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comments for client.c

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elvis
2022-05-04 23:42:12 +02:00
parent f64dd54b84
commit 1aa5f2e1d9
2 changed files with 276 additions and 297 deletions
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229
src/client.c
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@ -1,5 +1,4 @@
#define _POSIX_C_SOURCE 200809L
#include <ctype.h>
#include <errno.h>
#include <signal.h>
@ -7,6 +6,7 @@
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
// fts uses this type but is not defined anywhere
typedef unsigned short u_short;
#include <sys/stat.h>
#include <fts.h>
@ -19,47 +19,42 @@ typedef unsigned short u_short;
#define UNIX_PATH_MAX 256
#define MAXARGLENGTH 256
// path of socket
static char globalSocket[UNIX_PATH_MAX] = "";
// struttura della lista dei comandi
// structure of the command list
typedef struct cmd_s {
char name; // nome del comando
char *arg; // (eventuale) argomento del comando
struct cmd_s *next; // puntatore al prossimo comando nella lista
char name; // name of the command
char *arg; // argument of the command
struct cmd_s *next; // pointer to next element
} cmd_t;
// -----------------------------------------------------------------------------
// helper functions
// libera la memoria della lista dei comandi
// frees command list's memory
void destroyCommandList(cmd_t *l);
// aggiunge un comando alla lista
// adds a command to the list
int addCommand(cmd_t **l, char cmd, char *arg);
// riordina i comandi
// reorder the list
int reorderCommandList(cmd_t **l);
// esegue tutti i comandi nella lista
// execute all commands
int execute(cmd_t *l, int print);
int printList(cmd_t *l);
// per chiudere la connessione prima dell'uscita
// close connection before the exit
void cleanup() {
if (strncmp(globalSocket, "", 2) != 0) {
closeConnection(globalSocket);
strncpy(globalSocket, "", 2);
}
}
// compare files
// to compare files (fts)
int compare(const FTSENT ** first, const FTSENT ** second) {
return (strcmp((*first)->fts_name, (*second)->fts_name));
}
// -h
static void usage(const char *argv0) {
// TODO change this
printf("Uso: %s\n", argv0);
printf("-h: stampa il presente messaggio d'aiuto.\n");
printf("-f filename: connettiti al socket AF_UNIX 'filename'.\n");
@ -105,7 +100,7 @@ int main(int argc, char* argv[]) {
struct sigaction siga;
// ignoro il segnale SIGPIPE
// ignore SIGPIPE
memset(&siga, 0, sizeof(siga));
siga.sa_handler = SIG_IGN;
if (sigaction(SIGPIPE, &siga, NULL) == -1) {
@ -113,7 +108,7 @@ int main(int argc, char* argv[]) {
return 1;
}
// lista dei comandi
// list of commands
cmd_t *cmds = NULL;
int opt = 0;
@ -122,13 +117,13 @@ int main(int argc, char* argv[]) {
int print = 0;
char f = 0;
// add args to list
// add args to command list
while ((opt = getopt(argc, argv, ":hpf:t:w:W:D:r:R:d:l:u:c:")) != -1) {
switch (opt) {
case 'h': // help message
usage(argv[0]);
goto _cleanup;
case 'f': // socket name
case 'f': // name of socket
if(!f) {
if (optarg && strnlen(optarg, MAXARGLENGTH) > 0 && optarg[0] == '-') {
fprintf(stderr, "Il comando -f necessita di un argomento.\n");
