163 lines
3.3 KiB
C
163 lines
3.3 KiB
C
#include "defs.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <netinet/ip.h>
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#include <arpa/inet.h>
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#include <unistd.h>
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#include <pthread.h>
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#include <string.h>
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typedef struct databuf {
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char *d;
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int l;
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struct databuf *next;
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} databuf;
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typedef struct {
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int s;
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int sc;
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pthread_mutex_t lock;
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pthread_mutex_t datalock;
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pthread_cond_t datacond;
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databuf * volatile head, *tail;
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} forward_data;
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static void *data_sender(void *_f)
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{
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forward_data *f = _f;
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databuf *cur;
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char *buf, *b;
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int size;
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wait:
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if (pthread_mutex_lock(&f->datalock)) abort();
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while (f->head == NULL)
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if (pthread_cond_wait(&f->datacond, &f->datalock)) abort();
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cur = f->head;
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buf = cur->d;
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size = cur->l;
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f->head = cur->next;
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if (f->head == NULL) f->tail = NULL;
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if (pthread_mutex_unlock(&f->datalock)) abort();
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free(cur);
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goto process;
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process:
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if (pthread_mutex_lock(&f->lock)) abort();
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int *x = (int*)buf;
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if (*x < 0 || *x >= 132) printf("bad id %d\n", *x);
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printf("DATA_SENDER sends type %d\n", *x);
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b = buf;
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while (size) {
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int l = write(f->s, b, size);
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printf("DATA_SENDER write buffer %p len %d returns %d\n", b, size, l);
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if (l <= 0) { printf("forward error\n"); exit(1); }
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size -= l;
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b += l;
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}
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if (pthread_mutex_unlock(&f->lock)) abort();
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free(buf);
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goto wait;
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}
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static void do_forward(forward_data *f, int from, int to, int lock)
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{
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int l, len;
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char *b;
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char buf[1024];
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while (1) {
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len = read(from, buf, 1024);
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if (len <= 0) break;
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b = buf;
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if (lock) if (pthread_mutex_lock(&f->lock)) abort();
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while (len) {
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l = write(to, b, len);
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printf("DO_FORWARD write buffer %p len %d returns %d\n", b, len, l);
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if (l <= 0) break;
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len -= l;
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b += l;
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}
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if (lock) if (pthread_mutex_unlock(&f->lock)) abort();
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}
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}
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static void *forward_s_to_sc(void *_f)
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{
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forward_data *f = _f;
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do_forward(f, f->s, f->sc, 0);
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return NULL;
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}
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static void *forward_sc_to_s(void *_f)
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{
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forward_data *f = _f;
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do_forward(f, f->sc, f->s, 1);
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printf("INFO: forwarder exits\n");
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return NULL;
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}
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void forward_start_client(void *_f, int s)
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{
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forward_data *f = _f;
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f->sc = s;
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new_thread(forward_s_to_sc, f);
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new_thread(forward_sc_to_s, f);
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}
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void *forwarder(char *ip, int port)
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{
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forward_data *f;
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struct sockaddr_in a;
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f = malloc(sizeof(*f)); if (f == NULL) abort();
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pthread_mutex_init(&f->lock, NULL);
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pthread_mutex_init(&f->datalock, NULL);
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pthread_cond_init(&f->datacond, NULL);
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f->sc = -1;
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f->head = f->tail = NULL;
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f->s = socket(AF_INET, SOCK_STREAM, 0);
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if (f->s == -1) { perror("socket"); exit(1); }
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a.sin_family = AF_INET;
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a.sin_port = htons(port);
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a.sin_addr.s_addr = inet_addr(ip);
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if (connect(f->s, (struct sockaddr *)&a, sizeof(a)) == -1)
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{ perror("connect"); exit(1); }
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new_thread(data_sender, f);
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return f;
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}
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void forward(void *_forwarder, char *buf, int size)
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{
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forward_data *f = _forwarder;
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databuf *new;
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new = malloc(sizeof(*new)); if (new == NULL) abort();
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if (pthread_mutex_lock(&f->datalock)) abort();
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new->d = malloc(size); if (new->d == NULL) abort();
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memcpy(new->d, buf, size);
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new->l = size;
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new->next = NULL;
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if (f->head == NULL) f->head = new;
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f->tail = new;
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if (pthread_cond_signal(&f->datacond)) abort();
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if (pthread_mutex_unlock(&f->datalock)) abort();
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}
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