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Working TCP echo

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This commit is contained in:
Quentin Dufour 2019-03-11 11:25:34 +01:00
parent ca140c675e
commit 76f11a2def
1 changed files with 52 additions and 19 deletions
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71
src/tor_echo.c
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@ -5,8 +5,9 @@
#include "tor_ctl.h"
#include "evt_core.h"
#include "net_tools.h"
#include "url.h"
void create_onion_services(struct tor_os_str* tos, struct tor_ctl* tctl, uint16_t* ports, int ports_count) {
void te_create_onion_services(struct tor_os_str* tos, struct tor_ctl* tctl, uint16_t* ports, int ports_count) {
tor_os_create (tos, "onion_services.pub", "onion_services.txt", ports_count);
tor_os_read (tos);
@ -23,24 +24,54 @@ void create_onion_services(struct tor_os_str* tos, struct tor_ctl* tctl, uint16_
}
}
int on_tcp(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdinfo) {
int te_on_tcp_co(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdinfo) {
int conn_sock1, conn_sock2;
struct sockaddr_in addr;
socklen_t in_len;
char url[1024], port[6];
struct evt_core_cat local_cat = {0};
struct evt_core_fdinfo to_fdinfo = {0};
to_fdinfo.cat = &local_cat;
to_fdinfo.url = url;
in_len = sizeof(addr);
conn_sock1 = accept(fdinfo->fd, (struct sockaddr*)&addr, &in_len);
if (conn_sock1 == -1) goto co_error;
url_get_port(port, fdinfo->url);
to_fdinfo.fd = conn_sock1;
to_fdinfo.cat->name = "tcp-all";
sprintf(to_fdinfo.url, "tcp:all:127.0.0.1:%s", port);
evt_core_add_fd (ctx, &to_fdinfo);
return 1;
co_error:
perror("Failed to handle new connection");
exit(EXIT_FAILURE);
}
int te_on_tcp(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdinfo) {
char buffer[1500];
ssize_t nread, nwritten;
struct sockaddr_in addr;
socklen_t addrlen = sizeof(addr);
nread = recvfrom(fdinfo->fd, buffer, sizeof(buffer), MSG_TRUNC, (struct sockaddr*)&addr, &addrlen);
nread = recv(fdinfo->fd, buffer, sizeof(buffer), 0);
if (nread == -1 && errno == EAGAIN) return 1; // Read done
if (nread <= 0 || nread > sizeof(buffer)) {
if (nread == 0) { fprintf(stderr, "WARN! Read 0 bytes.\n"); return 1; }
if (nread < 0 || nread > sizeof(buffer)) {
fprintf(stderr, "Message is either truncated or an error occured. nread=%ld\n", nread);
perror("read errno");
exit(EXIT_FAILURE);
}
nwritten = sendto(fdinfo->fd, buffer, nread, 0, (struct sockaddr*)&addr, addrlen);
nwritten = send(fdinfo->fd, buffer, nread, 0);
// @FIXME don't support EAGAIN on write. Could be intended, you don't think so?
if (nwritten != nread) {
fprintf(stderr, "Didn't write the same number of bytes as read. nread=%ld, nwritten=%ld\n", nread, nwritten);
fprintf(stderr, "Didn't write the same number of bytes as read - not supported. nread=%ld, nwritten=%ld\n", nread, nwritten);
perror("write errno");
exit(EXIT_FAILURE);
}
@ -51,30 +82,31 @@ int main(int argc, char** argv) {
setvbuf(stdout, NULL, _IONBF, 0);
printf("~ torecho ~\n");
int tcp_serv_sock = 0;
int tcp_serv_sock = 0, err;
struct evt_core_ctx evts = {0};
uint16_t ports = {7500};
int port_count = sizeof(ports[0]) / sizeof(ports);
uint16_t ports[] = {7500};
int ports_count = sizeof(ports[0]) / sizeof(ports);
struct tor_os_str tos;
struct tor_ctl tctl;
char url[1024];
// 1. Register categories
struct evt_core_cat tcp_co = {
.app_ctx = NULL,
.free_app_ctx = NULL,
.cb = on_tcp_co,
.cb = te_on_tcp_co,
.err_cb = NULL,
.name = "tcp-all",
.name = "tcp-co",
.flags = EPOLLIN,
.socklist = NULL
};
struct evt_core_cat tcp_all = {
.app_ctx = NULL,
.free_app_ctx = NULL,
.cb = on_tcp,
.cb = te_on_tcp,
.err_cb = NULL,
.name = "tcp-all",
.flags = EPOLLIN | EPOLLOUT | EPOLLET,
.flags = EPOLLIN | EPOLLOUT | EPOLLET | EPOLLRDHUP,
.socklist = NULL
};
evt_core_init(&evts);
@ -83,21 +115,22 @@ int main(int argc, char** argv) {
printf("--- Categories created\n");
// 2. Create or load onion services
create_onion_services (&tos, &tctl, ports, ports_count);
te_create_onion_services (&tos, &tctl, ports, ports_count);
printf("--- Onion services created\n");
// 3. Create TCP server
tcp_serv_sock = create_tcp_server ("127.0.0.1", ports[0]);
sprintf(url, "%d", ports[0]);
tcp_serv_sock = create_tcp_server ("0.0.0.0", url);
err = listen(tcp_serv_sock, SOMAXCONN);
char url[1024];
struct evt_core_cat cat = {0};
struct evt_core_fdinfo fdinfo = {0};
fdinfo.cat = &cat;
fdinfo.url = url;
fdinfo.fd = udp_sock;
sprintf(url, "tcp:all:127.0.0.1:%s", port);
fdinfo.cat->name = "tcp-all";
fdinfo.fd = tcp_serv_sock;
sprintf(url, "tcp:co:127.0.0.1:%d", ports[0]);
fdinfo.cat->name = "tcp-co";
evt_core_add_fd(&evts, &fdinfo);
printf("--- TCP server is listening\n");