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openFile, readFile

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This commit is contained in:
elvis
2022-04-22 21:59:40 +02:00
parent cf93e53ade
commit 8e9cc3de13
2 changed files with 670 additions and 12 deletions
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669
lib/api/api.c
View File

@ -1,16 +1,35 @@
#include <string.h>
#include <errno.h> #include <errno.h>
#include <fcntl.h>
#include <stdio.h> #include <stdio.h>
#include <unistd.h>
#include <stdlib.h> #include <stdlib.h>
#include <string.h>
#include <sys/socket.h> #include <sys/socket.h>
#include <sys/un.h> #include <sys/stat.h>
#include <sys/time.h> #include <sys/time.h>
#include <sys/un.h>
#include <unistd.h>
#include <api.h> #include <api.h>
#include <conn.h>
#define SOCKNAMEMAX 256 // should be at least 108 #define SOCKNAMEMAX 256 // should be at least 108
#define MEOK "20" //OK
// #define ME "21" // not used
// #define ME "22" // not used
#define MEFP "25" // file purged
// #define ME "40" // not used
// #define ME "41" // not used
#define MESD "42" // shutting down
#define MENT "45" // requested file action not taken
#define MESY "50" // syntax error
// #define ME "51" // not used
// #define ME "52" // not used
#define MESE "55" // server error
// ----------------------------------------------------------------------------- // -----------------------------------------------------------------------------
/* structs */ /* structs */
typedef struct files_s { typedef struct files_s {
@ -20,13 +39,29 @@ typedef struct files_s {
typedef struct openfiles_s { typedef struct openfiles_s {
int numOfFiles; int numOfFiles;
files_t *f; files_t *f; // list of files
char *wDir; // for files sent from the server after openFile char *wDir; // for files sent from the server after openFile
char *rDir; // for files read from the server char *rDir; // for files read from the server
char *createdAndLocked; // path of the last file that was created and locked
int print; // whether to print int print; // whether to print
FILE *out; // where to print FILE *out; // where to print
} openfiles_t; } openfiles_t;
typedef struct recivedFile_s {
int64_t pathlen;
char *path;
int64_t filelen;
char *file;
} recivedFile_t;
typedef struct response_s {
char ME[2]; // response
int meerrno; // errno if sent
int numfiles; // number of files if sent
recivedFile_t *rf; // array of files
} response_t;
// ----------------------------------------------------------------------------- // -----------------------------------------------------------------------------
/* variabili globali */ /* variabili globali */
static int fd_skt; // descriptor of the socket static int fd_skt; // descriptor of the socket
@ -39,10 +74,18 @@ static openfiles_t *openedFiles = NULL;
// closes every file opened by the client // closes every file opened by the client
int closeEveryFile(); int closeEveryFile();
// closes and frees memory // closes and frees memory
int removeOpenFile(const char *pathname); int removeOpenFile(char *pathname);
// adds element
int addOpenFile(const char *pathname);
// checks if the file is open already
int isOpen(const char *pathname);
// reads everything the server sent into the variable passed to the function
// expected is 1 if a file could be sent (if no server errors occurs)
int reciveData(response_t *res, int expected);
// saves the files in the specified directory
int storeFilesInDirectory(char *dirname, int n, recivedFile_t *rf);
// frees memory inside response_t element
void freeResponse(response_t *res);
@ -62,6 +105,7 @@ int openConnection(const char* sockname, int msec, const struct timespec abstime
} }
openedFiles->f = NULL; openedFiles->f = NULL;
