyname-android' of https://github.com/Palia…
Paliak Jun 13, 2026
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6 changes: 6 additions & 0 deletions configure.ac
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@ m4_ifdef([AC_AUTOCONF_VERSION],[AC_USE_SYSTEM_EXTENSIONS], [AC_GNU_SOURCE])
# Detect Operatingsystem
AC_CANONICAL_TARGET
only_clock_realtime=no
use_getprotobyname=yes
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case "${target}" in
*darwin*)
Expand All @@ -21,6 +22,9 @@ case "${target}" in
*openbsd*)
only_clock_realtime=yes
;;
*android*)
use_getprotobyname=no
;;
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esac

dnl Detect IBM i PASE environment
Expand Down Expand Up @@ -104,6 +108,8 @@ AC_ARG_ENABLE([debug],
AS_IF([test "x$enable_debug" = "xyes"], [
AC_DEFINE([DEBUG], [1], [Define if debugging is enabled])])

AS_IF([test "x$use_getprotobyname" = "xyes"], [AC_DEFINE([USE_GETPROTOBYNAME], [1], [Enable use of getprotobyname])])
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AM_INIT_AUTOMAKE([-Wall -Werror foreign])
AM_MAINTAINER_MODE

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21 changes: 14 additions & 7 deletions src/socket4.c
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Expand Up @@ -59,20 +59,27 @@ static int outgoing_src_addr_set_ipv4 = 0;

int open_ping_socket_ipv4(int *socktype)
{
struct protoent* proto;
int s;
int s = -1;
int p_proto = IPPROTO_ICMP;

@schweikert schweikert Jun 10, 2026

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Can't we just use this on all platforms? It seems to me that maybe we don't need getprotobyname at all.

@Paliak Paliak Jun 10, 2026

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That was my thinking too. @gsnw-sebast suggested there may be situations where IPPROTO_ICMP differs from the return value of getprotobyname, so I added it back per that suggestion.

If we really want to check whether ICMP is supported on a given platform maybe we could just check for the define?

@gsnw-sebast gsnw-sebast Jun 11, 2026

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I looked into it, and you're actually right. The value could be set statically without the check via getprotobyname(). The numbers are assigned by the IANA [1], and even if fping were to support TCP or UDP in the future, these numbers would remain unchanged with TCP = 6 and UDP = 17.

It would even keep fping running if an incorrect protocol file were stored on the system

[1] https://www.iana.org/assignments/protocol-numbers/protocol-numbers.xhtml

@Paliak Paliak Jun 13, 2026

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Removed getprotobyname altogether in 4cd0304.


/* confirm that ICMP is available on this machine */
if ((proto = getprotobyname("icmp")) == NULL)
crash_and_burn("icmp: unknown protocol");
#ifdef USE_GETPROTOBYNAME
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{
/* confirm that ICMP is available on this machine */
struct protoent* proto = getprotobyname("icmp");
if (proto == NULL) {
crash_and_burn("icmp: unknown protocol");
}
p_proto = proto->p_proto;
}
#endif

/* create raw socket for ICMP calls (ping) */
*socktype = SOCK_RAW;
s = socket(AF_INET, *socktype, proto->p_proto);
s = socket(AF_INET, *socktype, p_proto);
if (s < 0) {
/* try non-privileged icmp (works on Mac OSX without privileges, for example) */
*socktype = SOCK_DGRAM;
s = socket(AF_INET, *socktype, proto->p_proto);
s = socket(AF_INET, *socktype, p_proto);
if (s < 0) {
return -1;
}
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21 changes: 14 additions & 7 deletions src/socket6.c
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Expand Up @@ -57,20 +57,27 @@ static int outgoing_src_addr_set_ipv6 = 0;

int open_ping_socket_ipv6(int *socktype)
{
struct protoent* proto;
int s;
int s = -1;
int p_proto = IPPROTO_ICMPV6;

/* confirm that ICMP6 is available on this machine */
if ((proto = getprotobyname("ipv6-icmp")) == NULL)
crash_and_burn("ipv6-icmp: unknown protocol");
#ifdef USE_GETPROTOBYNAME
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{
/* confirm that ICMP6 is available on this machine */
struct protoent* proto = getprotobyname("ipv6-icmp");
if (proto == NULL) {
crash_and_burn("ipv6-icmp: unknown protocol");
}
p_proto = proto->p_proto;
}
#endif

/* create raw socket for ICMP6 calls (ping) */
*socktype = SOCK_RAW;
s = socket(AF_INET6, *socktype, proto->p_proto);
s = socket(AF_INET6, *socktype, p_proto);
if (s < 0) {
/* try non-privileged icmp6 (works on Mac OSX without privileges, for example) */
*socktype = SOCK_DGRAM;
s = socket(AF_INET6, *socktype, proto->p_proto);
s = socket(AF_INET6, *socktype, p_proto);
if (s < 0) {
return -1;
}
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