302.htm

unix高级编程原吗

        //NOTE: I have changed Content-Length to ength because <br>
        //      people have notified me that some servers don't <br>
        //      capitalize the L in length. <br>
        temp = strstr (buffer, "ength: "); <br>
        if (temp != NULL) <br>
        {       for (i = 0; temp[i + 7] != '\r'; i++) <br>
                        URL->left[i] = temp[i + 7]; <br>
                URL->left [i] = '\0'; <br>
                URL->lleft = atol(URL->left); <br>
                if (URL->lsize == URL->lleft) <br>
                {       printf("Error... I think that you are trying to resu <br>

me aa file that has already been downloaded!\n"); <br>
                        return 0; <br>
                } <br>
                printf("%s bytes left to download!\r\n", URL->left); <br>
                URL->resume = 1; <br>
                URL->lleft -= (bsize-(fin-buffer)); <br>
        } else <br>
        {       printf("Error in web site file size estimation, or unknown s <br>
erveer type\n\n"); <br>
                URL->resume = 0; <br>
                URL->lleft = 2000000000; <br>
        } <br>
        fwrite(fin,bsize-(fin-buffer),1,URL->fp); <br>
        printf("[."); <br>
        fflush(NULL); <br>
        return 1; <br>
} <br>
bool ReadFTPListing (URLp URL) <br>
////////////////////////////////////// <br>
// <br>
// <br>
// <br>
// <br>
////////////////////////////////////// <br>
{       int result = 1; <br>
        int len = 1; <br>
        int i = 0; <br>
        int j = 0; <br>
        int k = 0; <br>
        int listfd = 0; <br>
        int datafd = 0; <br>
        char buffer[64000], buffer2[64000], buffer3[64000], buffer4[64000]; <br>
        char lhost[5][4]; <br>
        char *rbuffer = NULL; <br>
        struct sockaddr_in datastream, liststream; <br>
        URL->resume = 1; <br>
        while(result > 0) <br>
        {       result = read(URL->sockfd, buffer + len - 1, sizeof(buffer) <br>
+ leen - 1); <br>
                len += result; <br>
                if (strstr(buffer, "200") != NULL) <br>
                        result = 0; <br>
        } <br>
        rbuffer = strstr(buffer, "Passive Mode ("); <br>
        if (rbuffer == NULL) <br>

        {       printf("PASV mode not supported, aborting.\n"); <br>
                exit(0); <br>
        } else <br>
        for (i = 14; (unsigned)i < strlen(rbuffer) && rbuffer[i] != ')'; i++ <br>
) <br>
                if (rbuffer[i] == ',') <br>
                {       lhost[j][k] = '\0'; <br>
                        j++; <br>
                        k = 0; <br>
                } else <br>
                lhost[j][k++] = rbuffer[i]; <br>
        listfd = socket(AF_INET, SOCK_STREAM, 0); <br>
        if (listfd == -1) <br>
        {       printf("Error opening socket to FTP server for LIST!\n"); <br>
                return(0); <br>
        } <br>
        liststream.sin_family = AF_INET; <br>
        liststream.sin_port = htons(atoi(lhost[4])*256 + atoi(lhost[5])); <br>
        memcpy(&liststream.sin_addr, URL->host->h_addr, URL->host->h_length) <br>
; <br>
        if (connect(listfd, (struct sockaddr *)&liststream, sizeof(liststrea <br>
m)) == -1) <br>
m)) == -1) <br>
        {       printf("Error connecting to FTP socket for LIST!\n"); <br>
                close(listfd); <br>
                URL->retry = 1; <br>
                return(0); <br>
        } <br>
        result = 1; <br>
        len = 1; <br>
        while(result > 0) <br>
        {       result = read(listfd, buffer2 + len - 1, sizeof(buffer2) + l <br>
en -- 1); <br>
                len += result; <br>
        } <br>
        int whitespace = 0; <br>
        for (j = 0; (unsigned)j < strlen(buffer2) && whitespace < 4; j++) <br>
        {       if (buffer2[j] == ' ' && buffer2[j + 1] != ' ') <br>
                        whitespace ++; <br>
        } <br>
        for (k = 0; (unsigned)j < strlen(buffer2); j++) <br>
                if (buffer2[j] == ' ' || (buffer2[j] > ('0' - 1) && buffer2[ <br>
j] << ('9' + 1))) <br>
                        URL->total[k++] = buffer2[j]; <br>
                else <br>