openedFiles->numOfFiles = 0; openedFiles->numOfFiles = 0;
openedFiles->createdAndLocked = NULL;
openedFiles->rDir = NULL; openedFiles->rDir = NULL;
openedFiles->wDir = NULL; openedFiles->wDir = NULL;
openedFiles->print = 0; openedFiles->print = 0;
@ -130,6 +174,8 @@ int closeConnection(const char* sockname) {
memset(socketName, 0, SOCKNAMEMAX); memset(socketName, 0, SOCKNAMEMAX);
if (openedFiles) { if (openedFiles) {
if(openedFiles->createdAndLocked)
free(openedFiles->createdAndLocked);
if(openedFiles->wDir) if(openedFiles->wDir)
free(openedFiles->wDir); free(openedFiles->wDir);
if(openedFiles->rDir) if(openedFiles->rDir)
@ -141,11 +187,232 @@ int closeConnection(const char* sockname) {
} }
int openFile(const char* pathname, int flags) { int openFile(const char* pathname, int flags) {
return 1; if(!pathname){
errno = EINVAL;
return -1;
}
if(!openedFiles){
errno = EPROTO;
return -1;
}
if(openedFiles->createdAndLocked)
free(openedFiles->createdAndLocked);
openedFiles->createdAndLocked = NULL;
if(strcmp(socketName, "") == 0) {
errno = ENOTCONN;
return -1;
}
if(isOpen(pathname)) { // already open
return -1;
}
// invio al server la stringa "openFile|$(pathname)|$(flags)"
size_t len = strlen("openFile")+1+strlen(pathname)+1+sizeof(flags)+1;
char *cmd = malloc(len);
if(!cmd) {
perror("malloc");
return -1;
}
memset(cmd, 0, len);
snprintf(cmd, len, "openFile|%s|%d", pathname, flags);
// send cmd
if (writen(fd_skt, cmd, len) == -1) {
// writen sets errno
free(cmd);
return -1;
}
// recive response
response_t *res = calloc(1, sizeof(response_t));
if(!res){
perror("calloc");
free(cmd);
return -1;
}
if(reciveData(res, 0) < 0) { // 0 because if we get a MEOK we dont expect a file
// errno is set by reciveData
freeResponse(res);
free(res);
free(cmd);
return -1;
}
if(res->meerrno != 0) {
// errno from server
freeResponse(res);
errno = res->meerrno;
free(res);
free(cmd);
return -1;
}
if(strncmp(res->ME, MEFP, sizeof(res->ME)) == 0) {
// some files were purged
if(openedFiles->print){
fprintf(openedFiles->out, "Il server ha espulso i seguenti file:");
fflush(stdout);
for(int i=0;i<res->numfiles;++i) {
fprintf(openedFiles->out, "%d) %s", i, res->rf[i].path);
}
}
if(openedFiles->wDir) {
if(openedFiles->print) {
fprintf(openedFiles->out, "I file espulsi sono stati scritti nella cartella: %s", openedFiles->wDir);
fflush(stdout);
}
if(storeFilesInDirectory(openedFiles->wDir, res->numfiles, res->rf) == -1) {
perror("storeFilesindirectory");
freeResponse(res);
free(res);
free(cmd);
return -1;
}
} else {
if(openedFiles->print) {
fprintf(openedFiles->out, "I file espulsi non sono stati memorizzati su disco");
fflush(stdout);
}
}
}
if(addOpenFile(pathname) == -1) {
perror("addOpenFile");
return -1;
}
if(flags == (O_CREATE | O_LOCK)) {
if(openedFiles->createdAndLocked)
free(openedFiles->createdAndLocked);
openedFiles->createdAndLocked = calloc(strlen(pathname)+1, sizeof(char));
if(!openedFiles->createdAndLocked) {
perror("calloc");
freeResponse(res);
free(res);
free(cmd);
return -1;
}
strcpy(openedFiles->createdAndLocked, pathname);
}
freeResponse(res);
free(res);
free(cmd);
return 0;
} }
int readFile(const char* pathname, void** buf, size_t* size) { int readFile(const char* pathname, void** buf, size_t* size) {
return 1; if(!pathname) {
errno = EINVAL;
return -1;
}
if(!openedFiles){
errno = EPROTO;
return -1;
}
if(openedFiles->createdAndLocked)
free(openedFiles->createdAndLocked);
openedFiles->createdAndLocked = NULL;
if(strcmp(socketName, "") == 0) {
errno = ENOTCONN;
return -1;
}
if (isOpen(pathname) != 1) { // if it's not open => error
errno = EPERM;
return -1;
}
// invio al server la stringa readFile|$(pathname)"
size_t len = strlen("readFile")+1+strlen(pathname)+1;
