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annotate playground/main.c @ 18:fa2b8af609d9

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[Seobeo] Fixed a bug with pathing. Support SSL.
author June Park <parkjune1995@gmail.com>
date Mon, 06 Oct 2025 08:21:34 -0700
parents d97ec3ded2ae
children 342726584be2
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18
fa2b8af609d9 [Seobeo] Fixed a bug with pathing. Support SSL.
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diff changeset
1 #include <stdio.h>
fa2b8af609d9 [Seobeo] Fixed a bug with pathing. Support SSL.
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2 #include <stdlib.h>
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3 #include <string.h>
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4 #include <unistd.h>
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5 #include <fcntl.h>
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6 #include <errno.h>
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7 #include <netdb.h>
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8 #include <arpa/inet.h>
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9 #include <openssl/ssl.h>
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10 #include <openssl/err.h>
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12 #define INITIAL_BUFFER_CAPACITY 8192
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13
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14 void init_openssl()
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15 {
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16 SSL_load_error_strings();
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17 OpenSSL_add_ssl_algorithms();
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18 }
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19
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20 int main(void)
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21 {
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22 const char *host = "www.google.com";
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23 const char *port = "443";
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25 struct addrinfo hints = {0}, *res;
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26 hints.ai_family = AF_UNSPEC;
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27 hints.ai_socktype = SOCK_STREAM;
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28
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29 if (getaddrinfo(host, port, &hints, &res) != 0)
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30 {
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31 perror("getaddrinfo");
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32 return 1;
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33 }
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34
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35 int sockfd = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
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36 if (sockfd < 0)
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37 {
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38 perror("socket");
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39 return 1;
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40 }
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41
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42 if (connect(sockfd, res->ai_addr, res->ai_addrlen) != 0)
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43 {
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44 perror("connect");
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45 return 1;
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46 }
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47
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48 freeaddrinfo(res);
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49
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50 init_openssl();
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51 SSL_CTX *ctx = SSL_CTX_new(TLS_client_method());
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52 SSL_CTX_set_default_verify_paths(ctx);
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53
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54 SSL *ssl = SSL_new(ctx);
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55 SSL_set_fd(ssl, sockfd);
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56
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57 // ✅ use real hostname for SNI
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58 SSL_set_tlsext_host_name(ssl, host);
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59
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60 // ✅ perform blocking handshake for simplicity
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61 fcntl(sockfd, F_SETFL, 0);
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62
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63 if (SSL_connect(ssl) != 1)
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64 {
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65 fprintf(stderr, "SSL_connect failed\n");
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66 ERR_print_errors_fp(stderr);
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67 return 1;
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68 }
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69
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70 printf("✅ SSL handshake successful!\n");
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72 // send a basic HTTP request
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73 const char *req =
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74 "GET / HTTP/1.1\r\n"
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75 "Host: www.google.com\r\n"
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76 "Connection: close\r\n\r\n";
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77 SSL_write(ssl, req, strlen(req));
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78
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79 char buf[INITIAL_BUFFER_CAPACITY];
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80 int bytes;
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81
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82 while ((bytes = SSL_read(ssl, buf, sizeof(buf) - 1)) > 0)
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83 {
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84 buf[bytes] = '\0';
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85 printf("%s", buf);
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86 }
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87
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88 SSL_shutdown(ssl);
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89 SSL_free(ssl);
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90 SSL_CTX_free(ctx);
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91 close(sockfd);
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92 EVP_cleanup();
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93 return 0;
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94 }