                        j = strlen(buffer2); <br>
        URL->total[j - 4] = '\0'; <br>
        URL->ltotal = atol(URL->total); <br>
        printf("File size: %lld bytes\n", URL->ltotal); <br>
        close(listfd); <br>
        write(URL->sockfd, "PASV\r\n", 6); <br>
        write(URL->sockfd, "REST 0\r\n", 8); <br>
        write(URL->sockfd, "NOOP\r\n", 6); <br>
        result = 1; <br>
        len = 1; <br>
        while(result > 0) <br>
        {       result = read(URL->sockfd, buffer3 + len - 1, sizeof(buffer3 <br>
) + len - 1); <br>
                len += result; <br>
                if (strstr(buffer3, "200") != NULL) <br>
                        result = 0; <br>
        } <br>
        rbuffer = strstr(buffer3, "Passive Mode ("); <br>
        if (rbuffer == NULL) <br>
                return(0); <br>
        else <br>
                for (i = 14, j = 0, k = 0; (unsigned)i < strlen(rbuffer) && <br>

rbufffer[i] != ')'; i++) <br>
                        if (rbuffer[i] == ',') <br>
                        {       lhost[j][k] = '\0'; <br>
                                j++; <br>
                                k = 0; <br>
                        } <br>
                        else <br>
                        lhost[j][k++] = rbuffer[i]; <br>
        URL->fp = fopen (URL->filename, "a+b"); <br>
        URL->lsize = ftell(URL->fp); <br>
        if (URL->lsize >= URL->ltotal) <br>
        {       printf("Error... It seems this file has already been downloa <br>
ded..\n"); <br>
                return(0); <br>
        } else <br>
        if (URL->fp == NULL) <br>
        {       printf("Error opening file %s\n", URL->filename); <br>
                return(0); <br>
        } else <br>
        if (URL->lsize < rollback) <br>
                URL->lsize = 0; <br>
        else <br>
        else <br>
                URL->lsize -= rollback; <br>
        ftruncate(fileno(URL->fp), URL->lsize); <br>
        sprintf(URL->size, "%lld", URL->lsize); <br>
        printf("Resuming from %s bytes.\n\n", URL->size); <br>
        write(URL->sockfd, "TYPE I\r\n", 8); <br>
        write(URL->sockfd, "REST ", 5); <br>
        write(URL->sockfd, URL->size, strlen(URL->size)); <br>
        write(URL->sockfd, "\r\n", 2); <br>
        dldots = (long long)URL->lsize / rollback; <br>
        write(URL->sockfd, "RETR ", 5); <br>
        write(URL->sockfd, URL->file, strlen(URL->file)); <br>
        write(URL->sockfd, "\r\n", 2); <br>
        datafd = socket(AF_INET, SOCK_STREAM, 0); <br>
        if (datafd == -1) <br>
        {       printf("Error opening socket to FTP server for RETR!\n"); <br>
                URL->retry = 1; <br>
                return(0); <br>
        } <br>
        datastream.sin_family = AF_INET; <br>
        datastream.sin_port = htons(atoi(lhost[4])*256 + atoi(lhost[5])); <br>
        memcpy(&datastream.sin_addr, URL->host->h_addr, URL->host->h_length) <br>
; <br>
; <br>
        if (connect(datafd, (struct sockaddr *)&datastream, sizeof(datastrea <br>
m)) == -1) <br>
        {       printf("Error connecting to FTP socket for RETR!\n"); <br>
                close(datafd); <br>
                URL->retry = 1; <br>
                return(0); <br>
        } <br>
        result = 1; len = 1; <br>
        while(result > 0) <br>
        {       result = read(URL->sockfd, buffer4 + len - 1, sizeof(buffer4 <br>
) + len - 1); <br>
                len += result; <br>
                if (strstr(buffer4, "350") != NULL) <br>
                        result = 0; <br>
        } <br>
        listfd = URL->sockfd; <br>
        URL->sockfd = datafd; <br>
        close (listfd); <br>
        URL->lleft = URL->ltotal - URL->lsize; <br>
        printf("[."); <br>
        return (1); <br>
} <br>
} <br>
void Download(URLp URL) <br>
////////////////////////////////////// <br>
//      void Download(URLp URL) <br>
// <br>
//      Downloads up to 4k of data from URL->sockfd and writes it to URL->fp <br>
  <br>
// <br>
// Pre:  Assigned(URL->sockfd) && Assigned(URL->lleft) && Assigned(URL->fp) <br>
&& UURL->done != 1 <br>
// Post: set URL->done = 1, if finished. <br>
////////////////////////////////////// <br>
{       int bsize = 1; <br>
        char buff[rollback]; <br>
        bsize = read(URL->sockfd, buff, sizeof(buff)); <br>
        URL->lleft = URL->lleft - bsize; <br>
        if (bsize > 0) <br>
                dlstat += bsize; <br>
        fwrite(buff, bsize, 1, URL->fp); <br>
        if (dlstat > rollback - 1) <br>
        {       printf("."); <br>
                dlstat -= rollback; <br>
                fflush(NULL); <br>

