1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
|
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <signal.h>
#define PORT 9000
#define HOST "127.0.0.1"
#define BUF_SIZE 2048
int sock;
/* Signal Handler for SIGINT */
void sigintHandler(int sig_num) {
errno = 0;
if (fcntl(sock, F_GETFD) != -1 || errno != EBADF) {
write(sock, "exit\n", 6);
close(sock);
}
printf("Terminating client\n");
fflush(stdout);
exit(-1);
}
static inline void die(const char *msg) {
perror(msg);
exit(-1);
}
int write_all(int sock, char *buffer, int size) {
int nwrite, sent = 0;
while (sent < size) {
if ((nwrite = write(sock, buffer + sent, size - sent)) < 0) {
perror("Write");
exit(1);
}
sent += nwrite;
}
return sent;
}
void send_file(int server_fd, char *path) {
printf("Trying to send \"%s\" to remote...\n", path);
char buffer[BUF_SIZE];
memset(buffer, 0, BUF_SIZE);
int tmp_fd, file_fd;
if ((tmp_fd = open(path, O_RDONLY)) == -1) {
perror("Open");
return;
}
FILE *file = fdopen(tmp_fd, "r");
fseek(file, 0L, SEEK_END);
long int sz = ftell(file);
fseek(file, 0L, SEEK_SET);
fclose(file);
close(tmp_fd);
if ((file_fd = open(path, O_RDONLY)) == -1) {
perror("Open");
return;
}
int length = snprintf(NULL, 0, "%ld", sz);
sprintf(buffer, "<<!%ld!", sz);
sprintf(&(buffer[3 + length + 1]), "%s\n", path);
write(server_fd, buffer, strlen(buffer));
memset(buffer, 0, BUF_SIZE);
errno = 0;
while (read(file_fd, buffer, sizeof(buffer)) > 0) {
printf("Sent %i bytes\n", write_all(server_fd, buffer, strlen(buffer) + 1));
}
if (errno)
perror("wad");
close(file_fd);
printf("done.\n");
}
#define BREAK 1
#define CONTINUE 2
int parse(int server_sock, char *buffer, ssize_t length) {
char cmd[4];
char path[BUF_SIZE - 3];
memcpy(cmd, buffer, 3);
cmd[3] = 0;
memcpy(path, buffer + 4, BUF_SIZE - 4);
path[strlen(path) - 1] = 0;
if (strcmp(cmd, "put") == 0) {
if (strlen(path) == 0) {
fprintf(stderr, "path missing\n");
} else {
send_file(sock, path);
}
return CONTINUE;
}
buffer[length] = '\0';
if (strspn(buffer, " \n\t") == strlen(buffer)) {
// skip empty lines - empty being just spaces or tabs
return CONTINUE;
}
if (write(server_sock, buffer, strlen(buffer)) < 0)
die("Could not send message");
if (strcmp(buffer, "exit\n") == 0) {
return BREAK;
}
return 0;
}
void read_stdin(int *done);
void read_server_sock(int *done);
int main() {
setvbuf(stdout, NULL, _IONBF, 0);
struct sockaddr_in addr = {
.sin_family = AF_INET,
.sin_port = htons(PORT),
.sin_addr.s_addr = inet_addr(HOST)
};
if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
die("Could not open socket");
if (connect(sock, (struct sockaddr *) &addr, sizeof(addr)) < 0)
die("Could not connect to socket");
signal(SIGINT, &sigintHandler);
pid_t pid = fork();
int done = 0;
if (pid == 0) {
read_stdin(&done);
} else {
read_server_sock(&done);
}
close(sock);
return 0;
}
void read_server_sock(int *done) {
char server_buffer[BUF_SIZE];
ssize_t length;
while (!*done) {
if ((length = read(sock, server_buffer, BUF_SIZE)) > 0) {
server_buffer[length] = '\0';
printf("%s", server_buffer);
if (server_buffer[length - 1] == '\n') {
printf("$> ");
fflush(stdout);
}
}
}
}
void read_stdin(int *done) {
char stdinp_buffer[BUF_SIZE];
ssize_t length;
while (!*done) {
memset(stdinp_buffer, 0, BUF_SIZE);
if ((length = read(STDIN_FILENO, stdinp_buffer, BUF_SIZE)) > 0) {
switch (parse(sock, stdinp_buffer, length)) {
case CONTINUE:
printf("$> ");
continue;
case BREAK:
*done = 1;
break;
default:
break;
}
}
}
}
|
