init lib example repo

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
+
+=======================================================================
+
+Creative Commons Corporation ("Creative Commons") is not a law firm and
+does not provide legal services or legal advice. Distribution of
+Creative Commons public licenses does not create a lawyer-client or
+other relationship. Creative Commons makes its licenses and related
+information available on an "as-is" basis. Creative Commons gives no
+warranties regarding its licenses, any material licensed under their
+terms and conditions, or any related information. Creative Commons
+disclaims all liability for damages resulting from their use to the
+fullest extent possible.
+
+Using Creative Commons Public Licenses
+
+Creative Commons public licenses provide a standard set of terms and
+conditions that creators and other rights holders may use to share
+original works of authorship and other material subject to copyright
+and certain other rights specified in the public license below. The
+following considerations are for informational purposes only, are not
+exhaustive, and do not form part of our licenses.
+
+     Considerations for licensors: Our public licenses are
+     intended for use by those authorized to give the public
+     permission to use material in ways otherwise restricted by
+     copyright and certain other rights. Our licenses are
+     irrevocable. Licensors should read and understand the terms
+     and conditions of the license they choose before applying it.
+     Licensors should also secure all rights necessary before
+     applying our licenses so that the public can reuse the
+     material as expected. Licensors should clearly mark any
+     material not subject to the license. This includes other CC-
+     licensed material, or material used under an exception or
+     limitation to copyright. More considerations for licensors:
+    wiki.creativecommons.org/Considerations_for_licensors
+
+     Considerations for the public: By using one of our public
+     licenses, a licensor grants the public permission to use the
+     licensed material under specified terms and conditions. If
+     the licensor's permission is not necessary for any reason--for
+     example, because of any applicable exception or limitation to
+     copyright--then that use is not regulated by the license. Our
+     licenses grant only permissions under copyright and certain
+     other rights that a licensor has authority to grant. Use of
+     the licensed material may still be restricted for other
+     reasons, including because others have copyright or other
+     rights in the material. A licensor may make special requests,
+     such as asking that all changes be marked or described.
+     Although not required by our licenses, you are encouraged to
+     respect those requests where reasonable. More considerations
+     for the public:
+    wiki.creativecommons.org/Considerations_for_licensees
+
+=======================================================================
+
+Creative Commons Attribution-ShareAlike 4.0 International Public
+License
+
+By exercising the Licensed Rights (defined below), You accept and agree
+to be bound by the terms and conditions of this Creative Commons
+Attribution-ShareAlike 4.0 International Public License ("Public
+License"). To the extent this Public License may be interpreted as a
+contract, You are granted the Licensed Rights in consideration of Your
+acceptance of these terms and conditions, and the Licensor grants You
+such rights in consideration of benefits the Licensor receives from
+making the Licensed Material available under these terms and
+conditions.
+
+
+Section 1 -- Definitions.
+
+  a. Adapted Material means material subject to Copyright and Similar
+     Rights that is derived from or based upon the Licensed Material
+     and in which the Licensed Material is translated, altered,
+     arranged, transformed, or otherwise modified in a manner requiring
+     permission under the Copyright and Similar Rights held by the
+     Licensor. For purposes of this Public License, where the Licensed
+     Material is a musical work, performance, or sound recording,
+     Adapted Material is always produced where the Licensed Material is
+     synched in timed relation with a moving image.
+
+  b. Adapter's License means the license You apply to Your Copyright
+     and Similar Rights in Your contributions to Adapted Material in
+     accordance with the terms and conditions of this Public License.
+
+  c. BY-SA Compatible License means a license listed at
+     creativecommons.org/compatiblelicenses, approved by Creative
+     Commons as essentially the equivalent of this Public License.
+
+  d. Copyright and Similar Rights means copyright and/or similar rights
+     closely related to copyright including, without limitation,
+     performance, broadcast, sound recording, and Sui Generis Database
+     Rights, without regard to how the rights are labeled or
+     categorized. For purposes of this Public License, the rights
+     specified in Section 2(b)(1)-(2) are not Copyright and Similar
+     Rights.
+
+  e. Effective Technological Measures means those measures that, in the
+     absence of proper authority, may not be circumvented under laws
+     fulfilling obligations under Article 11 of the WIPO Copyright
+     Treaty adopted on December 20, 1996, and/or similar international
+     agreements.
+
+  f. Exceptions and Limitations means fair use, fair dealing, and/or
+     any other exception or limitation to Copyright and Similar Rights
+     that applies to Your use of the Licensed Material.