                dldots ++; <br>
                if (dldots%50 == 0) <br>
                {       printf("]  -%ldk %.2fk/sec- \n[.", (rollback * dldot <br>
s) // 1024, <br>
                                ((float)((rollback * 50) / 1024)) <br>
                                 / ((float)(time((time_t *)0) - start))); <br>
                        start = time((time_t *)0); <br>
                } <br>
        } <br>
        if ((bsize < 1) || (URL->lleft < 1 && URL->resume)) <br>
        {       if (dldots%50 == 0) <br>
                        printf("] -%ldk %.2fk/sec-\n\nChecking Completion St <br>
atuss...\n", <br>
                                (rollback * dldots)/1024, <br>
                                ((float)((rollback * 1) / 1024)) / <br>
                                 ((float)(time((time_t *)0) - start))); <br>
                else <br>
                        printf("] -%ldk %.2fk/sec-\n\nChecking Completion St <br>
atuss...\n", <br>
                                (rollback * dldots)/1024, <br>
                                ((float)((rollback * (dldots%50)) / 1024)) / <br>
  <br>
  <br>
                                 ((float)(time((time_t *)0) - start))); <br>
                close(URL->sockfd); <br>
                fclose(URL->fp); <br>
                URL->done = 1; <br>
                printf("%s Done!\n\n", URL->filename); <br>
        } <br>
} <br>
int main (int argc, char *argv[]) <br>
////////////////////////////////////// <br>
// <br>
// <br>
// <br>
// <br>
////////////////////////////////////// <br>
{       URLp URL = &URLst; <br>
        int i; <br>
        printf("%s  [Get and Resume Elite EDition] - By Anoakie Turner\r\n", <br>
 CURRRENT_VERSION); <br>
        for (i = 1; i < argc; i ++) <br>
                if (argv[i][0] == '-') <br>
                {       if (argv[i][1] == 'n' || argv[i][1] == 'N') <br>
                        {       argv[i] = GGR; <br>

                        } else <br>
                        {       printf("\n\nUSEAGE: greed URL(1) URL(2) ... <br>
URL((N)\n"); <br>
                                printf("i.e.: greed %s ftp://some.where/out/ <br>
therre.tar.gz\n", GGR); <br>
                                exit(0); <br>
                        } <br>
                } <br>
        for (i = 1; i < argc; i ++) <br>
        {       strcpy(URL->name, argv[i]); <br>
                if (Parse(URL)) <br>
                if (Connect(URL)) <br>
                if ((URL->protocol == HTTP && ReadHTTPHeader(URL)) || <br>
                    (URL->protocol == FTP && ReadFTPListing(URL))) <br>
                {       start = time((time_t *)0); <br>
                        while (!URL->done) <br>
                                Download(URL); <br>
                } <br>
                close (URL->sockfd); <br>
                if (URL->retry == 1) <br>
                {       URL->retry = 0; <br>
                        i--; <br>

                        printf("Retrying in 5 seconds...\n"); <br>
                        sleep(5); <br>
                } <br>
        } <br>
        return(EXIT_SUCCESS); <br>
} <br>
  <br>
-- <br>
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