321 lines
11 KiB
C
321 lines
11 KiB
C
#include "server.h"
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void DROP_SERVER(char* serverHost, char** givenPort, int* listenSocket){
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if( DEBUGMOD ) printf("====== DROP_SERVER(%s, %s, %d) ======\n\n", serverHost, *givenPort, *listenSocket);
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// FONCTIONNEMENT
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struct addrinfo hints; // contiendra le filtre/format
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struct addrinfo* addrinfo; // contiendra les infos du serveur
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int SOCKET, BIND, LISTEN; // file_desc(s)
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// INFOS
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struct sockaddr_storage serverInfo; // contiendra les informations du server
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socklen_t sockaddr_len = sizeof(struct sockaddr_storage);
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char infoHost[maxHostLen]; // contiendra l'adresse du server
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char infoPort[maxPortLen]; // contiendra le port du server
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/* [1] On définit le filtre/format
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=======================================================*/
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memset(&hints, 0, sizeof(struct addrinfo)); // on vide le filtre
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hints.ai_family = AF_UNSPEC; // Allow IPv4 ou IPv6
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hints.ai_socktype = SOCK_STREAM; // TCP (SOCK_DGRAM = UDP)
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hints.ai_flags = AI_PASSIVE; // mode SERVER
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hints.ai_protocol = 0; // non spécifié
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if( DEBUGMOD ) printf("============HINTS===========\n");
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if( DEBUGMOD ) printf( "AI_FLAGS = %d\n", hints.ai_flags ); // int
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if( DEBUGMOD ) printf( "AI_FAMILY = %d\n", hints.ai_family ); // int
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if( DEBUGMOD ) printf( "AI_SOCKTYPE = %d\n", hints.ai_socktype ); // int
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if( DEBUGMOD ) printf( "AI_PROTOCOL = %d\n", hints.ai_protocol ); // int
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if( DEBUGMOD ) printf( "AI_ADDRLEN = %d\n", hints.ai_addrlen ); // int
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if( DEBUGMOD ) printf("\n");
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/* [2] On récupère les infos
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=======================================================*/
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if( strlen(*givenPort) == 0 ) // si pas défini, port dynamique
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getaddrinfo(serverHost, 0, &hints, &addrinfo);
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else // sinon manuel
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getaddrinfo(serverHost, *givenPort, &hints, &addrinfo);
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// Remarque: port=0 donc va être défini dynamiquement
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if( DEBUGMOD ) printf("=============RES============\n");
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if( DEBUGMOD ) printf( "AI_FLAGS = %d\n", addrinfo->ai_flags ); // int
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if( DEBUGMOD ) printf( "AI_FAMILY = %d\n", addrinfo->ai_family ); // int
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if( DEBUGMOD ) printf( "AI_SOCKTYPE = %d\n", addrinfo->ai_socktype ); // int
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if( DEBUGMOD ) printf( "AI_PROTOCOL = %d\n", addrinfo->ai_protocol ); // int
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if( DEBUGMOD ) printf( "AI_ADDRLEN = %d\n", addrinfo->ai_addrlen ); // int
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if( DEBUGMOD ) printf("\n");
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/* [3] Création de la socket
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=======================================================*/
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SOCKET = socket(addrinfo->ai_family, addrinfo->ai_socktype, 0);
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if( DEBUGMOD ) printf("SOCKET = %d\n", SOCKET);
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// si erreur
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if( SOCKET == -1 ) return;
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/* [4] On publie la SOCKET
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=======================================================*/
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BIND = bind(
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SOCKET,
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addrinfo->ai_addr,
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addrinfo->ai_addrlen
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);
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if( DEBUGMOD ) printf("BIND = %d\n", BIND);
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// si erreur
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if( BIND == -1 ) return;
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/* [5] On récupère les informations du serveur (host/port)
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=======================================================*/
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int getInfo = getsockname(SOCKET, (struct sockaddr *) &serverInfo, &sockaddr_len);
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if( getInfo == -1 ) return;
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getInfo = getnameinfo( // on récupère le host et le port
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(struct sockaddr *) &serverInfo,
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sizeof(serverInfo),
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infoHost, maxHostLen,
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infoPort, maxPortLen,
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NI_NUMERICHOST | NI_NUMERICSERV
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);
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if( getInfo == -1 ) return;
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if( DEBUGMOD ) printf("Server host: %s\n", infoHost);
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if( DEBUGMOD ) printf("Server port: %s\n", infoPort);
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// on a plus besoin des infos de l'adresse
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freeaddrinfo(addrinfo);