+
+  g. License Elements means the license attributes listed in the name
+     of a Creative Commons Public License. The License Elements of this
+     Public License are Attribution and ShareAlike.
+
+  h. Licensed Material means the artistic or literary work, database,
+     or other material to which the Licensor applied this Public
+     License.
+
+  i. Licensed Rights means the rights granted to You subject to the
+     terms and conditions of this Public License, which are limited to
+     all Copyright and Similar Rights that apply to Your use of the
+     Licensed Material and that the Licensor has authority to license.
+
+  j. Licensor means the individual(s) or entity(ies) granting rights
+     under this Public License.
+
+  k. Share means to provide material to the public by any means or
+     process that requires permission under the Licensed Rights, such
+     as reproduction, public display, public performance, distribution,
+     dissemination, communication, or importation, and to make material
+     available to the public including in ways that members of the
+     public may access the material from a place and at a time
+     individually chosen by them.
+
+  l. Sui Generis Database Rights means rights other than copyright
+     resulting from Directive 96/9/EC of the European Parliament and of
+     the Council of 11 March 1996 on the legal protection of databases,
+     as amended and/or succeeded, as well as other essentially
+     equivalent rights anywhere in the world.
+
+  m. You means the individual or entity exercising the Licensed Rights
+     under this Public License. Your has a corresponding meaning.
+
+
+Section 2 -- Scope.
+
+  a. License grant.
+
+       1. Subject to the terms and conditions of this Public License,
+          the Licensor hereby grants You a worldwide, royalty-free,
+          non-sublicensable, non-exclusive, irrevocable license to
+          exercise the Licensed Rights in the Licensed Material to:
+
+            a. reproduce and Share the Licensed Material, in whole or
+               in part; and
+
+            b. produce, reproduce, and Share Adapted Material.
+
+       2. Exceptions and Limitations. For the avoidance of doubt, where
+          Exceptions and Limitations apply to Your use, this Public
+          License does not apply, and You do not need to comply with
+          its terms and conditions.
+
+       3. Term. The term of this Public License is specified in Section
+          6(a).
+
+       4. Media and formats; technical modifications allowed. The
+          Licensor authorizes You to exercise the Licensed Rights in
+          all media and formats whether now known or hereafter created,
+          and to make technical modifications necessary to do so. The
+          Licensor waives and/or agrees not to assert any right or
+          authority to forbid You from making technical modifications
+          necessary to exercise the Licensed Rights, including
+          technical modifications necessary to circumvent Effective
+          Technological Measures. For purposes of this Public License,
+          simply making modifications authorized by this Section 2(a)
+          (4) never produces Adapted Material.
+
+       5. Downstream recipients.
+
+            a. Offer from the Licensor -- Licensed Material. Every
+               recipient of the Licensed Material automatically
+               receives an offer from the Licensor to exercise the
+               Licensed Rights under the terms and conditions of this
+               Public License.
+
+            b. Additional offer from the Licensor -- Adapted Material.
+               Every recipient of Adapted Material from You
+               automatically receives an offer from the Licensor to
+               exercise the Licensed Rights in the Adapted Material
+               under the conditions of the Adapter's License You apply.
+
+            c. No downstream restrictions. You may not offer or impose
+               any additional or different terms or conditions on, or
+               apply any Effective Technological Measures to, the
+               Licensed Material if doing so restricts exercise of the
+               Licensed Rights by any recipient of the Licensed
+               Material.
+
+       6. No endorsement. Nothing in this Public License constitutes or
+          may be construed as permission to assert or imply that You
+          are, or that Your use of the Licensed Material is, connected
+          with, or sponsored, endorsed, or granted official status by,
+          the Licensor or others designated to receive attribution as
+          provided in Section 3(a)(1)(A)(i).
+
+  b. Other rights.
+
+       1. Moral rights, such as the right of integrity, are not
+          licensed under this Public License, nor are publicity,
+          privacy, and/or other similar personality rights; however, to
+          the extent possible, the Licensor waives and/or agrees not to
+          assert any such rights held by the Licensor to the limited
+          extent necessary to allow You to exercise the Licensed
+          Rights, but not otherwise.
+
+       2. Patent and trademark rights are not licensed under this
+          Public License.
+
+       3. To the extent possible, the Licensor waives any right to
+          collect royalties from You for the exercise of the Licensed
+          Rights, whether directly or through a collecting society
+          under any voluntary or waivable statutory or compulsory
+          licensing scheme. In all other cases the Licensor expressly
+          reserves any right to collect such royalties.
