Re: SSL_read() hang after read http 100 continue headers

[Gait Boxman]

Looks like your code is impatient. When you get continue, 4 retries won't be enough to get the next response. Basically, if you get an SSL_ERROR_WANT_READ, you just need to keep continuing to retry the SSL_read, if you expect more data that is. So, if you expect a server response, keep trying till you get some (you may want to hack in a timeout there), then process the response. If it's a continue, discard it and just start again reading till you get some... ----- Original Message ----- From: Lin Ma To: '[EMAIL PROTECTED]' Cc: Lin Ma Sent: Wednesday, October 30, 2002 11:17 PM Subject: SSL_read() hang after read http 100 continue headers Hi, My program is using OpenSSL function SSL_read() to read http content. It works fine for most of the headers, but after it receives HTTP/1.1 100 Continue header (the first block of headers), it will hang there. It should continue to read the headers (which is HTTP/1.1 200 OK...). The following is the header dumping and the code I used. The http equivalent code works fine. After the first block of headers, it should continually read the 2nd block of headers.   Is it because after the first block of header (see the following), the terminators  0d 0a 0d 0a confused SSL_read? or the terminators are the same as SSL block terminator? How can I get around it?   This is the first block of headers HTTP/1.1 100 Continue Server: Microsoft-IIS/5.0 Date:Wed, 30 Oct 2002 06:34:56 GMT   Can you help me? Thank you. while (Retries <= 4 ) { len = strlen(buf);         printf("before SSL_read(), buf len=%d\n", len); r=SSL_read(Connect->ssl,buf,100); err = SSL_get_error(Connect->ssl, r); printf("r=%d, err=%d\n", r, err); if (err == SSL_ERROR_NONE)     bytes = r; if (err != SSL_ERROR_NONE && err != SSL_ERROR_WANT_READ && err == SSL_ERROR_ZERO_RETURN) { printf(" SSL_ERROR_ZERO_RETURN\n"); break; } if (err != SSL_ERROR_NONE && err != SSL_ERROR_WANT_READ && err == SSL_ERROR_SYSCALL) { printf(" SSL_ERROR_SYSCALL\n"); break; } if (err != SSL_ERROR_NONE && err != SSL_ERROR_WANT_READ && err != SSL_ERROR_SYSCALL && err != SSL_ERROR_ZERO_RETURN) { printf("Reading header, SSL read problem\n"); break; } if (bytes < 0 && Control->AGW==1) { printf("read returned -1 (Error %d), returning ...\n", errno); break; } else if (bytes == 0) { Retries++; } else if (bytes > 0) { buf[bytes] = '\0'; printf("read %d bytes, buf={%s}\n", bytes, buf); } } 0x00000000 | 48 54 54 50 2f 31 2e 31 20 31 30 30 20 43 6f 6e |HTTP/1.1 100 Con 0x00000010 | 74 69 6e 75 65 0d 0a 53 65 72 76 65 72 3a 20 4d |tinue..Server: M 0x00000020 | 69 63 72 6f 73 6f 66 74 2d 49 49 53 2f 35 2e 30 |icrosoft-IIS/5.0 0x00000030 | 0d 0a 44 61 74 65 3a 20 57 65 64 2c 20 33 30 20 | ..Date:Wed, 30 0x00000040 | 4f 63 74 20 32 30 30 32 20 30 36 3a 33 34 3a 35 | Oct 2002 06:34:5 0x00000050 | 36 20 47 4d 54 0d 0a 0d 0a                      | 6 GMT.... 0x00000000 | 48 54 54 50 2f 31 2e 31 20 32 30 30 20 4f 4b 0d |HTTP/1.1 200 OK. 0x00000010 | 0a 53 65 72 76 65 72 3a 20 4d 69 63 72 6f 73 6f |.Server: Microso 0x00000020 | 66 74 2d 49 49 53 2f 35 2e 30 0d 0a 44 61 74 65 |ft-IIS/5.0..Date 0x00000030 | 3a 20 57 65 64 2c 20 33 30 20 4f 63 74 20 32 30 | : Wed,30 Oct 20 0x00000040 | 30 32 20 30 36 3a 33 35 3a 30 37 20 47 4d 54 0d | 02 06:35:07 GMT. 0x00000050 | 0a 43 6f 6e 74 65 6e 74 2d 4c 65 6e 67 74 68 3a |.Content-Length: 0x00000060 | 20 31 38 36 33 0d 0a 43 6f 6e 74 65 6e 74 2d 54 |1863..Content-T 0x00000070 | 79 70 65 3a 20 74 65 78 74 2f 68 74 6d 6c 0d 0a | ype:text/html.. 0x00000080 | 45 78 70 69 72 65 73 3a 20 57 65 64 2c 20 33 30 |Expires: Wed, 30 0x00000090 | 20 4f 63 74 20 32 30 30 32 20 30 36 3a 33 35 3a |  Oct 2002 06:35: 0x000000a0 | 30 37 20 47 4d 54 0d 0a 43 61 63 68 65 2d 63 6f | 07 GMT..Cache-co 0x000000b0 | 6e 74 72 6f 6c 3a 20 70 72 69 76 61 74 65 0d 0a | ntrol: private..