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annotate seobeo/s_linux_network.c @ 3:2758f5527d2b

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[Seobeo] Working on simple TCP server and client logic.
author June Park <parkjune1995@gmail.com>
date Wed, 24 Sep 2025 18:49:09 -0700
parents adcfad6e86fb
children 0b3b4f5887bb
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1
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1 #include "seobeo/seobeo.h"
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2
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3 int Seobeo_CreateSocket(int32 stream, char* port, int32 backlog)
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4 {
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5 int32 sock_fd;
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6 struct addrinfo hints, *server_infos, *free_server_info;
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7 int32 yes = 1; // Need this for setsockopt
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8
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9 memset(&hints, 0, sizeof(hints));
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10 if (stream)
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11 {
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12 hints.ai_family = AF_INET;
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13 hints.ai_socktype = SOCK_STREAM;
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14 hints.ai_protocol = IPPROTO_TCP;
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15 hints.ai_flags = AI_PASSIVE;
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16 }
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17 else
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18 {
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19 hints.ai_family = AF_INET;
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20 hints.ai_socktype = SOCK_DGRAM;
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21 hints.ai_protocol = IPPROTO_UDP;
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22 hints.ai_flags = AI_PASSIVE;
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23 }
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24
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25
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26 if (getaddrinfo(NULL, port, &hints, &server_infos) != 0)
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27 {
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28 perror("getaddrinfo");
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29 return -1;
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30 }
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31
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32 for
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33 (
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34 free_server_info = server_infos;
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35 free_server_info != NULL;
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36 free_server_info = free_server_info->ai_next
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37 )
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38 {
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39 if
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40 (
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41 (sock_fd = socket(
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42 free_server_info->ai_family, free_server_info->ai_socktype,
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43 free_server_info->ai_protocol
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44 )) == -1
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45 )
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46 {
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47 perror("socket");
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48 continue;
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49 }
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50
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51 if (setsockopt(sock_fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) == -1)
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52 {
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53 perror("setsockopt");
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54 continue;
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55 }
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56
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57 if (bind(sock_fd, free_server_info->ai_addr, free_server_info->ai_addrlen) == -1)
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58 {
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59 close(sock_fd);
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60 perror("setsockopt");
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61 continue;
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62 }
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63
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64 // UDP should be non blocking
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65 if(!stream)
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66 {
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67 if (fcntl(sock_fd, F_SETFL, O_NONBLOCK) != 0)
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68 {
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69 close(sock_fd);
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70 perror("v_network: Couldn't make socket non-blocking\n");
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71 return -1;
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72 }
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73 }
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74
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75 // binded to a open server infos;
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76 break;
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77 }
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78
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79 // No longer need these values
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80 freeaddrinfo(server_infos);
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81
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82 if (free_server_info == NULL)
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83 {
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84 perror("No free server");
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85 return -1;
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86 }
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87
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88 // TCP listen
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89 if(stream)
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90 {
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91 if (listen(sock_fd, backlog) != 0)
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92 {
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93 perror("listen");
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94 return -1;
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95 }
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96 }
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97
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98 return sock_fd;
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99 }
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100
3
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101
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102 void Seobeo_ListenClient(int sock_fd, void (*handle_client)(int))
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103 {
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104 int32 client_fd;
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105 struct sockaddr_storage client_addr;
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106 socklen_t sin_size;
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107
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108 char client_inet_addr[INET6_ADDRSTRLEN];
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109
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110 while (1)
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111 {
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112 sin_size = sizeof(client_addr);
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113 client_fd = accept(sock_fd, (struct sockaddr *)&client_addr, &sin_size);
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114
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115 if (client_fd == -1)
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116 {
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117 perror("accept");
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118 break;
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119 }
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120
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121 inet_ntop(
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122 client_addr.ss_family,
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123 Seobeo_GetIP4OrIP6((struct sockaddr *)&client_addr),
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124 client_inet_addr, sizeof client_inet_addr);
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125
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126 printf("server: got connection from %s\n", client_inet_addr);
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127
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128 // Create a child process
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129 if (!fork())
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130 {
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131 close(sock_fd);
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132 handle_client(client_fd);
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133 exit(0);
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134 }
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135
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136 close(client_fd);
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137 }
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138 }
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139
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140 void *Seobeo_GetIP4OrIP6(struct sockaddr *sa)
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141 {
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142 if (sa->sa_family == AF_INET)
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143 {
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144 return &(((struct sockaddr_in*)sa)->sin_addr);
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145 }
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146
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147 return &(((struct sockaddr_in6*)sa)->sin6_addr);
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148 }