pop2.c
上传用户:xxcykj
上传日期:2007-01-04
资源大小:727k
文件大小:4k
- /*
- * pop2.c -- POP2 protocol methods
- *
- * Copyright 1997 by Eric S. Raymond
- * For license terms, see the file COPYING in this directory.
- */
- #include "config.h"
- #ifdef POP2_ENABLE
- #include <stdio.h>
- #if defined(STDC_HEADERS)
- #include <stdlib.h>
- #endif
- #include "fetchmail.h"
- #include "socket.h"
- static int pound_arg, equal_arg;
- int pop2_ok (int sock, char *argbuf)
- /* parse POP2 command response */
- {
- int ok;
- char buf [POPBUFSIZE+1];
- pound_arg = equal_arg = -1;
- if ((ok = gen_recv(sock, buf, sizeof(buf))) == 0)
- {
- if (buf[0] == '+')
- ok = 0;
- else if (buf[0] == '#')
- {
- pound_arg = atoi(buf+1);
- ok = 0;
- }
- else if (buf[0] == '=')
- {
- equal_arg = atoi(buf+1);
- ok = 0;
- }
- else if (buf[0] == '-')
- ok = PS_ERROR;
- else
- ok = PS_PROTOCOL;
- if (argbuf != NULL)
- strcpy(argbuf,buf);
- }
- return(ok);
- }
- int pop2_getauth(int sock, struct query *ctl, char *buf)
- /* apply for connection authorization */
- {
- return(gen_transact(sock,
- "HELO %s %s",
- ctl->remotename, ctl->password));
- }
- static int pop2_getrange(int sock, struct query *ctl, const char *folder,
- int *countp, int *newp, int *bytes)
- /* get range of messages to be fetched */
- {
- /* maybe the user wanted a non-default folder */
- if (folder)
- {
- int ok = gen_transact(sock, "FOLD %s", folder);
- if (ok != 0)
- return(ok);
- if (pound_arg == -1)
- return(PS_ERROR);
- }
- else
- /*
- * We should have picked up a count of messages in the user's
- * default inbox from the pop2_getauth() response.
- *
- * Note: this logic only works because there is no way to select
- * both the unnamed folder and named folders within a single
- * fetchmail run. If that assumption ever becomes invalid, the
- * pop2_getauth code will have to stash the pound response away
- * explicitly in case it gets stepped on.
- */
- if (pound_arg == -1)
- return(PS_ERROR);
- *countp = pound_arg;
- *bytes = *newp = -1;
- return(0);
- }
- static int pop2_fetch(int sock, struct query *ctl, int number, int *lenp)
- /* request nth message */
- {
- int ok;
- *lenp = 0;
- ok = gen_transact(sock, "READ %d", number);
- if (ok)
- return(0);
- *lenp = equal_arg;
- gen_send(sock, "RETR");
- return(ok);
- }
- static int pop2_trail(int sock, struct query *ctl, int number)
- /* send acknowledgement for message data */
- {
- return(gen_transact(sock, ctl->keep ? "ACKS" : "ACKD"));
- }
- static int pop2_logout(int sock, struct query *ctl)
- /* send logout command */
- {
- return(gen_transact(sock, "QUIT"));
- }
- const static struct method pop2 =
- {
- "POP2", /* Post Office Protocol v2 */
- #if INET6_ENABLE
- "pop2", /* standard POP2 port */
- "pop2", /* ssl POP2 port */
- #else /* INET6_ENABLE */
- 109, /* standard POP2 port */
- 109, /* ssl POP2 port - not */
- #endif /* INET6_ENABLE */
- FALSE, /* this is not a tagged protocol */
- FALSE, /* does not use message delimiter */
- pop2_ok, /* parse command response */
- NULL, /* no password canonicalization */
- pop2_getauth, /* get authorization */
- pop2_getrange, /* query range of messages */
- NULL, /* no way to get sizes */
- NULL, /* messages are always new */
- pop2_fetch, /* request given message */
- NULL, /* no way to fetch body alone */
- pop2_trail, /* eat message trailer */
- NULL, /* no POP2 delete method */
- pop2_logout, /* log out, we're done */
- FALSE, /* no, we can't re-poll */
- };
- int doPOP2 (struct query *ctl)
- /* retrieve messages using POP2 */
- {
- peek_capable = FALSE;
- return(do_protocol(ctl, &pop2));
- }
- #endif /* POP2_ENABLE */
- /* pop2.c ends here */