1 | /***************************************************************************
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2 | Name: getpage.c
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3 | Autor: www.c-worker.ch
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4 | Beschreibung: Zeigt die Antwort des Webservers auf eine bestimmte URL an
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5 | oder lädt wahlweise die Site in eine Datei herunter.
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6 | Return Code: 0 = ok, >0 oder <0 = Fehler
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7 |
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8 | ----------------------------------------------------------------------------
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9 | Aus RFC 1945, HTTP/1.0:
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10 | Full-Response = Status-Line
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11 | *( General-Header
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12 | | Response-Header
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13 | | Entity-Header )
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14 | CRLF (ich gehe in diesem Code davon aus es handelt sich um \x0D\x0A\x0D\x0A)
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15 | [ Entity-Body ]
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16 |
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17 | ****************************************************************************/
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18 |
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19 | #include <windows.h>
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20 | #include <winsock2.h>
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21 | #include <stdio.h>
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22 | #include <stdlib.h>
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23 |
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24 | void perr_exit(char* msg, int ret_code)
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25 | {
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26 | printf("%s, Error: ",msg);
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27 | printf("%d\n",ret_code);
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28 | exit(ret_code);
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29 | }
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30 |
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31 | void usage(char* prgname)
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32 | {
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33 | printf("\nUsage:\t");
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34 | printf("%s <URL> [<File>]\n",prgname);
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35 | printf("\tURL: Website URL\n");
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36 | printf("\tFile: Optional File to store the Website\n");
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37 | exit(0);
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38 | }
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39 |
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40 | int main(int argc, char** argv)
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41 | {
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42 | char* url;
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43 | char* site;
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44 | char* host;
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45 | char buf[1024];
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46 | char send_buf[256];
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47 | char recv_buf[256];
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48 | long rc;
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49 | FILE* target_file;
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50 | char uses_file=0;
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51 | char* write_ptr;
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52 | SOCKET s;
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53 | SOCKADDR_IN addr;
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54 | WSADATA wsa;
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55 | HOSTENT* hent;
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56 |
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57 | if(WSAStartup(MAKEWORD(2,0),&wsa))
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58 | perr_exit("WSAStartup failed",WSAGetLastError());
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59 |
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60 | addr.sin_family=AF_INET;
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61 | addr.sin_port=htons(80);
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62 |
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63 | if(argc<2)
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64 | {
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65 | printf("\nURL: ");
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66 | scanf("%s",buf);
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67 | url=buf;
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68 | }
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69 | else
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70 | {
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71 | if(strcmp(argv[1],"/?")==0 ||
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72 | strcmp(argv[1],"/help")==0 ||
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73 | strcmp(argv[1],"/h")==0 ||
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74 | strcmp(argv[1],"--help")==0 ||
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75 | strcmp(argv[1],"-h")==0)
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76 | usage(argv[0]);
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77 |
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78 | url=argv[1];
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79 | }
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80 | if(argc>2)
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81 | {
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82 | if(!(target_file=fopen(argv[2],"w")))
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83 | {
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84 | printf("Cannot open File ");
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85 | perr_exit(argv[2],GetLastError());
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86 | }
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87 | uses_file=1;
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88 | }
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89 |
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90 | if(strncmp("http://",url,7)==0)
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91 | host=url+7;
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92 | else
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93 | host=url;
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94 |
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95 | if((site=strchr(host,'/'))!=0)
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96 | *site++='\0';
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97 | else
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98 | site=host+strlen(host); /* \0 */
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99 |
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100 | printf("Host: %s\n",host);
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101 | printf("Site: %s\n",site);
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102 | printf("Connecting....\n");
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103 |
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104 | if((addr.sin_addr.s_addr=inet_addr(host))==INADDR_NONE)
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105 | {
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106 | if(!(hent=gethostbyname(host)))
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107 | perr_exit("Cannot resolve Host",WSAGetLastError());
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108 |
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109 | strncpy((char*)&addr.sin_addr.s_addr,hent->h_addr,4);
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110 |
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111 | if(addr.sin_addr.s_addr==INADDR_NONE)
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112 | perr_exit("Cannot resolve Host",WSAGetLastError());
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113 | }
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114 |
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115 | if((s=socket(AF_INET,SOCK_STREAM,0))==INVALID_SOCKET)
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116 | perr_exit("Cannot create Socket",WSAGetLastError());
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117 |
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118 | if( connect(s,(SOCKADDR*)&addr,sizeof(SOCKADDR)))
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119 | perr_exit("Cannot connect",WSAGetLastError());
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120 |
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121 | printf("Connected to %s...\n",host);
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122 |
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123 |
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124 | sprintf(send_buf,"GET /%s HTTP/1.0\r\n\r\n",site);
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125 |
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126 | // sprintf(send_buf,"GET /%s HTTP/1.0\nUser-Agent:www.google.com\n\n",site);
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127 |
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128 | if((send(s,send_buf,strlen(send_buf),0))<strlen(send_buf))
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129 | perr_exit("Cannot send Data",WSAGetLastError());
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130 |
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131 | if(uses_file)
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132 | printf("Downloading Page to File %s...",argv[2]);
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133 | else
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134 | printf("----Result----\n");
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135 |
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136 | while((rc=recv(s,recv_buf,255,0))>0)
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137 | {
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138 | recv_buf[rc]='\0';
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139 | if(uses_file)
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140 | {
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141 | if(uses_file==1)
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142 | {
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143 | /* web server info nicht in Datei speichern */
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144 | if((write_ptr=strstr(recv_buf,"\x0D\x0A\x0D\x0A"))>0)
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145 | {
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146 | uses_file=2;
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147 | write_ptr+=4;
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148 | }
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149 | }
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150 | else
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151 | write_ptr=recv_buf;
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152 | if(uses_file==2)
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153 | {
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154 | if( fwrite(write_ptr,1, rc-(write_ptr-recv_buf), target_file)<rc-(write_ptr-recv_buf))
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155 | fclose(target_file);
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156 | }
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157 | }
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158 | else /* uses_file */
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159 | printf("%s",recv_buf);
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160 | }
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161 |
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162 | printf("\nDONE!");
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163 | if(uses_file)
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164 | fclose(target_file);
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165 | closesocket(s);
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166 | return 0;
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167 | }
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