char *cmd = malloc(len);
if(!cmd) {
perror("malloc");
return -1;
}
memset(cmd, 0, len);
snprintf(cmd, len, "readFile|%s", pathname);
// send cmd
if (writen(fd_skt, cmd, len) == -1) {
// writen sets errno
free(cmd);
return -1;
}
// recive response
response_t *res = calloc(1, sizeof(response_t));
if(!res){
perror("calloc");
free(cmd);
return -1;
}
if(reciveData(res, 1) < 0) { // 1 because if we get a MEOK we expect a file
// errno is set by reciveData
freeResponse(res);
free(res);
free(cmd);
return -1;
}
if(res->meerrno != 0) {
// errno from server
freeResponse(res);
errno = res->meerrno;
free(res);
free(cmd);
return -1;
}
// no errors from server
if(res->numfiles != 1) {
freeResponse(res);
free(res);
free(cmd);
errno = EMSGSIZE;
return -1;
}
*size = (size_t) res->rf[0].filelen;
*buf = malloc(*size);
if(!*buf) {
freeResponse(res);
free(res);
free(cmd);
perror("malloc");
return -1;
}
memcpy(*buf, res->rf[0].file, *size);
if(openedFiles->print) {
printf("Letto il file: %s", res->rf[0].path);
printf("Di dimensione: %ld B\n", *size);
fflush(stdout);
}
if(openedFiles->rDir) {
if(openedFiles->print) {
fprintf(openedFiles->out, "Il file letto e' stato scritto nella cartella: %s", openedFiles->rDir);
fflush(stdout);
}
if(storeFilesInDirectory(openedFiles->rDir, 1, res->rf) == -1) {
perror("storeFilesindirectory");
freeResponse(res);
free(res);
free(cmd);
return -1;
}
} else {
if(openedFiles->print) {
fprintf(openedFiles->out, "Il file letto non è stato memorizzato su disco");
fflush(stdout);
}
}
freeResponse(res);
free(res);
free(cmd);
return 0;
} }
int readNFiles(int N, const char* dirname) { int readNFiles(int N, const char* dirname) {
@ -191,7 +458,387 @@ void printInfo(int p, FILE *stream) {
// ----------------------------------------------------------------------------- // -----------------------------------------------------------------------------
int removeOpenFile(const char *pathname) { int reciveData(response_t *res, int expected) {
if(!res) {
errno = EINVAL;
return -1;
}
int readnres;
readnres = readn(fd_skt, res->ME, sizeof(res->ME));
if(readnres <= 0) {
// readn sets errno
return -1;
}
if(expected == 0) // no file expected
goto _nofile;
// file is expected
if(strncmp(res->ME, MEOK, sizeof(res->ME))==0){
// ok response
res->meerrno = 0;
// get number of files sent
readnres = readn(fd_skt, &res->numfiles, sizeof(int));
if(readnres<=0) // readn sets errno
return -1;
if(res->rf)
free(res->rf);
res->rf = calloc(res->numfiles, sizeof(recivedFile_t));
if(!res->rf){
perror("calloc");
return -1;
}
// get files
for(int i=0;i<res->numfiles;++i) {
// read path
readnres = readn(fd_skt, &res->rf[i].pathlen, sizeof(int64_t));
if(readnres<=0) // readn sets errno
return -1;
res->rf[i].path = calloc(res->rf[i].pathlen, sizeof(char));
if(!res->rf[i].path){
perror("calloc");
return -1;
}
readnres = readn(fd_skt, res->rf[i].path, res->rf[i].pathlen);
if(readnres<=0) // readn sets errno
return -1;
// we replace '/' char with '-'
for(int j=0;j<res->rf[i].pathlen; ++j){
if(res->rf[i].path[j] == '/')
res->rf[i].path[j] = '-';
}
// read file
readnres = readn(fd_skt, &res->rf[i].filelen, sizeof(int64_t));
if(readnres<=0) // readn sets errno
return -1;
res->rf[i].file = calloc(res->rf[i].filelen, sizeof(char));
if(!res->rf[i].file){
perror("calloc");
return -1;
}
readnres = readn(fd_skt, res->rf[i].file, res->rf[i].filelen);
if(readnres<=0) // readn sets errno
return -1;
}
return 0;
}
if(strncmp(res->ME, MEFP, sizeof(res->ME))==0){
// file purged
res->meerrno = 0;
// get number of files sent
readnres = readn(fd_skt, &res->numfiles, sizeof(int));
if(readnres<=0) // readn sets errno
return -1;
if(res->rf)
free(res->rf);
res->rf = calloc(res->numfiles, sizeof(recivedFile_t));
