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-rw-r--r--.gitignore4
-rw-r--r--LICENSE428
-rw-r--r--Makefile45
-rw-r--r--README.md29
-rw-r--r--client/main.c18
-rw-r--r--server/main.c18
-rw-r--r--shared/hook.c128
-rw-r--r--shared/hook.h32
8 files changed, 702 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..62e2ebd
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+client_example
+server_example
+*.so
+*.o \ No newline at end of file
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..2d58298
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,428 @@
+Attribution-ShareAlike 4.0 International
+
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diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..ef37426
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,45 @@
+.PHONY: server client shared install
+
+# > configuration start
+
+lib_name := som_net
+
+CC = gcc
+CFLAGS = -I. -g -Wall -Werror -Wextra
+LD_FLAGS = -L.
+
+# < configuration end
+
+.SOURCES := $(wildcard $(MAKECMDGOALS)/*.c)
+.OBJECTS := $(patsubst $(MAKECMDGOALS)/%.c,$(MAKECMDGOALS)/%.o,$(.SOURCES))
+
+SHARED_LD = -shared -fPIC
+CLIENT_LD = -l${lib_name}
+SERVER_LD = -l${lib_name}
+
+export LD_LIBRARY_PATH:=`pwd`
+# help text
+default:
+ @echo " make targets: shared, client, server, [install >WIP<]"
+ @echo " *shared is required for all targets!"
+
+# target: client
+client: .client_comp
+.client_comp: $(.OBJECTS)
+ $(CC) ${LD_FLAGS} ${CFLAGS} -o client_example ${.OBJECTS} ${CLIENT_LD}
+
+# target: server
+server: .server_comp
+.server_comp: $(.OBJECTS)
+ $(CC) ${LD_FLAGS} ${CFLAGS} -o server_example ${.OBJECTS} ${SERVER_LD}
+
+# target: shared
+shared: .shared_comp
+.shared_comp: $(.OBJECTS)
+ $(CC) ${LD_FLAGS} ${SHARED_LD} ${CFLAGS} -o lib${lib_name}.so ${.OBJECTS}
+
+clean:
+ rm -f $(wildcard ./**/*.o) client_example server_example lib${lib_name}.so
+
+**/%.o: **/%.c
+ $(CC) -c -o $@ $<
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..f0bcb3d
--- /dev/null
+++ b/README.md
@@ -0,0 +1,29 @@
+# Simple Library Example
+- Author: jak1
+
+## Build
+- `make shared` (required for all targets, also mentioned when you just do `make`) (shared object)
+- `make client` builds the client_example (elf)
+- `make server` builds the server_example (elf)
+- `make install` (not implemented, i dont want to install any librarys that are just examples)
+
+## Test it
+the client needs a running server, so start with it first.\
+- `./server_example`
+
+then execute the client
+
+- `./client_example`
+
+## Troubleshooting
+in case you get an error like: `error while loading shared libraries: libsom_net.so: cannot open shared object file: No such file or directory`\
+there are 2 options:
+- updated your ldconfig
+or
+- start the binarys like this:
+ - ```LD_LIBRARY_PATH=`pwd` ./server_example```
+ - ```LD_LIBRARY_PATH=`pwd` ./client_example```
+
+## Copyright CC BY-SA 4.0
+so feel free to edit publish or make money with it, as long as u keep my name in it :)\
+you could even print it on toilet paper if you dislike it that hard... \ No newline at end of file
diff --git a/client/main.c b/client/main.c
new file mode 100644
index 0000000..c58191c
--- /dev/null
+++ b/client/main.c
@@ -0,0 +1,18 @@
+/*
+ * som_net / simple library example (c) by jak1
+ *
+ * som_net / simple library example is licensed under a
+ * Creative Commons Attribution-ShareAlike 4.0 International License.
+ *
+ * You should have received a copy of the license along with this
+ * work. If not, see <http://creativecommons.org/licenses/by-sa/4.0/>.
+ * Footer
+*/
+
+#include "../shared/hook.h"
+
+int main(void)
+{
+ start_chat(1);
+ return 0;
+}
diff --git a/server/main.c b/server/main.c
new file mode 100644
index 0000000..35ff02d
--- /dev/null
+++ b/server/main.c
@@ -0,0 +1,18 @@
+/*
+ * som_net / simple library example (c) by jak1
+ *
+ * som_net / simple library example is licensed under a
+ * Creative Commons Attribution-ShareAlike 4.0 International License.
+ *
+ * You should have received a copy of the license along with this
+ * work. If not, see <http://creativecommons.org/licenses/by-sa/4.0/>.
+ * Footer
+*/
+
+#include "../shared/hook.h"
+
+int main(void)
+{
+ start_chat(0);
+ return 0;
+}
diff --git a/shared/hook.c b/shared/hook.c
new file mode 100644
index 0000000..fd6ce2b
--- /dev/null
+++ b/shared/hook.c
@@ -0,0 +1,128 @@
+/*
+ * som_net / simple library example (c) by jak1
+ *
+ * som_net / simple library example is licensed under a
+ * Creative Commons Attribution-ShareAlike 4.0 International License.
