From 3e55faa4bde6174d0a0ff2fb8051a67cb774fc99 Mon Sep 17 00:00:00 2001
From: Lorenz Stechauner <lorenz.stechauner@necronda.net>
Date: Mon, 1 Sep 2025 10:20:57 +0200
Subject: [PATCH] proj: Add server.c in perf

---
 proj/perf/.gitignore        |  6 ++++
 proj/perf/Makefile          |  7 ++--
 proj/perf/server.c          | 66 +++++++++++++++++++++++++++++++++++++
 proj/perf/test.sh           | 15 ++++++++-
 proj/server/src/performance | 45 +++++++++++++++++++++++++
 5 files changed, 136 insertions(+), 3 deletions(-)
 create mode 100644 proj/perf/.gitignore
 create mode 100644 proj/perf/server.c
 create mode 100755 proj/server/src/performance

diff --git a/proj/perf/.gitignore b/proj/perf/.gitignore
new file mode 100644
index 0000000..87554cd
--- /dev/null
+++ b/proj/perf/.gitignore
@@ -0,0 +1,6 @@
+main
+server
+*.csv
+*.txt
+*.log
+*.zip
diff --git a/proj/perf/Makefile b/proj/perf/Makefile
index ec3ec12..9cc02c1 100644
--- a/proj/perf/Makefile
+++ b/proj/perf/Makefile
@@ -4,13 +4,16 @@ CFLAGS=-std=c99 -pedantic -Wall -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_SVID_SOURCE -
 
 .PHONY: all clean
 all: default
-default: main
+default: main server
 
-main.o: main.c
+%.o: %.c
 	$(CC) -c -o $@ $^ $(CFLAGS)
 
 main: main.o
 	$(CC) -o $@ $^ $(CFLAGS) -lc
 
+server: server.o
+	$(CC) -o $@ $^ $(CFLAGS) -lc
+
 clean:
 	rm -rf main *.o
diff --git a/proj/perf/server.c b/proj/perf/server.c
new file mode 100644
index 0000000..b22b531
--- /dev/null
+++ b/proj/perf/server.c
@@ -0,0 +1,66 @@
+
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <stdlib.h>
+
+int main(const int argc, const char *argv[]) {
+    if (argc != 3) {
+        fprintf(stderr, "usage: server <path> <mode>\n");
+        return 1;
+    }
+
+    const char *path = argv[1];
+    const char *mode = argv[2];
+
+    int fd;
+    if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
+        fprintf(stderr, "unable to create socket: %s\n", strerror(errno));
+        return 1;
+    }
+
+    struct sockaddr_un addr = {.sun_family = AF_UNIX};
+    strcpy(addr.sun_path, path);
+    if (bind(fd, (struct sockaddr *) &addr, sizeof(addr)) != 0) {
+        fprintf(stderr, "unable to bind socket: %s\n", strerror(errno));
+        close(fd);
+        return 1;
+    }
+
+    if (listen(fd, 4) != 0) {
+        fprintf(stderr, "unable to listen on socket: %s\n", strerror(errno));
+        close(fd);
+        return 1;
+    }
+
+    size_t len = 4096;
+    char *line = malloc(len);
+    while (1) {
+        int client_fd;
+        if ((client_fd = accept(fd, NULL, NULL)) == -1) {
+            fprintf(stderr, "unable to accept connection: %s\n", strerror(errno));
+            break;
+        }
+
+        FILE *client;
+        if ((client = fdopen(client_fd, "w+")) == NULL) {
+            fprintf(stderr, "unable open stream: %s\n", strerror(errno));
+            break;
+        }
+
+        int n = 0;
+        while (getline(&line, &len, client) > 0) {
+            if (n % 2 == 1) {
+                fprintf(client, "%s\n", mode);
+            }
+            n++;
+        }
+    }
+
+    free(line);
+    close(fd);
+    unlink(path);
+}
diff --git a/proj/perf/test.sh b/proj/perf/test.sh
index e98cd13..9642caf 100755
--- a/proj/perf/test.sh
+++ b/proj/perf/test.sh
@@ -14,9 +14,22 @@ function test() {
   done
 }
 
+rm /tmp/test.ok.sock /tmp/test.return.sock /tmp/intercept.performance.ok.sock /tmp/intercept.performance.return.sock
+./server /tmp/test.ok.sock 'ok' &
+./server /tmp/test.return.sock 'return 0' &
+
 test ./main
 cd ../intercept
 test ./intercept -o -i - -- ../perf/main
 test ./intercept -o -i stderr -- ../perf/main
 test ./intercept -o -i file:out.log -- ../perf/main
-#test ./intercept -o -i unix:/ -- ../perf/main
+
+cd ../server/src
+./performance -m ok &
+./performance -m return &
+cd ../../intercept
+sleep 1
+test ./intercept -o -i unix:/tmp/test.ok.sock -- ../perf/main
+test ./intercept -o -i unix:/tmp/test.return.sock -- ../perf/main
+test ./intercept -o -i unix:/tmp/intercept.performance.ok.sock -- ../perf/main
+test ./intercept -o -i unix:/tmp/intercept.performance.return.sock -- ../perf/main
diff --git a/proj/server/src/performance b/proj/server/src/performance
new file mode 100755
index 0000000..c51eb26
--- /dev/null
+++ b/proj/server/src/performance
@@ -0,0 +1,45 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+# File: performance
+# Author: Lorenz Stechauner <e12119052@student.tuwien.ac.at>
+#         Lorenz Stechauner <lorenz.stechauner@necronda.net>
+
+import argparse
+
+import intercept
+import intercept.standard
+
+
+MODE: str
+
+
+class Handler(intercept.standard.Handler):
+    def before_pipe(self, fildes_ptr: intercept.Pointer) -> str:
+        return 'return 0' if MODE == 'return' else 'ok'
+
+    def after_pipe(self, fildes_ptr: intercept.Pointer,
+                   ret_value: int, errno: str = None, fildes: list[int] = None) -> None:
+        pass
+
+    def before_close(self, fildes: int) -> str:
+        return 'return 0' if MODE == 'return' else 'ok'
+
+    def after_close(self, fildes: int,
+                    ret_value: int, errno: str = None) -> None:
+        pass
+
+
+def main() -> None:
+    global MODE
+    parser = argparse.ArgumentParser()
+    parser.add_argument('-m', '--mode', choices=['ok', 'return'])
+    args = parser.parse_args()
+    MODE = args.mode
+
+    socket_name = f'/tmp/intercept.performance.{MODE}.sock'
+    intercept.intercept(socket_name, Handler)
+
+
+if __name__ == '__main__':
+    main()