@ -141,10 +136,11 @@ int main(int argc, char* argv[]) {
}
break;
case 'p': // print to stdout
printInfo(1, stdout);
if(!print)
printInfo(1, stdout);
print|=1;
break;
case 'w': // send files from folder (n is read after)
case 'w': // send file from folder (n is read later)
if (optarg && strnlen(optarg, MAXARGLENGTH) > 0 && optarg[0] == '-') {
fprintf(stderr, "Il comando -w necessita di un argomento.\n");
goto _cleanup;
@ -154,13 +150,13 @@ int main(int argc, char* argv[]) {
addCommand(&cmds, opt, args);
break;
case 'W': // files to send separated by ','
case 'D': // directory to store recived files
case 'D': // dir to write file into
case 'r': // files to read from server separated by ','
case 'd': // directory to store read files
case 'd': // dir to write read files into
case 't': // time in ms between requests
case 'l': // file to request lock of separated by ','
case 'u': // file to relese lock of separated by ','
case 'c': // files to remove separated by ','
case 'l': // file to request lock on separated by ','
case 'u': // file to relese lock on separated by ','
case 'c': // file to delete separated by ','
if (optarg && strnlen(optarg, MAXARGLENGTH) > 0 && optarg[0] == '-') {
fprintf(stderr, "Il comando -%c necessita di un argomento.\n", optopt);
goto _cleanup;
@ -228,7 +224,7 @@ void destroyCommandList(cmd_t *l) {
}
cmd_t *tmp;
// scorro tutta la lista e libero la memoria
// visit every node and free memory
while (l) {
tmp = l;
@ -239,20 +235,6 @@ void destroyCommandList(cmd_t *l) {
}
}
int printList(cmd_t *l) {
if(!l) {
errno = EINVAL;
return -1;
}
cmd_t *tmp = l;
while(tmp) {
fprintf(stdout, "%c with args: [%s]\n", tmp->name, tmp->arg);
tmp = tmp->next;
}
return 0;
}
int addCommand(cmd_t **l, char cmd, char *arg) {
if(!l) {
errno = EINVAL;
@ -277,7 +259,7 @@ int addCommand(cmd_t **l, char cmd, char *arg) {
}
new->next = NULL;
// se lista vuota aggiungo in cima, altrimenti scorro la lista
// if empty list -> add to the top
if (*l == NULL) {
*l = new;
return 0;
@ -293,6 +275,7 @@ int addCommand(cmd_t **l, char cmd, char *arg) {
}
// inverts the order of -D and -d angainst -w, -W or -r, -R
// and adds -D/-d /dev/null after
int reorderCommandList(cmd_t **l) {
if(!l) {
errno = EINVAL;
@ -309,24 +292,25 @@ int reorderCommandList(cmd_t **l) {
switch (tmp->name) {
case 'd': {
if(prev == NULL || (prev->name != 'r' && prev->name != 'R')) {
fprintf(stdout, "\nError: -d has no -r or -R matching before\n");
fprintf(stderr, "Il comando -d necessita -r o -R prima\n");
return -1;
}
// invert tmp and prev
cmd_t t;
t.arg = tmp->arg;
t.name = tmp->name;
{ // invert tmp and prev
cmd_t t;
t.arg = tmp->arg;
t.name = tmp->name;
tmp->arg = prev->arg;
tmp->name = prev->name;
tmp->arg = prev->arg;
tmp->name = prev->name;
prev->arg = t.arg;
prev->name = t.name;
prev->arg = t.arg;
prev->name = t.name;
}
if(!tmp->next)
break;
// add redirect to dev/null for next command if it's r or R
// add redirect to /dev/null for next command if it's r or R
if(tmp->next->name == 'r' || tmp->next->name == 'R') {
cmd_t *new = calloc(1, sizeof(*new));
if(!new){
@ -351,19 +335,20 @@ int reorderCommandList(cmd_t **l) {
}
case 'D': {