+ *
+ * You should have received a copy of the license along with this
+ * work. If not, see <http://creativecommons.org/licenses/by-sa/4.0/>.
+ * Footer
+*/
+
+#include "hook.h"
+
+void chat(int is_client, int sockfd)
+{
+ char buff[MAX_BUFFER_SIZE];
+ int n;
+ if (is_client){
+ for (;;) {
+ bzero(buff, sizeof(buff));
+ printf("Enter the string : ");
+ n = 0;
+ while ((buff[n++] = getchar()) != '\n')
+ ;
+ write(sockfd, buff, sizeof(buff));
+ bzero(buff, sizeof(buff));
+ read(sockfd, buff, sizeof(buff));
+ printf("From Server : %s", buff);
+ if ((strncmp(buff, "exit", 4)) == 0) {
+ printf("Client Exit...\n");
+ break;
+ }
+ }
+ }
+ else
+ {
+ for (;;) {
+ bzero(buff, MAX_BUFFER_SIZE);
+ read(sockfd, buff, sizeof(buff));
+ printf("From client: %s\t To client : ", buff);
+ bzero(buff, MAX_BUFFER_SIZE);
+ n = 0;
+ while ((buff[n++] = getchar()) != '\n')
+ ;
+ write(sockfd, buff, sizeof(buff));
+ if (strncmp("exit", buff, 4) == 0) {
+ printf("Server Exit...\n");
+ break;
+ }
+ }
+ }
+}
+
+int start_chat( int is_client )
+{
+ int sockfd, connfd;
+ socklen_t len;
+ struct sockaddr_in servaddr, cli;
+ sockfd = socket(AF_INET, SOCK_STREAM, 0);
+ if (is_client)
+ {
+ if (sockfd == -1) {
+ printf("socket creation failed...\n");
+ exit(0);
+ }
+ else
+ printf("Socket successfully created..\n");
+ bzero(&servaddr, sizeof(servaddr));
+
+ servaddr.sin_family = AF_INET;
+ servaddr.sin_addr.s_addr = inet_addr("127.0.0.1");
+ servaddr.sin_port = htons(PORT);
+
+ if (connect(sockfd, (SA*)&servaddr, sizeof(servaddr))
+ != 0) {
+ printf("connection with the server failed...\n");
+ exit(0);
+ }
+ else
+ printf("connected to the server..\n");
+
+ chat(is_client, sockfd);
+
+ close(sockfd);
+ }
+ else
+ {
+ if (sockfd == -1) {
+ printf("socket creation failed...\n");
+ exit(0);
+ }
+ else
+ printf("Socket successfully created..\n");
+ bzero(&servaddr, sizeof(servaddr));
+
+ servaddr.sin_family = AF_INET;
+ servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
+ servaddr.sin_port = htons(PORT);
+
+ if ((bind(sockfd, (SA*)&servaddr, sizeof(servaddr))) != 0) {
+ printf("socket bind failed...\n");
+ exit(0);
+ }
+ else
+ printf("Socket successfully binded..\n");
+
+ if ((listen(sockfd, 5)) != 0) {
+ printf("Listen failed...\n");
+ exit(0);
+ }
+ else
+ printf("Server listening..\n");
+ len = sizeof(cli);
+
+ connfd = accept(sockfd, (SA*)&cli, &len);
+ if (connfd < 0) {
+ printf("server accept failed...\n");
+ exit(0);
+ }
+ else
+ printf("server accept the client...\n");
+
+ chat(is_client, connfd);
+
+ close(sockfd);
+ }
+ return 0;
+}
diff --git a/shared/hook.h b/shared/hook.h
new file mode 100644
index 0000000..8f20565
--- /dev/null
+++ b/shared/hook.h
@@ -0,0 +1,32 @@
+/*
+ * som_net / simple library example (c) by jak1
+ *
+ * som_net / simple library example is licensed under a
+ * Creative Commons Attribution-ShareAlike 4.0 International License.
+ *
+ * You should have received a copy of the license along with this
+ * work. If not, see <http://creativecommons.org/licenses/by-sa/4.0/>.
+ * Footer
+*/
+
+#ifndef SHARED_HOOK_H
+#define SHARED_HOOK_H
+ #include <arpa/inet.h> // inet_addr()
+ #include <strings.h>
+ #include <stdio.h>
+ #include <stdbool.h>
+ #include <netdb.h>
+ #include <netinet/in.h>
+ #include <stdlib.h>
+ #include <string.h>
+ #include <sys/socket.h>
+ #include <sys/types.h>
+ #include <unistd.h> // read(), write(), close()
+
+ #define MAX_BUFFER_SIZE 80
+ #define PORT 50501
+ #define SA struct sockaddr
+
+ int start_chat(int is_client);
+
+#endif // SHARED_HOOK_H