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/* [6] On met la socket sur écoute
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=======================================================*/
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LISTEN = listen(SOCKET, maxListLen);
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if( DEBUGMOD ) printf("LISTEN = %d\n", LISTEN);
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// si erreur
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if( LISTEN == -1 ) return;
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/* [7] On envoie les données par référence
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=======================================================*/
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// port
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*givenPort = malloc( maxPortLen );
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strcpy(*givenPort, infoPort);
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// socket d'écoute
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*listenSocket = SOCKET;
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}
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// CMD: CLIENT (SRV) PROXY (CLT) FTP
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// DTA: CLIENT (CLT) PROXY (CLT) FTP
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//
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void MANAGE_REQUEST(char* pRequest, int* DUSER_SOCKET, int* DFTP_SOCKET){
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if( DEBUGMOD ) printf("====== MANAGE_REQUEST(%s, %d, %d) ======\n\n", pRequest, *DUSER_SOCKET, *DFTP_SOCKET);
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char answer[maxBuffLen]; // contiendra la réponse
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int nbSend; // contiendra le nombre de données envoyées
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char rCommand[10]; // contiendra les commandes (1ère partie)
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char rContent[maxBuffLen]; // contiendra le contenu associé à la commande (2ème partie)
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// on vide les buffers
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memset(&rCommand, '\0', sizeof(rCommand));
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memset(&rContent, '\0', sizeof(rContent));
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memset(&answer, '\0', sizeof(answer));
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/* [1] On découpe la requête en 2 parties
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================================================*/
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splitFtpRequest(pRequest, rCommand, rContent);
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/* [2] Selection en fonction de @rCommand
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================================================*/
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/* (1) PORT a1,a2,a3,a4,p1,p2 => utilisateur (actif)
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--------------------------------------------*/
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if( strcmp(rCommand, "PORT") == 0 ){
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int a1, a2, a3, a4 = 0;
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int p1, p2 = 0;
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char serverHost[maxHostLen];
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char serverPort[maxPortLen];
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char BUFFER[maxBuffLen];
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sscanf(pRequest, "PORT %d,%d,%d,%d,%d,%d", &a1, &a2, &a3, &a4, &p1, &p2);
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// on récupère l'adresse en <char*>
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sprintf(serverHost, "%d.%d.%d.%d", a1, a2, a3, a4);
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// on récupère le port en <char*>
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sprintf(serverPort, "%d", p1*256+p2);
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// on se connecte au client
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printf("CONNECTING TO CLIENT %s:%s\n", serverHost, serverPort);
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CONNECT_CLIENT(serverHost, serverPort, DUSER_SOCKET);
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printf("CONNECTED TO CLIENT %s:%s\n", serverHost, serverPort);
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// on envoie PASV car on veut être en mode passif entre le proxy et le serveur FTP
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strcpy(pRequest, "PASV\n");
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}
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// WAIT_SOCKET_UPDATE(DFTP_SOCKET, BUFFER);
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// xPrint("FTPLIST: %s\n", BUFFER);
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/* [3] Envoi de la réponse
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================================================*/
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}
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void MANAGE_RESPONSE(char** pAnswer, int* DUSER_SOCKET, int* DFTP_SOCKET){
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if( DEBUGMOD ) printf("====== MANAGE_RESPONSE(%s, %d, %d) ======\n\n", *pAnswer, *DUSER_SOCKET, *DFTP_SOCKET);
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char response[maxBuffLen]; // contiendra la réponse
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char ftpCode[4]; // contiendra le code FTP (1ère partie)
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char ftpText[maxBuffLen]; // contiendra le texte associé à la commande (2ème partie)
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// on vide les buffers
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memset(&ftpCode, '\0', sizeof(ftpCode));
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memset(&ftpText, '\0', sizeof(ftpText));
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memset(&response, '\0', sizeof(response));
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/* [1] On découpe la requête en 2 parties
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================================================*/
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splitFtpResponse(*pAnswer, ftpCode, ftpText);
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/* [2] Selection en fonction de @ftpCode
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================================================*/
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/* (2) Demande d'username
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--------------------------------------------*/
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if( strcmp(ftpCode, "220") == 0 )