if(prev == NULL || (prev->name != 'w' && prev->name != 'W')) {
fprintf(stdout, "\nError: -D has no -w or -W matching before\n");
fprintf(stderr, "Il comando -D necessita -w o -W prima\n");
return -1;
}
// invert tmp and prev
cmd_t t;
t.arg = tmp->arg;
t.name = tmp->name;
{ // invert tmp and prev
cmd_t t;
t.arg = tmp->arg;
t.name = tmp->name;
tmp->arg = prev->arg;
tmp->name = prev->name;
tmp->arg = prev->arg;
tmp->name = prev->name;
prev->arg = t.arg;
prev->name = t.name;
prev->arg = t.arg;
prev->name = t.name;
}
if(!tmp->next)
break;
@ -415,14 +400,14 @@ int execute(cmd_t *l, int print) {
// loop that serches for -t
while(tmp) {
switch(tmp->name) {
case 't': {// time in ms between requests
case 't': { // time in ms between requests
long num;
num = strtol(tmp->arg, NULL, 10);
if(num==0 && errno==EINVAL) {
perror("Invalid time specified after -t");
return -1;
}
// milliseconds converted to nanoseconds
// milliseconds to nanoseconds
interval.tv_nsec = (num%1000) * 1000000;
// seconds
interval.tv_sec = (num/1000);
@ -481,6 +466,8 @@ int execute(cmd_t *l, int print) {
// loop that checks for consistencies:
// 1) -D with no -w or -W after
// 2) -d with no -r or -R after
// reduntant since we also reorder before but this function could be used
// alone so we have to check
tmp = l;
int unmachedD = 0;
int unmachedd = 0;
@ -488,7 +475,7 @@ int execute(cmd_t *l, int print) {
switch (tmp->name) {
case 'D':
if(unmachedD) {
fprintf(stdout, "\nError: -D has no -w or -W matching after\n");
fprintf(stderr, "Il comando -D necessita -w o -W dopo\n");
return 0;
}
unmachedD = 1;
@ -499,7 +486,7 @@ int execute(cmd_t *l, int print) {
break;
case 'd':
if(unmachedd) {
fprintf(stdout, "\nError: -d has no -r or -R matching after\n");
fprintf(stderr, "Il comando -d necessita -r o -R dopo\n");
return 0;
}
unmachedd = 1;
@ -514,11 +501,11 @@ int execute(cmd_t *l, int print) {
tmp = tmp->next;
}
if(unmachedD) {
fprintf(stdout, "\nError: -D has no -w or -W matching after\n");
fprintf(stderr, "Il comando -D necessita -w o -W dopo\n");
return 0;
}
if(unmachedd) {
fprintf(stdout, "\nError: -d has no -r or -R matching after\n");
fprintf(stderr, "Il comando -d necessita -r o -R dopo\n");
return 0;
}
fflush(stdout);
@ -547,7 +534,7 @@ int execute(cmd_t *l, int print) {
perror("-D");
}
if (print)
printf("\nD - Cartella per le scritture: %s\tEsito: ok\n", Dir);
printf("D - Cartella per le scritture: %s [Esito: ok]\n", Dir);
break;
case 'r':
cmd_r(tmp->arg, dir, print);
@ -566,7 +553,7 @@ int execute(cmd_t *l, int print) {
perror("-d");
}
if(print)
printf("\nd - Cartella per le letture: %s\tEsito: ok\n", dir);
printf("d - Cartella per le letture: %s [Esito: ok]\n", dir);
break;
case 'l':
cmd_l(tmp->arg, print);
@ -602,6 +589,8 @@ int execute(cmd_t *l, int print) {
// -----------------------------------------------------------------------------
// funzioni relative ai comandi
// -f
int cmd_f(char *socket) {
if(!socket) {
errno = EINVAL;
@ -618,6 +607,7 @@ int cmd_f(char *socket) {
return 0;
}
// -w
int cmd_w(char *dirname, char *Dir, int print) {
if(!dirname) {
errno = EINVAL;
@ -625,7 +615,7 @@ int cmd_w(char *dirname, char *Dir, int print) {
}
int num;