+
+
+Section 3 -- License Conditions.
+
+Your exercise of the Licensed Rights is expressly made subject to the
+following conditions.
+
+  a. Attribution.
+
+       1. If You Share the Licensed Material (including in modified
+          form), You must:
+
+            a. retain the following if it is supplied by the Licensor
+               with the Licensed Material:
+
+                 i. identification of the creator(s) of the Licensed
+                    Material and any others designated to receive
+                    attribution, in any reasonable manner requested by
+                    the Licensor (including by pseudonym if
+                    designated);
+
+                ii. a copyright notice;
+
+               iii. a notice that refers to this Public License;
+
+                iv. a notice that refers to the disclaimer of
+                    warranties;
+
+                 v. a URI or hyperlink to the Licensed Material to the
+                    extent reasonably practicable;
+
+            b. indicate if You modified the Licensed Material and
+               retain an indication of any previous modifications; and
+
+            c. indicate the Licensed Material is licensed under this
+               Public License, and include the text of, or the URI or
+               hyperlink to, this Public License.
+
+       2. You may satisfy the conditions in Section 3(a)(1) in any
+          reasonable manner based on the medium, means, and context in
+          which You Share the Licensed Material. For example, it may be
+          reasonable to satisfy the conditions by providing a URI or
+          hyperlink to a resource that includes the required
+          information.
+
+       3. If requested by the Licensor, You must remove any of the
+          information required by Section 3(a)(1)(A) to the extent
+          reasonably practicable.
+
+  b. ShareAlike.
+
+     In addition to the conditions in Section 3(a), if You Share
+     Adapted Material You produce, the following conditions also apply.
+
+       1. The Adapter's License You apply must be a Creative Commons
+          license with the same License Elements, this version or
+          later, or a BY-SA Compatible License.
+
+       2. You must include the text of, or the URI or hyperlink to, the
+          Adapter's License You apply. You may satisfy this condition
+          in any reasonable manner based on the medium, means, and
+          context in which You Share Adapted Material.
+
+       3. You may not offer or impose any additional or different terms
+          or conditions on, or apply any Effective Technological
+          Measures to, Adapted Material that restrict exercise of the
+          rights granted under the Adapter's License You apply.
+
+
+Section 4 -- Sui Generis Database Rights.
+
+Where the Licensed Rights include Sui Generis Database Rights that
+apply to Your use of the Licensed Material:
+
+  a. for the avoidance of doubt, Section 2(a)(1) grants You the right
+     to extract, reuse, reproduce, and Share all or a substantial
+     portion of the contents of the database;
+
+  b. if You include all or a substantial portion of the database
+     contents in a database in which You have Sui Generis Database
+     Rights, then the database in which You have Sui Generis Database
+     Rights (but not its individual contents) is Adapted Material,
+     including for purposes of Section 3(b); and
+
+  c. You must comply with the conditions in Section 3(a) if You Share
+     all or a substantial portion of the contents of the database.
+
+For the avoidance of doubt, this Section 4 supplements and does not
+replace Your obligations under this Public License where the Licensed
+Rights include other Copyright and Similar Rights.
+
+
+Section 5 -- Disclaimer of Warranties and Limitation of Liability.
+
+  a. UNLESS OTHERWISE SEPARATELY UNDERTAKEN BY THE LICENSOR, TO THE
+     EXTENT POSSIBLE, THE LICENSOR OFFERS THE LICENSED MATERIAL AS-IS
+     AND AS-AVAILABLE, AND MAKES NO REPRESENTATIONS OR WARRANTIES OF
+     ANY KIND CONCERNING THE LICENSED MATERIAL, WHETHER EXPRESS,
+     IMPLIED, STATUTORY, OR OTHER. THIS INCLUDES, WITHOUT LIMITATION,
+     WARRANTIES OF TITLE, MERCHANTABILITY, FITNESS FOR A PARTICULAR
+     PURPOSE, NON-INFRINGEMENT, ABSENCE OF LATENT OR OTHER DEFECTS,
+     ACCURACY, OR THE PRESENCE OR ABSENCE OF ERRORS, WHETHER OR NOT
+     KNOWN OR DISCOVERABLE. WHERE DISCLAIMERS OF WARRANTIES ARE NOT
+     ALLOWED IN FULL OR IN PART, THIS DISCLAIMER MAY NOT APPLY TO YOU.