if(!res->rf){
perror("calloc");
return -1;
}
// get files
for(int i=0;i<res->numfiles;++i) {
// read path
readnres = readn(fd_skt, &res->rf[i].pathlen, sizeof(int64_t));
if(readnres<=0) // readn sets errno
return -1;
res->rf[i].path = calloc(res->rf[i].pathlen, sizeof(char));
if(!res->rf[i].path){
perror("calloc");
return -1;
}
readnres = readn(fd_skt, res->rf[i].path, res->rf[i].pathlen);
if(readnres<=0) // readn sets errno
return -1;
// we replace '/' char with '-'
for(int j=0;j<res->rf[i].pathlen; ++j){
if(res->rf[i].path[j] == '/')
res->rf[i].path[j] = '-';
}
// read file
readnres = readn(fd_skt, &res->rf[i].filelen, sizeof(int64_t));
if(readnres<=0) // readn sets errno
return -1;
res->rf[i].file = calloc(res->rf[i].filelen, sizeof(char));
if(!res->rf[i].file){
perror("calloc");
return -1;
}
readnres = readn(fd_skt, res->rf[i].file, res->rf[i].filelen);
if(readnres<=0) // readn sets errno
return -1;
}
return 0;
}
if(strncmp(res->ME, MESD, sizeof(res->ME))==0){
// server shutting down
readnres = readn(fd_skt, &res->meerrno, sizeof(errno));
if(readnres <= 0)// readn sets errno
return -1;
return 0;
}
if(strncmp(res->ME, MENT, sizeof(res->ME))==0){
// requested file action not taken
readnres = readn(fd_skt, &res->meerrno, sizeof(errno));
if(readnres <= 0)// readn sets errno
return -1;
return 0;
}
if(strncmp(res->ME, MESY, sizeof(res->ME))==0){
// syntax error
readnres = readn(fd_skt, &res->meerrno, sizeof(errno));
if(readnres <= 0)// readn sets errno
return -1;
return 0;
}
if(strncmp(res->ME, MESE, sizeof(res->ME))==0){
// server error
readnres = readn(fd_skt, &res->meerrno, sizeof(errno));
if(readnres <= 0)// readn sets errno
return -1;
return 0;
}
errno = ENOPROTOOPT;
return -2;
_nofile:
res->numfiles = 0;
if(res->rf)
free(res->rf);
res->rf = NULL;
if(strncmp(res->ME, MEOK, sizeof(res->ME))==0){
// simple ok response
res->meerrno = 0;
return 0;
}
if(strncmp(res->ME, MEFP, sizeof(res->ME))==0){
// file purged
res->meerrno = 0;
// get number of files sent
readnres = readn(fd_skt, &res->numfiles, sizeof(int));
if(readnres<=0) // readn sets errno
return -1;
if(res->rf)
free(res->rf);
res->rf = calloc(res->numfiles, sizeof(recivedFile_t));
if(!res->rf){
perror("calloc");
return -1;
}
// get files
for(int i=0;i<res->numfiles;++i) {
// read path
readnres = readn(fd_skt, &res->rf[i].pathlen, sizeof(int64_t));
if(readnres<=0) // readn sets errno
return -1;
res->rf[i].path = calloc(res->rf[i].pathlen, sizeof(char));
if(!res->rf[i].path){
perror("calloc");
return -1;
}
readnres = readn(fd_skt, res->rf[i].path, res->rf[i].pathlen);
if(readnres<=0) // readn sets errno
return -1;
// we replace '/' char with '-'
for(int j=0;j<res->rf[i].pathlen; ++j){
if(res->rf[i].path[j] == '/')
res->rf[i].path[j] = '-';
}
// read file
readnres = readn(fd_skt, &res->rf[i].filelen, sizeof(int64_t));
if(readnres<=0) // readn sets errno
return -1;
res->rf[i].file = calloc(res->rf[i].filelen, sizeof(char));
if(!res->rf[i].file){
perror("calloc");
return -1;
}
readnres = readn(fd_skt, res->rf[i].file, res->rf[i].filelen);
if(readnres<=0) // readn sets errno
return -1;
}
return 0;
}
if(strncmp(res->ME, MESD, sizeof(res->ME))==0){
// server shutting down
readnres = readn(fd_skt, &res->meerrno, sizeof(errno));
if(readnres <= 0)// readn sets errno
return -1;
return 0;
}
if(strncmp(res->ME, MENT, sizeof(res->ME))==0){
// requested file action not taken
readnres = readn(fd_skt, &res->meerrno, sizeof(errno));
if(readnres <= 0)// readn sets errno
return -1;
return 0;
}
if(strncmp(res->ME, MESY, sizeof(res->ME))==0){
// syntax error
readnres = readn(fd_skt, &res->meerrno, sizeof(errno));
if(readnres <= 0)// readn sets errno
return -1;
return 0;
}
if(strncmp(res->ME, MESE, sizeof(res->ME))==0){