// we copy dirname because we are nice
// copy dirname because we modify it after
char *tofree = calloc(strnlen(dirname, MAXARGLENGTH)+1, sizeof(char));
if(!tofree) {
perror("malloc");
@ -656,12 +646,11 @@ int cmd_w(char *dirname, char *Dir, int print) {
return -1;
}
if (print) {
printf("\nw - Scrivo i seguenti file sul server: \n");
fflush(stdout);
}
if (print)
printf("w - Scrivo i seguenti file sul server:\n");
// we use fts to traverse all files in the directory recursively
// and write them to a list so that we can open them later
FTS *fhandle = NULL;
FTSENT *child = NULL;
FTSENT *parent = NULL;
@ -694,7 +683,7 @@ int cmd_w(char *dirname, char *Dir, int print) {
if(print) {
printf("%s [", listFiles[i]);
}
// we send the file with the other function but set print to 0
// we send the file with cmd_W but set print to 0
int r = cmd_W(listFiles[i], Dir, 0);
if(print && !r) {
printf("Esito: ok");
@ -714,13 +703,14 @@ int cmd_w(char *dirname, char *Dir, int print) {
return 0;
}
// -W
int cmd_W(char *filelist, char *Dir, int print) {
if(!filelist) {
errno = EINVAL;
return -1;
}
// we copy filelist because we are nice
// we copy filelist because we modify it later
char *tofree = malloc(strnlen(filelist, MAXARGLENGTH)+1);
if(!tofree) {
perror("malloc");
@ -733,11 +723,10 @@ int cmd_W(char *filelist, char *Dir, int print) {
char *string = tofree;
if (print == 1) {
printf("W - Scrivo i seguenti file sul server: \n");
fflush(stdout);
printf("W - Scrivo i seguenti file sul server:\n");
}
int r = 0;
int r = 0; // return value
while ((token = strsep_gnu(&string, ",")) != NULL) {
int ok = 1;
int opened = 0;
@ -746,20 +735,21 @@ int cmd_W(char *filelist, char *Dir, int print) {
fflush(stdout);
}
// creo il file in modalita' locked
// create the file locked
if (openFile(token, O_CREATE | O_LOCK) == -1) {
ok = 0;
} else { // creato con successo
} else { // success
opened = 1;
}
// write to the file
if (opened && (writeFile(token, Dir) == -1)) {
ok = 0;
}
if (opened && !ok) { // errore precedente -> elimino il file vuoto
if (opened && !ok) { // previous error -> delete the empty file
removeFile(token);
} else if (opened && (closeFile(token) == -1)) { // chiudo il file
} else if (opened && (closeFile(token) == -1)) { // close the file
ok = 0;
}
@ -767,13 +757,12 @@ int cmd_W(char *filelist, char *Dir, int print) {
printf("Esito: ");
if (ok)
printf("ok");
printf("ok]\n");
else {
printf("errore");
perror("-w");
printf("errore]\n");
perror("-W");
}
printf("]\n");
fflush(stdout);
}
if(!ok)
@ -784,13 +773,14 @@ int cmd_W(char *filelist, char *Dir, int print) {
return r;
}
// -r
int cmd_r(char *filelist, char *dir, int print) {
if (!filelist) {
errno = EINVAL;
return -1;
}
// we copy filelist because we are nice
// we copy filelist because we modify it later
char *tofree = malloc(strnlen(filelist, MAXARGLENGTH)+1);
memset(tofree, 0, strnlen(filelist, MAXARGLENGTH)+1);
if(!tofree) {
@ -813,9 +803,9 @@ int cmd_r(char *filelist, char *dir, int print) {
if (print != 0) {
printf("%s ", token);
fflush(stdout);
}
// open the file
if (openFile(token, 0) == -1) {
ok = 0;
} else {
@ -828,8 +818,7 @@ int cmd_r(char *filelist, char *dir, int print) {
