Added client, fixed typo

client.c

@@ -0,0 +1,140 @@
+#include "client.h"
+
+#include <stdio.h>
+#include <string.h>
+
+#include <endian.h>
+#include <errno.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <sys/epoll.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+#include "connection.h"
+#include "event_loop.h"
+#include "utils.h"
+
+/*
+ * Macros
+ */
+#define MAX_PENDING_CONNECTIONS         (100)
+
+/*
+ * Data
+ */
+static int _fds[MAX_PENDING_CONNECTIONS];
+
+
+/*
+ * Public API
+ */
+bool client_init() {
+    for (int i = 0; i < MAX_PENDING_CONNECTIONS; ++i) {
+        _fds[i] = -1;
+    }
+    return true;
+}
+
+void client_deinit() {
+    for (int i = 0; i < MAX_PENDING_CONNECTIONS; ++i) {
+        if (_fds[i] == -1) {
+            continue;
+        }
+        shutdown(_fds[i], SHUT_RDWR);
+        close(_fds[i]);
+    }
+}
+
+bool client_connect(const char *host, uint16_t port) {
+    int index = -1;
+    for (int i = 0; i < MAX_PENDING_CONNECTIONS; ++i) {
+        if (_fds[i] == -1) {
+            index = i;
+            break;
+        }
+    }
+    if (index == -1) {
+        fprintf(stderr, "[!] no more space for new connect attempts\n");
+        return false;
+    }
+    struct hostent *he = gethostbyname(host);
+    if (!he) {
+        fprintf(stderr, "[!] gethostbyname (%s) failed: %d (h_errno)\n", host,  h_errno);
+        return false;
+    }
+    int fd = socket(
+        AF_INET,
+        SOCK_STREAM | SOCK_NONBLOCK,
+        IPPROTO_TCP
+    );
+    if (fd == -1) {
+        fprintf(stderr, "[!] socket failed: %d\n", errno);
+        return false;
+    }
+    struct sockaddr_in addr;
+    addr.sin_family = AF_INET;
+    addr.sin_port = htobe16(port);
+    memcpy(&addr.sin_addr, he->h_addr, he->h_length);
+    int res = connect(fd, (const struct sockaddr *)&addr, sizeof(addr));
+    if (res == -1) {
+        if (errno != EINPROGRESS) {
+            fprintf(stderr, "[!] connect failed: %d\n", errno);
+            return false;
+        }
+        else {
+            _fds[index] = fd;
+            struct epoll_event ev;
+            ev.data.fd = fd;
+            ev.events = EPOLLOUT;
+            loop_ctl(EPOLL_CTL_ADD, fd, &ev);
+            return true;
+        }
+    }
+    uint32_t id = connection_add(fd);
+    if (id == 0) {
+        shutdown(fd, SHUT_RDWR);
+        close(fd);
+        return false;
+    }
+    return true;
+}
+
+bool client_event(int fd, uint32_t events) {
+    int index = -1;
+    for (int i = 0; i < MAX_PENDING_CONNECTIONS; ++i) {
+        if (_fds[i] == fd) {
+            index = i;
+            break;
+        }
+    }
+    if (index == -1) {
+        return false;
+    }
+    if (events & (EPOLLERR | EPOLLHUP)) {
+        shutdown(fd, SHUT_RDWR);
+        close(fd);
+        _fds[index] = -1;
+        fprintf(stderr, "[!] connect failed\n");
+        return true;
+    }
+    // check if socket has an error set
+    int err = 0;
+    socklen_t len = sizeof(err);
+    if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &err, &len) < 0 || err != 0) {
+        shutdown(fd, SHUT_RDWR);
+        close(fd);
+        _fds[index] = -1;
+        fprintf(stderr, "[!] connect failed: %d\n", err);
+        return true;
+    }
+    // connected
+    loop_ctl(EPOLL_CTL_DEL, fd, NULL);
+    uint32_t id = connection_add(fd);
+    if (id == 0) {
+        shutdown(fd, SHUT_RDWR);
+        close(fd);
+    }
+    _fds[index] = -1;
+    return true;
+}