9 #include <sys/socket.h>
12 static int kftp_get_response(knetFile *ftp)
17 while (read(ftp->ctrl_fd, &c, 1)) { // FIXME: this is *VERY BAD* for unbuffered I/O
19 if (n >= ftp->max_response) {
20 ftp->max_response = ftp->max_response? ftp->max_response<<1 : 256;
21 ftp->response = realloc(ftp->response, ftp->max_response);
23 ftp->response[n++] = c;
25 if (n >= 4 && isdigit(ftp->response[0]) && isdigit(ftp->response[1]) && isdigit(ftp->response[2]) && ftp->response[3] != '-') break;
31 ftp->response[n-2] = 0;
32 return strtol(ftp->response, &p, 0);
35 static int kftp_send_cmd(knetFile *ftp, const char *cmd, int is_get)
37 write(ftp->ctrl_fd, cmd, strlen(cmd));
38 return is_get? kftp_get_response(ftp) : 0;
41 static int kftp_pasv_prep(knetFile *ftp)
45 kftp_send_cmd(ftp, "PASV\r\n", 1);
46 for (p = ftp->response; *p && *p != '('; ++p);
47 if (*p != '(') return -1;
49 sscanf(p, "%d,%d,%d,%d,%d,%d", &v[0], &v[1], &v[2], &v[3], &v[4], &v[5]);
50 memcpy(ftp->pasv_ip, v, 4 * sizeof(int));
51 ftp->pasv_port = (v[4]<<8&0xff00) + v[5];
55 static int kftp_pasv_connect(knetFile *ftp)
57 #define __err_pasv_connect(func) do { perror(func); freeaddrinfo(res); return -1; } while (0)
59 struct addrinfo hints, *res;
60 struct linger lng = { 0, 0 };
62 char host[80], port[10];
64 if (ftp->pasv_port == 0) {
65 fprintf(stderr, "[kftp_pasv_connect] kftp_pasv_prep() is not called before hand.\n");
68 memset(&hints, 0, sizeof(struct addrinfo));
69 hints.ai_family = AF_UNSPEC;
70 hints.ai_socktype = SOCK_STREAM;
71 sprintf(host, "%d.%d.%d.%d", ftp->pasv_ip[0], ftp->pasv_ip[1], ftp->pasv_ip[2], ftp->pasv_ip[3]);
72 sprintf(port, "%d", ftp->pasv_port);
73 if (getaddrinfo(host, port, &hints, &res) != 0) { perror("getaddrinfo"); return -1; }
74 if ((ftp->fd = socket(res->ai_family, res->ai_socktype, res->ai_protocol)) == -1) __err_pasv_connect("socket");
75 if (setsockopt(ftp->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) __err_pasv_connect("setsockopt");
76 if (setsockopt(ftp->fd, SOL_SOCKET, SO_LINGER, &lng, sizeof(lng)) == -1) __err_pasv_connect("setsockopt");
77 if (connect(ftp->fd, res->ai_addr, res->ai_addrlen) != 0) __err_pasv_connect("connect");
82 int kftp_connect(knetFile *ftp)
84 #define __err_connect(func) do { perror(func); return -1; } while (0)
88 struct addrinfo hints, *res;
89 memset(&hints, 0, sizeof(struct addrinfo));
90 hints.ai_family = AF_UNSPEC;
91 hints.ai_socktype = SOCK_STREAM;
92 if (getaddrinfo(ftp->host, "21", &hints, &res) != 0) __err_connect("getaddrinfo");
93 if ((ftp->ctrl_fd = socket(res->ai_family, res->ai_socktype, res->ai_protocol)) == -1) __err_connect("socket");
94 if (setsockopt(ftp->ctrl_fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) __err_connect("setsockopt");
95 if (connect(ftp->ctrl_fd, res->ai_addr, res->ai_addrlen) != 0) __err_connect("connect");
97 kftp_get_response(ftp);
100 kftp_send_cmd(ftp, "USER anonymous\r\n", 1);
101 kftp_send_cmd(ftp, "PASS kftp@\r\n", 1);
102 kftp_send_cmd(ftp, "TYPE I\r\n", 1);
107 int kftp_reconnect(knetFile *ftp)
114 return kftp_connect(ftp);
117 // initialize ->type, ->host and ->retr
118 knetFile *kftp_prep(const char *fn, const char *mode)
123 if (strstr(fn, "ftp://") != fn) return 0;
124 for (p = (char*)fn + 6; *p && *p != '/'; ++p);
125 if (*p != '/') return 0;
127 fp = calloc(1, sizeof(knetFile));
128 fp->type = KNF_TYPE_FTP;
129 fp->host = calloc(l + 1, 1);
130 if (strchr(mode, 'c')) fp->no_reconnect = 1;
131 strncpy(fp->host, fn + 6, l);
132 fp->retr = calloc(strlen(p) + 7, 1);
133 sprintf(fp->retr, "RETR %s\r\n", p);
136 // place ->fd at offset off
137 int kftp_connect_file(knetFile *fp, off_t off)
141 if (fp->no_reconnect) kftp_get_response(fp);
146 sprintf(tmp, "REST %lld\r\n", (long long)off);
147 kftp_send_cmd(fp, tmp, 1);
149 kftp_send_cmd(fp, fp->retr, 0);
150 kftp_pasv_connect(fp);
151 kftp_get_response(fp);
156 knetFile *knet_open(const char *fn, const char *mode)
159 if (mode[0] != 'r') {
160 fprintf(stderr, "[kftp_open] only mode \"r\" is supported.\n");
163 if (strstr(fn, "ftp://") == fn) {
164 fp = kftp_prep(fn, mode);
165 if (fp == 0) return 0;
166 if (kftp_connect(fp) == -1) {
170 kftp_connect_file(fp, 0);
172 int fd = open(fn, O_RDONLY);
177 fp = (knetFile*)calloc(1, sizeof(knetFile));
178 fp->type = KNF_TYPE_LOCAL;
184 off_t knet_read(knetFile *fp, void *buf, off_t len)
186 off_t l = read(fp->fd, buf, len);
191 off_t knet_seek(knetFile *fp, off_t off, int whence)
193 if (fp->type == KNF_TYPE_LOCAL) {
194 fp->offset = lseek(fp->fd, off, whence);
197 if (fp->type == KNF_TYPE_FTP) {
198 if (whence != SEEK_SET) {
199 fprintf(stderr, "[knet_seek] only SEEK_SET is supported for FTP. Offset is unchanged.\n");
202 if (!fp->no_reconnect) kftp_reconnect(fp);
203 kftp_connect_file(fp, off);
209 int knet_close(knetFile *fp)
211 if (fp == 0) return 0;
212 if (fp->ctrl_fd > 0) close(fp->ctrl_fd);
213 if (fp->fd > 0) close(fp->fd);
214 free(fp->response); free(fp->retr); free(fp->host);
224 // fp = knet_open("ftp://ftp.ncbi.nih.gov/1000genomes/ftp/data/NA12878/alignment/NA12878.chrom6.SLX.SRP000032.2009_06.bam", "r"); knet_seek(fp, 2500000000ll, SEEK_SET);
225 // fp = knet_open("ftp://ftp.sanger.ac.uk/pub4/treefam/tmp/index.shtml", "r"); knet_seek(fp, 2000, SEEK_SET);
226 fp = knet_open("knetfile.c", "r"); knet_seek(fp, 2000, SEEK_SET);
227 knet_read(fp, buf, 255);