printInfo(0, stdout);
// read the content of the file
if (ok && readFile(token, &buf, &size) == -1) {
fprintf(stdout, "\nreadFile\n");
fflush(stdout);
fprintf(stderr, "Errore durante la readFile\n");
ok = 0;
}
if (print) {
@ -845,22 +834,18 @@ int cmd_r(char *filelist, char *dir, int print) {
// close the file
if (opened && closeFile(token) == -1) {
fprintf(stdout, "\ncloseFile\n");
fflush(stdout);
fprintf(stderr, "Errore durante la closeFile\n");
ok = 0;
}
if (print) {
printf("[Esito: ");
if (ok) {
printf("ok");
printf("ok]\n");
} else {
printf("errore");
printf("errore]\n");
perror("-r");
}
}
if (print) {
printf("]\n");
fflush(stdout);
}
}
@ -873,10 +858,10 @@ int cmd_r(char *filelist, char *dir, int print) {
printf("I file letti non sono stati memorizzati su disco.\n");
fflush(stdout);
}
return 0;
}
// -R
int cmd_R(char *numStr, char *dir, int print) {
if (print) {
printf("R - Leggo i seguenti file dal server:\n");
@ -884,7 +869,6 @@ int cmd_R(char *numStr, char *dir, int print) {
}
int n = -1;
if(!numStr) // skips the step of converting n from string to int
goto skipGetNumber;
@ -920,13 +904,14 @@ skipGetNumber:
return 0;
}
// -l
int cmd_l(char *filelist, int print) {
if (!filelist) {
errno = EINVAL;
return -1;
}
// we copy filelist because we are nice
// we copy filelist because we modify it later
char *tofree = calloc(strnlen(filelist, MAXARGLENGTH)+1, sizeof(char));
if(!tofree) {
perror("malloc");
@ -950,15 +935,12 @@ int cmd_l(char *filelist, int print) {
if (lockFile(token) == -1) {
if (print != 0) {
printf("errore");
printf("errore]\n");
fflush(stdout);
perror("-l");
}
} else if(print != 0) {
printf("ok");
}
if (print != 0) {
printf("]\n");
printf("ok]\n");
fflush(stdout);
}
}
@ -966,13 +948,14 @@ int cmd_l(char *filelist, int print) {
return 0;
}
// -u
int cmd_u(char *filelist, int print) {
if (!filelist) {
errno = EINVAL;
return -1;
}
// we copy filelist because we are nice
// we copy filelist because we modify it later
char *tofree = calloc(strnlen(filelist, MAXARGLENGTH)+1, sizeof(char));
if(!tofree) {
perror("calloc");
@ -996,15 +979,12 @@ int cmd_u(char *filelist, int print) {
if (unlockFile(token) == -1) {
if (print != 0) {
printf("errore");
printf("errore]\n");
fflush(stdout);
perror("-u");
}
} else if(print != 0) {
printf("ok");
}
if (print != 0) {
printf("]\n");
printf("ok]\n");
fflush(stdout);
}
}
@ -1012,13 +992,14 @@ int cmd_u(char *filelist, int print) {
return 0;
}
// -c
int cmd_c(char *filelist, int print) {
if (!filelist) {
errno = EINVAL;
return -1;
}
// we copy filelist because we are nice
// we copy filelist because we modify it later
char *tofree = calloc(strnlen(filelist, MAXARGLENGTH)+1, sizeof(char));
if(!tofree) {
perror("calloc");
@ -1042,24 +1023,22 @@ int cmd_c(char *filelist, int print) {
if (lockFile(token) == -1) {
if (print) {
printf("errore");
printf("errore]\n");
fflush(stdout);
perror("-c");
}
} else {
if (removeFile(token) == -1) {
if (print) {
printf("errore");
printf("errore]\n");
fflush(stdout);
perror("-c");
}
} else if (print) {
printf("ok");
printf("ok]\n");
fflush(stdout);
}
}
if (print != 0) {
printf("]\n");
fflush(stdout);
}
}
free(tofree);
return 0;