不属于的随机字节，SSL_read

Question

我正在获得随机字节来领导每个SSL_read的缓冲区中的内容

char *getJSON(char *url) {
int sock, length, bytes, https = 0;                         
struct sockaddr_in server;
char *json = NULL, buffer[4096], command[200], *hostname = malloc(100);
size_t size;

char *q = url, *r = malloc(100), *s = hostname;
if(q[4] == 's')
    https = 1;
int k = 0, j = 0, i = https ? 8 : 7;
for(; q[i] != '/'; i++, j++)
    s[j] = q[i];
for(; q[i] != '\0'; i++, k++)   
    r[k] = q[i];
r[k] = '\0';
s[j] = '\0';

struct hostent *host;
if((host = gethostbyname(hostname)) == NULL) {
    printf("gethostbyname() failed\n");
    return NULL;
}

memset(&server, 0, sizeof(server));
server.sin_family = AF_INET;
server.sin_addr = *((struct in_addr *)host->h_addr);
server.sin_port = htons(https ? 443 : 80);
bzero(&(server.sin_zero), 8);

sprintf(command, "GET %s HTTP/1.1\r\nHost: %s\r\n\r\n", r, hostname);

if((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
    perror("socket: ");
    return NULL;
}

struct timeval tv;
tv.tv_sec = 5;
tv.tv_usec = 0;
setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, (char *)&tv,sizeof(struct timeval));

if(connect(sock, (struct sockaddr *)&server, sizeof(server)) < 0) {
    perror("connect: ");
    free(hostname);
    free(r);
    return NULL;
}
length = strlen(command);
if(!https) {
    if(send(sock, command, length, 0) != length) {
        printf("send fail\n");
        close(sock);
        free(hostname);
        free(r);
        return NULL;
    }

    size = 0;
    while((bytes = recv(sock, buffer, sizeof(buffer), 0)) > 0) {
        size += bytes;
        json = realloc(json, size + 1);
        memcpy(json + size - bytes, buffer, bytes);
    }
    if(json != NULL)
        json[size] = '\0';

    close(sock);
    free(hostname);
    free(r);
}
else {
    int status;
    SSL_CTX *ctx = NULL;
    SSL *session = NULL;
    SSL_METHOD *method;

    SSL_library_init();
    SSL_load_error_strings();
    OpenSSL_add_all_algorithms();
    method = SSLv3_client_method();
    ctx = SSL_CTX_new(method);
  if(ctx == NULL) {
        printf("ctx: %s\n", ERR_error_string(ERR_get_error(), NULL));
        close(sock);
        free(hostname);
        free(r);
        return NULL;
    }
  session = SSL_new(ctx);
  if(session == NULL) {
        printf("session: %s\n", ERR_error_string(ERR_get_error(), NULL));
        SSL_CTX_free(ctx);
        close(sock);
        free(hostname);
        free(r);
        return NULL;
    }
  if(!SSL_set_fd(session, sock)) {
        printf("set_fd: %s\n", ERR_error_string(ERR_get_error(), NULL));
        SSL_free(session);
        SSL_CTX_free(ctx);
        close(sock);
        free(hostname);
        free(r);
        return NULL;
    }
  if(SSL_connect(session) != 1) {
        printf("ssl_connect: %s\n", ERR_error_string(ERR_get_error(), NULL));
        SSL_free(session);
        SSL_CTX_free(ctx);
        close(sock);
        free(hostname);
        free(r);
        return NULL;
    }

    SSL_write(session, command, length);
    sleep(1);

    size = 0;
    while((bytes = SSL_read(session, buffer, sizeof(buffer))) > 0) {
        json = realloc(json, size + bytes + 1);
        memcpy(json + size, buffer, bytes);
        size += bytes;
    }
    if(json != NULL)
        json[size] = '\0';

    SSL_shutdown(session);
    close(sock);
    free(hostname);
    free(r);

    SSL_free(session);
    SSL_CTX_free(ctx);
}

i = 0;
while(json[i] != '{' && i < size)
    i++;
if(i == size -1)
    json = NULL;
else {
    char *temp = malloc(size - i + 2);
    strncpy(temp, json + i, size - i + 1);
    free(json);
    json = temp;
}