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strcpy(response, WLCM_MSG);
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/* (3) username OK -> demande MDP
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--------------------------------------------*/
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else if( strcmp(ftpCode, "331") == 0 )
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strcpy(response, USER_MSG);
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/* (3) Bon mdp -> connection
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--------------------------------------------*/
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else if( strcmp(ftpCode, "230") == 0 )
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strcpy(response, PASS_BON_MSG);
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/* (4) Mauvais mdp -> connection
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--------------------------------------------*/
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else if( strcmp(ftpCode, "530") == 0 )
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strcpy(response, PASS_BAD_MSG);
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/* (5) Info SYST
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--------------------------------------------*/
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// else if( strcmp(ftpCode, "215") == 0 )
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// strcpy(response, "bla\n");
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/* (6) LOGOUT => EXIT
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--------------------------------------------*/
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else if( strcmp(ftpCode, "221") == 0 )
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strcpy(response, EXIT_MSG);
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/* (7) Mode passif => On lance les SOCKETS du BUS DE DONNEES
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--------------------------------------------*/
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else if( strcmp(ftpCode, "227") == 0 ){ // on lance la SOCKET FTP du BUS DE DONNEES
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strcpy(response, "200 Tout s'est bien passé.\n");
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int a1, a2, a3, a4 = 0;
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int p1, p2 = 0;
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char serverHost[maxHostLen];
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char serverPort[maxPortLen];
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sscanf(*pAnswer, "227 Entering Passive Mode (%d,%d,%d,%d,%d,%d)", &a1, &a2, &a3, &a4, &p1, &p2);
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// on récupère l'adresse en <char*>
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sprintf(serverHost, "%d.%d.%d.%d", a1, a2, a3, a4);
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// on récupère le port en <char*>
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sprintf(serverPort, "%d", p1*256+p2);
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// on se connecte au serveur FTP
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printf("CONNECTING TO FTP %s:%s\n", serverHost, serverPort);
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CONNECT_CLIENT(serverHost, serverPort, DFTP_SOCKET);
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printf("CONNECTED TO FTP %s:%s\n", serverHost, serverPort);
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}
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/* (8) On lit la SOCKET FTP du BUS DE DONNEES
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--------------------------------------------*/
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else if( strcmp(ftpCode, "150") == 0 ){ // on lit la SOCKET FTP du BUS DE DONNEES
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char BUFFER[maxBuffLen];
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// on lit la SOCKET FTP
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if( sread(DFTP_SOCKET, BUFFER) == -1 ) printf("ERROR\n");
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else xPrint("[BUS_IN]: %s\n", BUFFER);
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// on redirige sur la SOCKET utilisateur
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if( swrite(DUSER_SOCKET, BUFFER) == -1 ) printf("ERROR\n");
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else xPrint("[BUS_OUT]: %s\n", BUFFER);
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}
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/* (9) Fin de transfert de données
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--------------------------------------------*/
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else if( strcmp(ftpCode, "226") == 0 ){ // on ferme les SOCKETS du BUS DE DONNEES
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strcpy(response, *pAnswer);
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close(*DUSER_SOCKET);
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close(*DFTP_SOCKET);
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}
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/* (n) Commande inconnue
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--------------------------------------------*/
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else
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strcpy(response, *pAnswer);
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/* [3] Retour de la réponse
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================================================*/
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strcpy(*pAnswer, response);
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}
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int WAIT_SOCKET_UPDATE(int* pSocket, char* pBuffer){
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memset(pBuffer, 0, maxBuffLen); // on vide le buffer
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int nbRead = 0;
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do{
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nbRead = sread(pSocket, pBuffer);
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// si on est déconnecté, on ferme la SOCKET
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if( nbRead == -1 ){
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printf("Client déconnecté!\n");
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return -1;
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}
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}while( pBuffer[nbRead-1] != '\n' && pBuffer[nbRead-2] != '\r' );
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// on retourne -1 si erreur, SINON 0
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return nbRead;
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} |