Tiny SMTP Client
Dependencies: EthernetNetIf mbed
Diff: TinySMTP.cpp
- Revision:
- 0:7440c9b170aa
- Child:
- 1:05064fe7ea1e
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/TinySMTP.cpp Wed Jul 27 15:09:04 2011 +0000 @@ -0,0 +1,195 @@ +/* + * mbed Tiny SMTP Client + * Copyright (c) 2011 Hiroshi Suga + * Released under the MIT License: http://mbed.org/license/mit + */ + +/** @file + * @brief Tiny SMTP Client + */ + +#include "mbed.h" +#include "EthernetNetIf.h" +#include "TCPSocket.h" +#include "DNSRequest.h" +#include "TinySMTP.h" + +#define STATUS_NONE 0 +#define STATUS_READABLE 1 +#define STATUS_CONNECTED 2 +#define STATUS_ERROR 3 +#define STATUS_DISCONNECTED 4 + +TCPSocket *smtp; +volatile int tcp_status = 0, dns_status = 0; + + +// Copyright (c) 2010 Donatien Garnier (donatiengar [at] gmail [dot] com) +int base64enc(const char *input, unsigned int length, char *output, int outputlen) { + static const char base64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; + unsigned int c, c1, c2, c3; + + if (outputlen < (((length-1)/3)+1)<<2) return -1; + + for(unsigned int i = 0, j = 0; i<length; i+=3,j+=4) { + c1 = ((((unsigned char)*((unsigned char *)&input[i])))); + c2 = (length>i+1)?((((unsigned char)*((unsigned char *)&input[i+1])))):0; + c3 = (length>i+2)?((((unsigned char)*((unsigned char *)&input[i+2])))):0; + + c = ((c1 & 0xFC) >> 2); + output[j+0] = base64[c]; + c = ((c1 & 0x03) << 4) | ((c2 & 0xF0) >> 4); + output[j+1] = base64[c]; + c = ((c2 & 0x0F) << 2) | ((c3 & 0xC0) >> 6); + output[j+2] = (length>i+1)?base64[c]:'='; + c = (c3 & 0x3F); + output[j+3] = (length>i+2)?base64[c]:'='; + } + output[(((length-1)/3)+1)<<2] = '\0'; + return 0; +} + + +void isr_smtp (TCPSocketEvent e) { + +#ifdef DEBUG + printf("tcp(%d)\r\n", e); +#endif + switch(e) { + case TCPSOCKET_READABLE: //Incoming data + tcp_status = STATUS_READABLE; + break; + + case TCPSOCKET_CONNECTED: + case TCPSOCKET_WRITEABLE: //We can send data + tcp_status = STATUS_CONNECTED; + break; + + case TCPSOCKET_CONTIMEOUT: + case TCPSOCKET_CONRST: + case TCPSOCKET_CONABRT: + case TCPSOCKET_ERROR: + tcp_status = STATUS_ERROR; + break; + + case TCPSOCKET_DISCONNECTED: + tcp_status = STATUS_DISCONNECTED; + break; + } +} + +int wait_smtp (int code) { + int i; + char buf[700]; + + // wait responce + for (i = 0; i < SMTP_TIMEOUT / 10; i ++) { + if (tcp_status != STATUS_CONNECTED) break; + Net::poll(); + wait_ms(10); + } + if (tcp_status != STATUS_READABLE) return -1; + tcp_status = STATUS_CONNECTED; + // recv + i = smtp->recv(buf, sizeof(buf)); + buf[i] = 0; +#ifdef DEBUG + printf(buf); +#endif + + // check return code + if (atoi(buf) == code) return 0; + + return -1; +} + +void isr_dns (DNSReply r) { + + if (DNS_FOUND) { + dns_status = 1; + } else { + dns_status = -1; + } +} + +int sendmail (char *to, char *from, char *data, Host *host, char *user, char *pwd) { + TCPSocketErr err; + int i, ret = -1; + + smtp = new TCPSocket; + tcp_status = STATUS_NONE; + + smtp->setOnEvent(isr_smtp); + + // connect + if (host->getIp().isNull()) { + DNSRequest dns; + dns_status = 0; + dns.setOnReply(isr_dns); + if (dns.resolve(host) != DNS_OK) goto exit; + for (i = 0; i < SMTP_TIMEOUT / 10; i ++) { + if (dns_status) break; + Net::poll(); + wait_ms(10); + } + while (dns_status < 0) goto exit; + } + err = smtp->connect(*host); + if (err != TCPSOCKET_OK) goto exit; + + // wait connect + for (i = 0; i < 1500; i ++) { + if (tcp_status != STATUS_NONE) break; + Net::poll(); + wait_ms(10); + } + if (wait_smtp(220)) goto exit; + + // send request + wait_ms(100); + smtp->send("EHLO mbed\r\n", 11); + if (wait_smtp(250)) goto exit; + + if (user && pwd) { + // smtp auth + char tmp[80], buf[100]; + int len; + snprintf(tmp, sizeof(tmp), "%s%c%s%c%s", user, 0, user, 0, pwd); + len = strlen(user) * 2 + strlen(pwd) + 2; + base64enc(tmp, len, buf, sizeof(buf)); + smtp->send("AUTH PLAIN ", 11); + smtp->send(buf, strlen(buf)); + smtp->send("\r\n", 2); + if (wait_smtp(235)) goto quit; + } + + smtp->send("MAIL FROM: ", 11); + smtp->send(from, strlen(from)); + smtp->send("\r\n", 2); + if (wait_smtp(250)) goto quit; + + smtp->send("RCPT TO: ", 9); + smtp->send(to, strlen(to)); + smtp->send("\r\n", 2); + if (wait_smtp(250)) goto quit; + + smtp->send("DATA\r\n", 6); + if (wait_smtp(354)) goto quit; + + // mail data + smtp->send(data, strlen(data)); + smtp->send("\r\n.\r\n", 5); + if (wait_smtp(250)) goto quit; + ret = 0; + +quit: + smtp->send("QUIT\r\n", 6); + if (wait_smtp(221)) goto exit; + +exit: + smtp->resetOnEvent(); + smtp->close(); + delete smtp; + + return ret; +}