return json;
}

感兴趣的区域以粗体显示的问题样本：

“ UNO / POT”：{“ last_trade”：“ 1000.00000000”，“ last_sell”：“ 1000.00000000”，“ last_buy”：“ 1000.00000000”，“ current_ask”：“ 4000.00000000”，“ current_ask_volume”：“ 1.00000000”，“ current_bid” ：“ 291.00000000”，“ current_bid_volume”：“ 2.00000000”，“ highest_24h”：“”，“ lowest_24h”：“”，“ volume_base_24h”：“ 0”}，“ USDE / BTC”：{“ last_trade”：“ 0.00000040” ，“ last_sell”：“ 0.00000040”，“ last_buy”：“ 0.00000040”，“ current_ask”：“ 0.00000041”，“ current_ask_volume”：“ 100.00000000”，“ current_bid”：“ 0.00000039”，“ current_bid_volume”：“ 350000.00000000”，“ maximum_24h“：” 0.00000058“，” lowest_24h“：” 0.00000036“，” volume_base_24h“：” 0.63630518“}，” USDE / DOGE“：{” last_trade“：” 0.30000000“，” last_sell“：” 0.30000000“，” last_buy“ ：“ 0.00000000”，“ current_ask”：“ 0.40000000”，“ current_ask_volume”：“ 1000.00000000”，“ current_bid”：“ 0.20000000”，“ current_bid_volume”：“ 600.00000000”，“ highest_24h”：“ 0.30000000”，“ lowest_24h”：“ 0.00000001”，“ volume_base_24h”：“ 150.00004453”}，“ USDE / LTC”：{“ last_trade”：“ 0.00001400”，“ last_sell”：“ 0。 00001400”，“ last_buy”：“ 0.00001500”，“ current_ask”：“ 0.00006699”，“ current_ask_volume”：“ 999.02392380”，“ current_bid”：“ 0.00001400”，“ current_bid_volume”：“ 6545.30401900”，“ highest_24h”：“ 0.00002000” ，“ lowest_24h”：“ 0.00001400”，“ volume_base_24h”：“ 0.13267596”}， “ U a3b TC / BTC” ：{“ last_trade”：“ 0.00017500”，“ last_sell”：“ 0.00017500”，“ last_buy”：“ 0.00020001” ，“ current_ask”：“ 0.00020001”，“ current_ask_volume”：“ 159.31100000”，“ current_bid”：“ 0.00018000”，“ current_bid_volume”：“ 404.44538889”，“ highest_24h”：“ 0.00025794”，“ lowest_24h”：“ 0.00015200”，“ volume_base_24h“：” 2.03433487“}，” UTC / DOGE“：{” last_trade“：” 0.00017500“，” last_sell“：” 0.00000000“，” last_buy“：” 0.00000000“，” current_ask“：” 100000.00000000“，” current_ask_volume“ ：“ 7.57259300”，“ current_bid”：“ 1.00000011”，“ current_bid_volume”：“ 50.00000000”，“ highest_24h”：“”，“ lowest_24h”：“”，“ volume_base_24h”：“ 0”}，“ UTC / LTC”： {“ last_trade”：“ 0.01600000”，“ last_sell”：“ 0.01580000”，“ last_buy”：“ 0.01600000”，“ current_ask”：“ 0.01490000”，“ cur rent_ask_volume“：” 50.11762200“，” current_bid“：” 0.00001101“，” current_bid_volume“：” 1283.55681200“，” highest_24h“：” 0.01600000“，” lowest_24h“：” 0.01600000“，” volume_base_24h“：” 0.04516711“}，” VDC / BTC“：{” last_trade“：” 0.00000010“，” last_sell“：” 0.00000012“，” last_buy“：” 0.00000010“，” current_ask“：” 0.00000026“，” current_ask_volume“：” 26918.98003600“，” current_bid“：” 0.00000005“，” current_bid_volume“：” 100000.00000000“，” highest_24h“：” 0.00000028“，” lowest_24h“：” 0.00000010“，” volume_base_24h“：” 0.02909542“}，” VDC / LTC“：{” last_trade“：” 0.00000100“ ，“ last_sell”：“ 0.00000100”，“ last_buy”：“ 0.00000300”，“ current_ask”：“ 0.00000600”，“ current_ask_volume”：“ 1249.60000000”，“ current_bid”：“ 0.00000100”，“ current_bid_volume”：“ 2181786.00000000”，“ maximum_24h“：”“，” lowest_24h“：”“，” volume_base_24h“：” 0“}，” VMP / BTC“：{” last_trade“：” 0.00002610“，” last_sell“：” 0.00002610“，” last_buy“：” 0.00003200”，“ current_ask”：“ 0.00005000”，“ current_ask_volume”：“ 66.00000000”，“ current_bid”：“ 0.00002610”，“ current _bid_volume“：” 26.00464672“，” highest_24h“：” 0.00005000“，” lowest_24h“：” 0.00002610“，” volume_base_24h“：” 0.04879532“}，” VMP / DOGE“：{” last_trade“：” 33.00000000“，” last_sell“ ：“ 10.00000000”，“ last_buy”：“ 33.00000000”，“ current_ask”：“ 33.00000000”，“ current_ask_volume”：“ 300.00000000”，“ current_bid”：“ 0.00000006”，“ current_bid_volume”：“ 20000000.00000000”，“ highest_24h”：“ “，” lowest_24h“：”“，” volume_base_24h“：” 0“}，” VMP / POT“：{” last_trade“：” 0.00548000“，” last_sell“：” 0.00548000“，” last_buy“：” 0.00000000“，” current_ask“：” 33.00000000“，” current_ask_volume“：” 300.00000000“，” current_bid“：” 0.00549000“，” current_bid_volume“：” 100.00000000“，” highest_24h“：”“，” lowest_24h“：”“，” volume_base_24h“：” 0“}， ” VO 5a8 LT / BTC“ ：{” last_trade“：” 0.00000002“，” last_sell“：” 0.00000002“，” last_buy“：” 0.00000003“，” current_ask“：” 0.00000003“，” current_ask_volume“：” 115696031.91739591“，” current_bid“：” 0.00000002“，” current_bid_volume“：” 200707569.17978617“，” highest_24h“：” 0.00000003“，” lowest_24h“：” 0.0000 0002“，” volume_base_24h“：” 0.97345629“}，

Answer 1

那些“随机字节”是HTTP分块编码使用的十六进制内容长度指示符。