Disable setsockopt(IPV6_V6ONLY)
I love mapped addresses, and some bad software (lighttpd) believes I'm wrong - in fact, the only config key they let me change is whether or not it'll call setsockopt(IPV6_V6ONLY, true). disabling that config doesn't explicitly set IPV6_V6ONLY to false.
To make everyone happy, I'd like to disable the program's ability to setsockopt(IPV6_V6ONLY), while keeping /proc/sys/net/ipv6/bindv6only as 0.
Is there any way to do this in plain old linux?
linux ipv6 ipv4
asked Jan 28 at 17:17
SoniEx2SoniEx2
1058
add a comment |
I love mapped addresses, and some bad software (lighttpd) believes I'm wrong - in fact, the only config key they let me change is whether or not it'll call setsockopt(IPV6_V6ONLY, true). disabling that config doesn't explicitly set IPV6_V6ONLY to false.
To make everyone happy, I'd like to disable the program's ability to setsockopt(IPV6_V6ONLY), while keeping /proc/sys/net/ipv6/bindv6only as 0.
Is there any way to do this in plain old linux?
linux ipv6 ipv4
asked Jan 28 at 17:17
SoniEx2SoniEx2
1058
add a comment |
I love mapped addresses, and some bad software (lighttpd) believes I'm wrong - in fact, the only config key they let me change is whether or not it'll call setsockopt(IPV6_V6ONLY, true). disabling that config doesn't explicitly set IPV6_V6ONLY to false.
To make everyone happy, I'd like to disable the program's ability to setsockopt(IPV6_V6ONLY), while keeping /proc/sys/net/ipv6/bindv6only as 0.
Is there any way to do this in plain old linux?
linux ipv6 ipv4
asked Jan 28 at 17:17
SoniEx2SoniEx2
1058
I love mapped addresses, and some bad software (lighttpd) believes I'm wrong - in fact, the only config key they let me change is whether or not it'll call setsockopt(IPV6_V6ONLY, true). disabling that config doesn't explicitly set IPV6_V6ONLY to false.
To make everyone happy, I'd like to disable the program's ability to setsockopt(IPV6_V6ONLY), while keeping /proc/sys/net/ipv6/bindv6only as 0.
Is there any way to do this in plain old linux?
linux ipv6 ipv4
linux ipv6 ipv4
asked Jan 28 at 17:17
SoniEx2SoniEx2
1058
asked Jan 28 at 17:17
SoniEx2SoniEx2
1058
asked Jan 28 at 17:17
SoniEx2SoniEx2
1058
asked Jan 28 at 17:17
SoniEx2SoniEx2
1058
asked Jan 28 at 17:17
SoniEx2SoniEx2
1058
1058
add a comment |
add a comment |
1 Answer
1
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Since most programs make such calls through libc, use $LD_PRELOAD to intercept them:
Write a shared library (a .so file) that provides your own implementation of
setsockopt().
In your implementation, you can check the parameters and call the original function, or don't. (Use
dlsym(RTLD_NEXT, …)to get a pointer to the "original" function so that you can call it.)
int frob(const char *path) {
static int (*real_frob)(const char *);
if (!real_frob)
real_frob = dlsym(RTLD_NEXT, "frob");
return real_frob(path);
}
After compiling the .c file into a .so, set the $LD_PRELOAD environment variable for the daemon to your new library's path.
answered Jan 28 at 18:32
grawitygrawity
238k37505560
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Since most programs make such calls through libc, use $LD_PRELOAD to intercept them:
Write a shared library (a .so file) that provides your own implementation of
setsockopt().
In your implementation, you can check the parameters and call the original function, or don't. (Use
dlsym(RTLD_NEXT, …)to get a pointer to the "original" function so that you can call it.)
int frob(const char *path) {
static int (*real_frob)(const char *);
if (!real_frob)
real_frob = dlsym(RTLD_NEXT, "frob");
return real_frob(path);
}
After compiling the .c file into a .so, set the $LD_PRELOAD environment variable for the daemon to your new library's path.
answered Jan 28 at 18:32
grawitygrawity
238k37505560
add a comment |
Since most programs make such calls through libc, use $LD_PRELOAD to intercept them:
Write a shared library (a .so file) that provides your own implementation of
setsockopt().
In your implementation, you can check the parameters and call the original function, or don't. (Use
dlsym(RTLD_NEXT, …)to get a pointer to the "original" function so that you can call it.)
int frob(const char *path) {
static int (*real_frob)(const char *);
if (!real_frob)
real_frob = dlsym(RTLD_NEXT, "frob");
return real_frob(path);
}
After compiling the .c file into a .so, set the $LD_PRELOAD environment variable for the daemon to your new library's path.
answered Jan 28 at 18:32
grawitygrawity
238k37505560
add a comment |
Since most programs make such calls through libc, use $LD_PRELOAD to intercept them:
Write a shared library (a .so file) that provides your own implementation of
setsockopt().
In your implementation, you can check the parameters and call the original function, or don't. (Use
dlsym(RTLD_NEXT, …)to get a pointer to the "original" function so that you can call it.)
int frob(const char *path) {
static int (*real_frob)(const char *);
if (!real_frob)
real_frob = dlsym(RTLD_NEXT, "frob");
return real_frob(path);
}
After compiling the .c file into a .so, set the $LD_PRELOAD environment variable for the daemon to your new library's path.
answered Jan 28 at 18:32
grawitygrawity
238k37505560
Since most programs make such calls through libc, use $LD_PRELOAD to intercept them:
Write a shared library (a .so file) that provides your own implementation of
setsockopt().
In your implementation, you can check the parameters and call the original function, or don't. (Use
dlsym(RTLD_NEXT, …)to get a pointer to the "original" function so that you can call it.)
int frob(const char *path) {
static int (*real_frob)(const char *);
if (!real_frob)
real_frob = dlsym(RTLD_NEXT, "frob");
return real_frob(path);
}
After compiling the .c file into a .so, set the $LD_PRELOAD environment variable for the daemon to your new library's path.
answered Jan 28 at 18:32
grawitygrawity
238k37505560
answered Jan 28 at 18:32
grawitygrawity
238k37505560
answered Jan 28 at 18:32
grawitygrawity
238k37505560
answered Jan 28 at 18:32
grawitygrawity
238k37505560
238k37505560
add a comment |
add a comment |
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