microsocks: backport upstream fixes

Fix segmentation fault with newer musl and improve throughput.

Signed-off-by: Tianling Shen <cnsztl@immortalwrt.org>

net/microsocks/Makefile

@@ -2,7 +2,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=microsocks
 PKG_VERSION:=1.0.4
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://codeload.github.com/rofl0r/microsocks/tar.gz/v$(PKG_VERSION)?

net/microsocks/patches/001-use-a-bigger-thread-stack-by-default.patch

@@ -0,0 +1,24 @@
+From c81760cc3f1b6db22c7c9694efe7f3be115c2caf Mon Sep 17 00:00:00 2001
+From: rofl0r <rofl0r@users.noreply.github.com>
+Date: Fri, 17 May 2024 14:38:16 +0000
+Subject: [PATCH] use a bigger thread stack by default
+
+apparently newer musl versions require more stack for the TCP-based
+DNS resolver.
+
+closes #73
+---
+ sockssrv.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/sockssrv.c
++++ b/sockssrv.c
+@@ -47,7 +47,7 @@
+ #endif
+ 
+ #ifdef PTHREAD_STACK_MIN
+-#define THREAD_STACK_SIZE MAX(8*1024, PTHREAD_STACK_MIN)
++#define THREAD_STACK_SIZE MAX(16*1024, PTHREAD_STACK_MIN)
+ #else
+ #define THREAD_STACK_SIZE 64*1024
+ #endif

net/microsocks/patches/002-mute-warning-about-shadow-declaration-of-bind_addr.patch

@@ -0,0 +1,22 @@
+From 0343813e0410b469d591bc61b9a546ee2c2c15f6 Mon Sep 17 00:00:00 2001
+From: rofl0r <rofl0r@users.noreply.github.com>
+Date: Fri, 17 May 2024 14:40:11 +0000
+Subject: [PATCH] mute warning about shadow declaration of bind_addr
+
+---
+ sockssrv.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+--- a/sockssrv.c
++++ b/sockssrv.c
+@@ -112,8 +112,8 @@ struct thread {
+ static void dolog(const char* fmt, ...) { }
+ #endif
+ 
+-static struct addrinfo* addr_choose(struct addrinfo* list, union sockaddr_union* bind_addr) {
+-	int af = SOCKADDR_UNION_AF(bind_addr);
++static struct addrinfo* addr_choose(struct addrinfo* list, union sockaddr_union* bindaddr) {
++	int af = SOCKADDR_UNION_AF(bindaddr);
+ 	if(af == AF_UNSPEC) return list;
+ 	struct addrinfo* p;
+ 	for(p=list; p; p=p->ai_next)

net/microsocks/patches/003-improve-throughput-in-copyloop-using-bigger-buffer.patch

@@ -0,0 +1,114 @@
+From 98421a21c4adc4c77c0cf3a5d650cc28ad3e0107 Mon Sep 17 00:00:00 2001
+From: rofl0r <rofl0r@users.noreply.github.com>
+Date: Fri, 24 May 2024 23:02:34 +0000
+Subject: [PATCH] improve throughput in copyloop() using bigger buffer
+
+- refactored clientthread to put the handshake code into its own
+  function, since it used its own 1K stack buffer.
+  by returning from the function before calling copyloop, we have
+  that space available in the new stackframe.
+- since getaddrinfo() was the main stack consumer in the entire
+  code, we can safely use at least half the available thread
+  stack size for the copyloop to achieve higher throughput.
+  in my testing with pyhttpd it turned out that 64k is the sweet
+  spot to have minimal syscall overhead, but 16k is very close,
+  and it allows us to keep the minimal memory usage profile.
+
+this is in response to https://github.com/rofl0r/microsocks/issues/58#issuecomment-2118389063
+which links to a repo that tests different socks5 servers
+performance on gigabit links.
+
+also closes #10
+---
+ sockssrv.c | 35 +++++++++++++++++++----------------
+ 1 file changed, 19 insertions(+), 16 deletions(-)
+
+--- a/sockssrv.c
++++ b/sockssrv.c
+@@ -44,6 +44,7 @@
+ 
+ #ifndef MAX
+ #define MAX(x, y) ((x) > (y) ? (x) : (y))
++#define MIN(x, y) ((x) < (y) ? (x) : (y))
+ #endif
+ 
+ #ifdef PTHREAD_STACK_MIN
+@@ -282,7 +283,10 @@ static void copyloop(int fd1, int fd2) {
+ 		}
+ 		int infd = (fds[0].revents & POLLIN) ? fd1 : fd2;
+ 		int outfd = infd == fd2 ? fd1 : fd2;
+-		char buf[1024];
++		/* since the biggest stack consumer in the entire code is
++		   libc's getaddrinfo(), we can safely use at least half the
++		   available stacksize to improve throughput. */
++		char buf[MIN(16*1024, THREAD_STACK_SIZE/2)];
+ 		ssize_t sent = 0, n = read(infd, buf, sizeof buf);
+ 		if(n <= 0) return;
+ 		while(sent < n) {
+@@ -310,14 +314,12 @@ static enum errorcode check_credentials(
+ 	return EC_NOT_ALLOWED;
+ }
+ 
+-static void* clientthread(void *data) {
+-	struct thread *t = data;
+-	t->state = SS_1_CONNECTED;
++static int handshake(struct thread *t) {
+ 	unsigned char buf[1024];
+ 	ssize_t n;
+ 	int ret;
+-	int remotefd = -1;
+ 	enum authmethod am;
++	t->state = SS_1_CONNECTED;
+ 	while((n = recv(t->client.fd, buf, sizeof buf, 0)) > 0) {
+ 		switch(t->state) {
+ 			case SS_1_CONNECTED:
+@@ -325,13 +327,13 @@ static void* clientthread(void *data) {
+ 				if(am == AM_NO_AUTH) t->state = SS_3_AUTHED;
+ 				else if (am == AM_USERNAME) t->state = SS_2_NEED_AUTH;
+ 				send_auth_response(t->client.fd, 5, am);
+-				if(am == AM_INVALID) goto breakloop;
++				if(am == AM_INVALID) return -1;
+ 				break;
+ 			case SS_2_NEED_AUTH:
+ 				ret = check_credentials(buf, n);
+ 				send_auth_response(t->client.fd, 1, ret);
+ 				if(ret != EC_SUCCESS)
+-					goto breakloop;
++					return -1;
+ 				t->state = SS_3_AUTHED;
+ 				if(auth_ips && !pthread_rwlock_wrlock(&auth_ips_lock)) {
+ 					if(!is_in_authed_list(&t->client.addr))
+@@ -343,23 +345,24 @@ static void* clientthread(void *data) {
+ 				ret = connect_socks_target(buf, n, &t->client);
+ 				if(ret < 0) {
+ 					send_error(t->client.fd, ret*-1);
+-					goto breakloop;
++					return -1;
+ 				}
+-				remotefd = ret;
+ 				send_error(t->client.fd, EC_SUCCESS);
+-				copyloop(t->client.fd, remotefd);
+-				goto breakloop;
+-
++				return ret;
+ 		}
+ 	}
+-breakloop:
++	return -1;
++}
+ 
+-	if(remotefd != -1)
++static void* clientthread(void *data) {
++	struct thread *t = data;
++	int remotefd = handshake(t);
++	if(remotefd != -1) {
++		copyloop(t->client.fd, remotefd);
+ 		close(remotefd);
+-
++	}
+ 	close(t->client.fd);
+ 	t->done = 1;
+-
+ 	return 0;
+ }
+