// server error
readnres = readn(fd_skt, &res->meerrno, sizeof(errno));
if(readnres <= 0)// readn sets errno
return -1;
return 0;
}
errno = ENOPROTOOPT;
return -2;
}
int storeFilesInDirectory(char *dirname, int n, recivedFile_t *rf) {
if(!dirname || strcmp(dirname, "") || !rf || n<0) {
errno = EINVAL;
return -1;
}
// create directory
if(mkdir(dirname, 0777) == -1) {
if(errno != EEXIST) { // unknown error
return -1;
}
}
size_t basepathlen = strlen(dirname)+1+1; // +1 for '/' and +1 for '\0'
char *basepath = calloc(basepathlen, sizeof(char));
if(!basepath) {
perror("calloc");
return -1;
}
strcpy(basepath, dirname);
strlcat(basepath, "/", basepathlen);
// for each file, create and write
for(int i=0;i<n;++i) {
char *filename = calloc(basepathlen + rf[i].pathlen, sizeof(char));
if(!filename){
perror("calloc");
free(basepath);
return -1;
}
strcpy(filename, basepath);
strlcat(filename, rf[i].path, basepathlen + rf[i].pathlen);
int fdo;
if((fdo = open(filename, O_WRONLY | O_CREAT, 0666)) == -1) { // open
free(filename);
free(basepath);
return -1;
}
if(write(fdo, rf[i].file, rf[i].filelen) == -1) { // write
free(filename);
free(basepath);
return -1;
}
if(close(fdo) == -1) { // close
free(filename);
free(basepath);
return -1;
}
free(filename);
}
free(basepath);
return 0;
}
void freeResponse(response_t *res) {
if(!res)
return;
if(res->numfiles>0 && res->rf){
for(int i=0;i<res->numfiles;++i){
free(res->rf[i].path);
free(res->rf[i].file);
}
free(res->rf);
}
if(res->rf)
free(res->rf);
return;
}
int isOpen(const char *pathname) {
if(!pathname) {
errno = EINVAL;
return -1;
}
if (openedFiles == NULL || openedFiles->f == NULL || openedFiles->numOfFiles == 0) {
return 0;
}
files_t *tmp = openedFiles->f;
while(tmp) {
if(strcmp(tmp->filename, pathname) == 0)
return 1;
tmp = tmp->next;
}
return 0;
}
int addOpenFile(const char *pathname) {
if(!pathname) {
errno = EINVAL;
return -1;
}
files_t *new = malloc(sizeof(files_t));
if(!new) {
perror("malloc");
return -1;
}
size_t len = strlen(pathname)+1;
new->filename = calloc(len, sizeof(char));
if(!new->filename) {
perror("calloc");
free(new);
return -1;
}
strlcpy(new->filename, pathname, len);
new->next = NULL;
if(openedFiles->f == NULL) {
openedFiles->f = new;
openedFiles->numOfFiles = 1;
return 0;
}
files_t *tail = openedFiles->f;
while(tail->next) {
tail = tail->next;
}
tail->next = new;
openedFiles->numOfFiles++;
return 0;
}
int removeOpenFile(char *pathname) {
if(!pathname) { if(!pathname) {
errno = EINVAL; errno = EINVAL;
return -1; return -1;

13
lib/threadpool/apiFile.c
View File

@ -12,7 +12,7 @@
#define LOGBUFSIZE 2048 #define LOGBUFSIZE 2048
#define MEOK "20" //OK #define MEOK "20" //OK
#define MEHE "21" // help message // #define ME "21" // not used
// #define ME "22" // not used // #define ME "22" // not used
#define MEFP "25" // file purged #define MEFP "25" // file purged
@ -131,6 +131,12 @@ void sendMessageFile(char *m, fileT *f, long fd_c, taglia_t *taglia, char *mlog)
goto _sendMF_cleanup; goto _sendMF_cleanup;
} }
int n = 1;
if(writen(fd_c, &n, sizeof(n)) < 0) {
perror("writen");
goto _sendMF_cleanup;
}
if(sendFile(f, fd_c, taglia) < 0) { if(sendFile(f, fd_c, taglia) < 0) {
perror("sendFile"); perror("sendFile");
goto _sendMF_cleanup; goto _sendMF_cleanup;
@ -165,6 +171,11 @@ void sendMessageFileN(char *m, fileT **f, int n, long fd_c, taglia_t *taglia, ch
goto _sendMFN_cleanup; goto _sendMFN_cleanup;
} }
if(write(fd_c, &n, sizeof(n)) < 0) {
perror("writen");
goto _sendMFN_cleanup;
}
for(int i=0; i<n && (f[i]!=NULL); ++i) { for(int i=0; i<n && (f[i]!=NULL); ++i) {
if(sendFile(f[i], fd_c, taglia) < 0) { if(sendFile(f[i], fd_c, taglia) < 0) {
perror("sendFile"); perror("sendFile");