+
+  b. TO THE EXTENT POSSIBLE, IN NO EVENT WILL THE LICENSOR BE LIABLE
+     TO YOU ON ANY LEGAL THEORY (INCLUDING, WITHOUT LIMITATION,
+     NEGLIGENCE) OR OTHERWISE FOR ANY DIRECT, SPECIAL, INDIRECT,
+     INCIDENTAL, CONSEQUENTIAL, PUNITIVE, EXEMPLARY, OR OTHER LOSSES,
+     COSTS, EXPENSES, OR DAMAGES ARISING OUT OF THIS PUBLIC LICENSE OR
+     USE OF THE LICENSED MATERIAL, EVEN IF THE LICENSOR HAS BEEN
+     ADVISED OF THE POSSIBILITY OF SUCH LOSSES, COSTS, EXPENSES, OR
+     DAMAGES. WHERE A LIMITATION OF LIABILITY IS NOT ALLOWED IN FULL OR
+     IN PART, THIS LIMITATION MAY NOT APPLY TO YOU.
+
+  c. The disclaimer of warranties and limitation of liability provided
+     above shall be interpreted in a manner that, to the extent
+     possible, most closely approximates an absolute disclaimer and
+     waiver of all liability.
+
+
+Section 6 -- Term and Termination.
+
+  a. This Public License applies for the term of the Copyright and
+     Similar Rights licensed here. However, if You fail to comply with
+     this Public License, then Your rights under this Public License
+     terminate automatically.
+
+  b. Where Your right to use the Licensed Material has terminated under
+     Section 6(a), it reinstates:
+
+       1. automatically as of the date the violation is cured, provided
+          it is cured within 30 days of Your discovery of the
+          violation; or
+
+       2. upon express reinstatement by the Licensor.
+
+     For the avoidance of doubt, this Section 6(b) does not affect any
+     right the Licensor may have to seek remedies for Your violations
+     of this Public License.
+
+  c. For the avoidance of doubt, the Licensor may also offer the
+     Licensed Material under separate terms or conditions or stop
+     distributing the Licensed Material at any time; however, doing so
+     will not terminate this Public License.
+
+  d. Sections 1, 5, 6, 7, and 8 survive termination of this Public
+     License.
+
+
+Section 7 -- Other Terms and Conditions.
+
+  a. The Licensor shall not be bound by any additional or different
+     terms or conditions communicated by You unless expressly agreed.
+
+  b. Any arrangements, understandings, or agreements regarding the
+     Licensed Material not stated herein are separate from and
+     independent of the terms and conditions of this Public License.
+
+
+Section 8 -- Interpretation.
+
+  a. For the avoidance of doubt, this Public License does not, and
+     shall not be interpreted to, reduce, limit, restrict, or impose
+     conditions on any use of the Licensed Material that could lawfully
+     be made without permission under this Public License.
+
+  b. To the extent possible, if any provision of this Public License is
+     deemed unenforceable, it shall be automatically reformed to the
+     minimum extent necessary to make it enforceable. If the provision
+     cannot be reformed, it shall be severed from this Public License
+     without affecting the enforceability of the remaining terms and
+     conditions.
+
+  c. No term or condition of this Public License will be waived and no
+     failure to comply consented to unless expressly agreed to by the
+     Licensor.
+
+  d. Nothing in this Public License constitutes or may be interpreted
+     as a limitation upon, or waiver of, any privileges and immunities
+     that apply to the Licensor or You, including from the legal
+     processes of any jurisdiction or authority.
+
+
+=======================================================================
+
+Creative Commons is not a party to its public
+licenses. Notwithstanding, Creative Commons may elect to apply one of
+its public licenses to material it publishes and in those instances
+will be considered the “Licensor.” The text of the Creative Commons
+public licenses is dedicated to the public domain under the CC0 Public
+Domain Dedication. Except for the limited purpose of indicating that
+material is shared under a Creative Commons public license or as
+otherwise permitted by the Creative Commons policies published at
+creativecommons.org/policies, Creative Commons does not authorize the
+use of the trademark "Creative Commons" or any other trademark or logo
+of Creative Commons without its prior written consent including,
+without limitation, in connection with any unauthorized modifications
+to any of its public licenses or any other arrangements,
+understandings, or agreements concerning use of licensed material. For
+the avoidance of doubt, this paragraph does not form part of the
+public licenses.
+
+Creative Commons may be contacted at creativecommons.org.
+
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